The Vitamin C 13 Serum
A gentle, water-based vitamin C serum with 13% pure ascorbic acid that brightens skin, fades dark spots, and improves overall complexion. Formulated with Super Vitamin E (Tocotrienol) and Hyaluronic Acid for enhanced antioxidant protection and hydration. Perfect for vitamin C beginners and sensitive skin types seeking daily brightening without irritation.
โจ Texture & Feel
Brightening Power
13% pure ascorbic acid targets hyperpigmentation, dark spots, and uneven skin tone for a radiant complexion.
Super Antioxidant Protection
Tocotrienol (Super Vitamin E) provides up to 50x more antioxidant power than regular Vitamin E to fight free radical damage.
Deep Hydration
Hyaluronic Acid and Allantoin deliver moisture deep into skin layers while soothing and preventing irritation.
Multi-Vitamin Complex
Contains Niacinamide, Panthenol, and Glutathione for enhanced brightening, barrier support, and anti-aging benefits.
๐ก๏ธ Safety & Compatibility
Vitamin C (ascorbic acid) is considered safe during pregnancy and breastfeeding. No retinoids, hydroquinone, or high-concentration salicylic acid present.
Contains Squalane and Elaeis Guineensis (Palm) Oil which may feed malassezia in some individuals. Patch test recommended if prone to fungal acne.
Rating 1/5. Lightweight, water-based formula with minimal pore-clogging ingredients. Suitable for most acne-prone skin types.
Clinically tested as non-irritating on 30 subjects over 24 hours. Fragrance-free and formulated for daily use on sensitive skin.
๐ฌ Ingredient Breakdown
๐ Ascorbic Acid (Pure Vitamin C) 13% Proven
The gold-standard form of Vitamin C, L-ascorbic acid directly penetrates skin to inhibit melanin production, boost collagen synthesis, and neutralize free radicals for brighter, firmer skin.
- Brightening: Inhibits tyrosinase enzyme to reduce melanin production and fade existing dark spots
- Anti-Aging: Stimulates collagen synthesis and protects existing collagen from degradation
- Antioxidant: Neutralizes UV-induced free radicals to prevent photoaging
๐ฟ 3-O-Ethyl Ascorbic Acid Supporting Proven
A stable, water-soluble derivative of Vitamin C that converts to pure ascorbic acid in the skin. Provides extended brightening benefits without the irritation potential of L-ascorbic acid.
- Stability: Resists oxidation better than pure ascorbic acid for longer shelf life
- Penetration: Slowly releases Vitamin C deep into skin layers for prolonged effects
- Gentle: Less irritating than pure Vitamin C, suitable for sensitive skin
๐พ Tocotrienol (Super Vitamin E) Supporting Proven
A superior form of Vitamin E with up to 50 times greater antioxidant efficacy than regular tocopherol. Enhances Vitamin C stability and provides powerful anti-aging benefits.
- Synergy: Stabilizes and regenerates Vitamin C, enhancing its effectiveness
- Anti-Aging: Prevents oxidative damage to cell membranes and reduces wrinkle formation
- Protection: Shields skin from UV damage and environmental stressors
๐ง Sodium Hyaluronate Supporting Proven
Low molecular weight hyaluronic acid that penetrates deep into skin to attract and retain moisture, plumping skin and reducing the appearance of fine lines.
- Hydration: Holds up to 1000x its weight in water for intense moisture retention
- Plumping: Reduces appearance of fine lines by hydrating from within
- Barrier Support: Strengthens skin's moisture barrier function
โจ Niacinamide (Vitamin B3) Supporting Proven
A multi-functional powerhouse that brightens skin, minimizes pores, strengthens the skin barrier, and works synergistically with Vitamin C for enhanced results.
- Brightening: Inhibits melanin transfer to reduce hyperpigmentation
- Pore Refining: Regulates sebum production and minimizes enlarged pores
- Barrier Repair: Increases ceramide synthesis for stronger, healthier skin
๐งช Glutathione Supporting Promising
The body's master antioxidant that supports skin brightening and provides cellular protection against oxidative stress.
- Brightening: Inhibits melanin production for a more even skin tone
- Antioxidant: Regenerates other antioxidants including Vitamins C and E
- Detoxification: Helps neutralize harmful compounds and protect cells
25 ingredients
Water, Ascorbic Acid(13%), Butylene Glycol, Dipropylene Glycol, Tromethamine, 3-0-Ethyl Ascorbic Acid, Panthenol, Acetyl Glucosamine, Caffeine, Sodium Hyaluronate, Sodium Sulfite, Disodium EDTA, Glutathione, Adenosine, Gardenia Florida Fruit Extract, Allantoin, Dextrin, Squalane, Tocotrienols, Tocopherol, Elaeis Guineensis (Palm) Oil, Arginine, Niacinamide, Pentylene Glycol, Glycyrrhiza Glabra (Licorice) Root Extract
๐ Where It Fits in Your Routine
Apply after toner on clean skin. Wait 1-2 minutes before layering other products. Always follow with SPF 30+ sunscreen in the morning.
๐ How to Use
Shake Gently
Shake the bottle 1-2 times from side to side before each use to ensure ingredients are well-mixed.
Dispense 2-3 Drops
After cleansing and toning, apply 2-3 drops onto fingertips. A little goes a long way with this concentrated formula.
Gently Massage
Starting from the center of your face, gently pat and massage the serum outward toward the edges. Avoid direct eye contact.
Wait & Layer
Allow 1-2 minutes for absorption before applying next skincare steps. Follow with moisturizer and SPF 30+ sunscreen in the morning.
๐ค Who Is It For?
โ Perfect for you if:
- You're new to Vitamin C serums and want a gentle introduction
- You have hyperpigmentation, dark spots, or uneven skin tone
- Your skin looks dull and lacks radiance
- You want anti-aging benefits without harsh irritation
- You have sensitive skin that reacts to stronger actives
- You're looking for an affordable, effective K-beauty brightening serum
- You want to prevent early signs of aging
โ Consider alternatives if:
- You're experienced with Vitamin C and need higher concentrations (try COSRX 23%)
- You have severe hyperpigmentation requiring prescription-strength treatments
- You cannot store products in the refrigerator
- You're prone to fungal acne (malassezia folliculitis)
- You prefer oil-based or anhydrous Vitamin C formulations
- You want a larger bottle size for longer-term use
๐ฏ Skin Type Compatibility
Lightweight, water-based formula absorbs quickly without adding shine or greasiness. Helps brighten post-acne marks.
Contains Hyaluronic Acid for hydration, but dry skin types may need a richer moisturizer on top for optimal comfort.
Balances well across different face zones. Light enough for oily T-zone while still providing hydration for dry areas.
Clinically tested as non-irritating. 13% concentration is gentle yet effective. Fragrance-free formula minimizes reaction risk.
Low comedogenic rating (1/5). Great for fading post-inflammatory hyperpigmentation. Contains Niacinamide for pore care.
Boosts collagen production, improves elasticity, and reduces fine lines. Adenosine provides additional anti-wrinkle benefits.
๐ Results Timeline
Immediate Radiance
Skin appears brighter and more hydrated. The lightweight formula absorbs quickly, leaving a subtle glow. Some users may experience mild tingling initially as skin adjusts.
85% noticed improved radianceVisible Brightening
Noticeable improvement in overall skin tone. Dark spots begin to fade. Clinical trials show 3.94% improvement in brightness after 4 weeks of use.
78% saw brighter skin toneDark Spot Fading
Significant reduction in hyperpigmentation and post-acne marks. Skin texture becomes smoother. Clinical results show 31.92% improvement in redness.
72% noticed faded dark spotsAnti-Aging Benefits
Improved elasticity and reduced fine lines become visible. Clinical trials demonstrate 10.64% improvement in wrinkles around the eye area and 36.97% reduction in pore volume.
65% reported firmer skinโญ Ratings by Platform
โ๏ธ Pros & Cons
โ Praised
- Effective brightening results for dark spots and hyperpigmentation
- Gentle formula suitable for sensitive skin and vitamin C beginners
- Lightweight, fast-absorbing texture without stickiness
- Affordable compared to high-end vitamin C serums
- Contains multiple beneficial ingredients (Vitamin E, HA, Niacinamide)
- Fragrance-free and clinically tested for irritation
- Visible results in 2-4 weeks of consistent use
โ Criticized
- Small bottle size (20ml) depletes quickly with daily use
- Requires refrigeration to prevent oxidation
- Short shelf life once opened (6 months)
- Natural coppery/metallic vitamin C scent
- May not be potent enough for experienced vitamin C users
- Dropper can be messy with watery formula
- Not fungal acne safe due to certain oils
๐ฐ Budget-Friendly Alternatives (Dupes)
Higher concentration (23%) in silicone-based suspension. Gritty texture and longer absorption time. More affordable but may be too strong for sensitive skin.
Lower concentration (5%) makes it gentler but slower-acting. Better for very sensitive skin. Larger bottle (35ml) lasts longer. More stable formula.
Higher concentration with stabilizing ferulic acid. Larger bottle (30ml). More potent but may cause more irritation for sensitive skin types.
Same formula but with 23% vitamin C concentration. Better for experienced users who need stronger results. Not recommended for vitamin C beginners.
๐ Comparison with Competitors
COSRX Vitamin C 13 Serum (This Product)
~$22SkinCeuticals C E Ferulic
~$182Dear, Klairs Freshly Juiced Vitamin Drop
~$23The Ordinary Vitamin C Suspension 23%
~$6.80๐ฆ Storage & Shelf Life
6 months after opening. Pure vitamin C oxidizes quickly once exposed to air. Use consistently for best results.
Store upright in refrigerator (3-10ยฐC / 37-50ยฐF) to prevent oxidation. Keep away from direct sunlight and heat sources.
Dark glass dropper bottle with specially designed cap to control gas buildup from vitamin C oxidation process.
Yes, under 100ml TSA limit. For travel, keep in insulated bag with ice pack to maintain cool temperature.
โ Frequently Asked Questions
Yes, this serum is generally considered safe during pregnancy and breastfeeding. Vitamin C (ascorbic acid) is a pregnancy-safe ingredient. The formula contains no retinoids, hydroquinone, or high-concentration salicylic acid. However, as with any skincare product, consult your healthcare provider before use during pregnancy or nursing.
Use with caution. The serum contains Squalane and Elaeis Guineensis (Palm) Oil, which may feed malassezia yeast in some individuals prone to fungal acne. If you have a history of fungal acne, perform a patch test first or consider a fungal acne-safe alternative vitamin C serum.
It's best to avoid using vitamin C with retinol, AHA, or BHA in the same routine to prevent irritation. Use vitamin C in the morning and retinol at night. If using acids, alternate days or apply vitamin C in AM and acids in PM. The formula already contains niacinamide, which works synergistically with vitamin C.
This serum is excellent for all skin types, especially sensitive skin and vitamin C beginners. The 13% concentration is effective yet gentle. It's ideal for oily, combination, normal, and sensitive skin. Dry skin types may need additional moisturizer. Those with very experienced skin may prefer the 23% version for stronger results.
Most users notice improved radiance within 1-2 weeks. Visible brightening and dark spot fading typically occurs around weeks 3-4. Clinical trials showed 31.92% improvement in redness and nearly 37% reduction in pore volume after consistent use. Full anti-aging benefits like improved elasticity become apparent after 8-12 weeks of daily use.
Apply after cleansing and toning, before other serums and moisturizer. The order is: Cleanser โ Toner โ Vitamin C Serum โ Essence/Other Serums โ Moisturizer โ Sunscreen (AM). Apply 2-3 drops and wait 1-2 minutes before layering other products. Always follow with SPF 30+ sunscreen in the morning.
No, this serum has a low comedogenic rating of 1/5. The lightweight, water-based formula contains minimal pore-clogging ingredients. It also includes Niacinamide which helps minimize pores and regulate sebum production. It's suitable for most acne-prone skin types, though those with fungal acne should exercise caution.
The serum has a 6-month PAO (Period After Opening) when stored properly in the refrigerator. Pure vitamin C oxidizes when exposed to air, light, and heat. Signs of oxidation include color change from pale yellow to dark orange/brown and a metallic smell. Once oxidized, the serum loses effectiveness and should be discarded.
Verdict: COSRX The Vitamin C 13 Serum is an excellent entry-level vitamin C serum that delivers real brightening results without the irritation commonly associated with pure ascorbic acid. The 13% concentration hits a sweet spot between efficacy and gentleness, making it perfect for vitamin C beginners and sensitive skin types. The addition of Tocotrienol (Super Vitamin E), Hyaluronic Acid, Niacinamide, and Glutathione elevates this beyond a simple vitamin C serum into a multi-functional brightening treatment. While the small bottle size and refrigeration requirement may be drawbacks for some, the affordable price point and clinically-proven results make this a standout choice in the K-beauty brightening category. If you're ready for stronger results, consider graduating to the 23% version.
Original: $696.50
-70%$696.50
$208.95The Vitamin C 13 Serum
A gentle, water-based vitamin C serum with 13% pure ascorbic acid that brightens skin, fades dark spots, and improves overall complexion. Formulated with Super Vitamin E (Tocotrienol) and Hyaluronic Acid for enhanced antioxidant protection and hydration. Perfect for vitamin C beginners and sensitive skin types seeking daily brightening without irritation.
โจ Texture & Feel
Brightening Power
13% pure ascorbic acid targets hyperpigmentation, dark spots, and uneven skin tone for a radiant complexion.
Super Antioxidant Protection
Tocotrienol (Super Vitamin E) provides up to 50x more antioxidant power than regular Vitamin E to fight free radical damage.
Deep Hydration
Hyaluronic Acid and Allantoin deliver moisture deep into skin layers while soothing and preventing irritation.
Multi-Vitamin Complex
Contains Niacinamide, Panthenol, and Glutathione for enhanced brightening, barrier support, and anti-aging benefits.
๐ก๏ธ Safety & Compatibility
Vitamin C (ascorbic acid) is considered safe during pregnancy and breastfeeding. No retinoids, hydroquinone, or high-concentration salicylic acid present.
Contains Squalane and Elaeis Guineensis (Palm) Oil which may feed malassezia in some individuals. Patch test recommended if prone to fungal acne.
Rating 1/5. Lightweight, water-based formula with minimal pore-clogging ingredients. Suitable for most acne-prone skin types.
Clinically tested as non-irritating on 30 subjects over 24 hours. Fragrance-free and formulated for daily use on sensitive skin.
๐ฌ Ingredient Breakdown
๐ Ascorbic Acid (Pure Vitamin C) 13% Proven
The gold-standard form of Vitamin C, L-ascorbic acid directly penetrates skin to inhibit melanin production, boost collagen synthesis, and neutralize free radicals for brighter, firmer skin.
- Brightening: Inhibits tyrosinase enzyme to reduce melanin production and fade existing dark spots
- Anti-Aging: Stimulates collagen synthesis and protects existing collagen from degradation
- Antioxidant: Neutralizes UV-induced free radicals to prevent photoaging
๐ฟ 3-O-Ethyl Ascorbic Acid Supporting Proven
A stable, water-soluble derivative of Vitamin C that converts to pure ascorbic acid in the skin. Provides extended brightening benefits without the irritation potential of L-ascorbic acid.
- Stability: Resists oxidation better than pure ascorbic acid for longer shelf life
- Penetration: Slowly releases Vitamin C deep into skin layers for prolonged effects
- Gentle: Less irritating than pure Vitamin C, suitable for sensitive skin
๐พ Tocotrienol (Super Vitamin E) Supporting Proven
A superior form of Vitamin E with up to 50 times greater antioxidant efficacy than regular tocopherol. Enhances Vitamin C stability and provides powerful anti-aging benefits.
- Synergy: Stabilizes and regenerates Vitamin C, enhancing its effectiveness
- Anti-Aging: Prevents oxidative damage to cell membranes and reduces wrinkle formation
- Protection: Shields skin from UV damage and environmental stressors
๐ง Sodium Hyaluronate Supporting Proven
Low molecular weight hyaluronic acid that penetrates deep into skin to attract and retain moisture, plumping skin and reducing the appearance of fine lines.
- Hydration: Holds up to 1000x its weight in water for intense moisture retention
- Plumping: Reduces appearance of fine lines by hydrating from within
- Barrier Support: Strengthens skin's moisture barrier function
โจ Niacinamide (Vitamin B3) Supporting Proven
A multi-functional powerhouse that brightens skin, minimizes pores, strengthens the skin barrier, and works synergistically with Vitamin C for enhanced results.
- Brightening: Inhibits melanin transfer to reduce hyperpigmentation
- Pore Refining: Regulates sebum production and minimizes enlarged pores
- Barrier Repair: Increases ceramide synthesis for stronger, healthier skin
๐งช Glutathione Supporting Promising
The body's master antioxidant that supports skin brightening and provides cellular protection against oxidative stress.
- Brightening: Inhibits melanin production for a more even skin tone
- Antioxidant: Regenerates other antioxidants including Vitamins C and E
- Detoxification: Helps neutralize harmful compounds and protect cells
25 ingredients
Water, Ascorbic Acid(13%), Butylene Glycol, Dipropylene Glycol, Tromethamine, 3-0-Ethyl Ascorbic Acid, Panthenol, Acetyl Glucosamine, Caffeine, Sodium Hyaluronate, Sodium Sulfite, Disodium EDTA, Glutathione, Adenosine, Gardenia Florida Fruit Extract, Allantoin, Dextrin, Squalane, Tocotrienols, Tocopherol, Elaeis Guineensis (Palm) Oil, Arginine, Niacinamide, Pentylene Glycol, Glycyrrhiza Glabra (Licorice) Root Extract
๐ Where It Fits in Your Routine
Apply after toner on clean skin. Wait 1-2 minutes before layering other products. Always follow with SPF 30+ sunscreen in the morning.
๐ How to Use
Shake Gently
Shake the bottle 1-2 times from side to side before each use to ensure ingredients are well-mixed.
Dispense 2-3 Drops
After cleansing and toning, apply 2-3 drops onto fingertips. A little goes a long way with this concentrated formula.
Gently Massage
Starting from the center of your face, gently pat and massage the serum outward toward the edges. Avoid direct eye contact.
Wait & Layer
Allow 1-2 minutes for absorption before applying next skincare steps. Follow with moisturizer and SPF 30+ sunscreen in the morning.
๐ค Who Is It For?
โ Perfect for you if:
- You're new to Vitamin C serums and want a gentle introduction
- You have hyperpigmentation, dark spots, or uneven skin tone
- Your skin looks dull and lacks radiance
- You want anti-aging benefits without harsh irritation
- You have sensitive skin that reacts to stronger actives
- You're looking for an affordable, effective K-beauty brightening serum
- You want to prevent early signs of aging
โ Consider alternatives if:
- You're experienced with Vitamin C and need higher concentrations (try COSRX 23%)
- You have severe hyperpigmentation requiring prescription-strength treatments
- You cannot store products in the refrigerator
- You're prone to fungal acne (malassezia folliculitis)
- You prefer oil-based or anhydrous Vitamin C formulations
- You want a larger bottle size for longer-term use
๐ฏ Skin Type Compatibility
Lightweight, water-based formula absorbs quickly without adding shine or greasiness. Helps brighten post-acne marks.
Contains Hyaluronic Acid for hydration, but dry skin types may need a richer moisturizer on top for optimal comfort.
Balances well across different face zones. Light enough for oily T-zone while still providing hydration for dry areas.
Clinically tested as non-irritating. 13% concentration is gentle yet effective. Fragrance-free formula minimizes reaction risk.
Low comedogenic rating (1/5). Great for fading post-inflammatory hyperpigmentation. Contains Niacinamide for pore care.
Boosts collagen production, improves elasticity, and reduces fine lines. Adenosine provides additional anti-wrinkle benefits.
๐ Results Timeline
Immediate Radiance
Skin appears brighter and more hydrated. The lightweight formula absorbs quickly, leaving a subtle glow. Some users may experience mild tingling initially as skin adjusts.
85% noticed improved radianceVisible Brightening
Noticeable improvement in overall skin tone. Dark spots begin to fade. Clinical trials show 3.94% improvement in brightness after 4 weeks of use.
78% saw brighter skin toneDark Spot Fading
Significant reduction in hyperpigmentation and post-acne marks. Skin texture becomes smoother. Clinical results show 31.92% improvement in redness.
72% noticed faded dark spotsAnti-Aging Benefits
Improved elasticity and reduced fine lines become visible. Clinical trials demonstrate 10.64% improvement in wrinkles around the eye area and 36.97% reduction in pore volume.
65% reported firmer skinโญ Ratings by Platform
โ๏ธ Pros & Cons
โ Praised
- Effective brightening results for dark spots and hyperpigmentation
- Gentle formula suitable for sensitive skin and vitamin C beginners
- Lightweight, fast-absorbing texture without stickiness
- Affordable compared to high-end vitamin C serums
- Contains multiple beneficial ingredients (Vitamin E, HA, Niacinamide)
- Fragrance-free and clinically tested for irritation
- Visible results in 2-4 weeks of consistent use
โ Criticized
- Small bottle size (20ml) depletes quickly with daily use
- Requires refrigeration to prevent oxidation
- Short shelf life once opened (6 months)
- Natural coppery/metallic vitamin C scent
- May not be potent enough for experienced vitamin C users
- Dropper can be messy with watery formula
- Not fungal acne safe due to certain oils
๐ฐ Budget-Friendly Alternatives (Dupes)
Higher concentration (23%) in silicone-based suspension. Gritty texture and longer absorption time. More affordable but may be too strong for sensitive skin.
Lower concentration (5%) makes it gentler but slower-acting. Better for very sensitive skin. Larger bottle (35ml) lasts longer. More stable formula.
Higher concentration with stabilizing ferulic acid. Larger bottle (30ml). More potent but may cause more irritation for sensitive skin types.
Same formula but with 23% vitamin C concentration. Better for experienced users who need stronger results. Not recommended for vitamin C beginners.
๐ Comparison with Competitors
COSRX Vitamin C 13 Serum (This Product)
~$22SkinCeuticals C E Ferulic
~$182Dear, Klairs Freshly Juiced Vitamin Drop
~$23The Ordinary Vitamin C Suspension 23%
~$6.80๐ฆ Storage & Shelf Life
6 months after opening. Pure vitamin C oxidizes quickly once exposed to air. Use consistently for best results.
Store upright in refrigerator (3-10ยฐC / 37-50ยฐF) to prevent oxidation. Keep away from direct sunlight and heat sources.
Dark glass dropper bottle with specially designed cap to control gas buildup from vitamin C oxidation process.
Yes, under 100ml TSA limit. For travel, keep in insulated bag with ice pack to maintain cool temperature.
โ Frequently Asked Questions
Yes, this serum is generally considered safe during pregnancy and breastfeeding. Vitamin C (ascorbic acid) is a pregnancy-safe ingredient. The formula contains no retinoids, hydroquinone, or high-concentration salicylic acid. However, as with any skincare product, consult your healthcare provider before use during pregnancy or nursing.
Use with caution. The serum contains Squalane and Elaeis Guineensis (Palm) Oil, which may feed malassezia yeast in some individuals prone to fungal acne. If you have a history of fungal acne, perform a patch test first or consider a fungal acne-safe alternative vitamin C serum.
It's best to avoid using vitamin C with retinol, AHA, or BHA in the same routine to prevent irritation. Use vitamin C in the morning and retinol at night. If using acids, alternate days or apply vitamin C in AM and acids in PM. The formula already contains niacinamide, which works synergistically with vitamin C.
This serum is excellent for all skin types, especially sensitive skin and vitamin C beginners. The 13% concentration is effective yet gentle. It's ideal for oily, combination, normal, and sensitive skin. Dry skin types may need additional moisturizer. Those with very experienced skin may prefer the 23% version for stronger results.
Most users notice improved radiance within 1-2 weeks. Visible brightening and dark spot fading typically occurs around weeks 3-4. Clinical trials showed 31.92% improvement in redness and nearly 37% reduction in pore volume after consistent use. Full anti-aging benefits like improved elasticity become apparent after 8-12 weeks of daily use.
Apply after cleansing and toning, before other serums and moisturizer. The order is: Cleanser โ Toner โ Vitamin C Serum โ Essence/Other Serums โ Moisturizer โ Sunscreen (AM). Apply 2-3 drops and wait 1-2 minutes before layering other products. Always follow with SPF 30+ sunscreen in the morning.
No, this serum has a low comedogenic rating of 1/5. The lightweight, water-based formula contains minimal pore-clogging ingredients. It also includes Niacinamide which helps minimize pores and regulate sebum production. It's suitable for most acne-prone skin types, though those with fungal acne should exercise caution.
The serum has a 6-month PAO (Period After Opening) when stored properly in the refrigerator. Pure vitamin C oxidizes when exposed to air, light, and heat. Signs of oxidation include color change from pale yellow to dark orange/brown and a metallic smell. Once oxidized, the serum loses effectiveness and should be discarded.
Verdict: COSRX The Vitamin C 13 Serum is an excellent entry-level vitamin C serum that delivers real brightening results without the irritation commonly associated with pure ascorbic acid. The 13% concentration hits a sweet spot between efficacy and gentleness, making it perfect for vitamin C beginners and sensitive skin types. The addition of Tocotrienol (Super Vitamin E), Hyaluronic Acid, Niacinamide, and Glutathione elevates this beyond a simple vitamin C serum into a multi-functional brightening treatment. While the small bottle size and refrigeration requirement may be drawbacks for some, the affordable price point and clinically-proven results make this a standout choice in the K-beauty brightening category. If you're ready for stronger results, consider graduating to the 23% version.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
A gentle, water-based vitamin C serum with 13% pure ascorbic acid that brightens skin, fades dark spots, and improves overall complexion. Formulated with Super Vitamin E (Tocotrienol) and Hyaluronic Acid for enhanced antioxidant protection and hydration. Perfect for vitamin C beginners and sensitive skin types seeking daily brightening without irritation.
โจ Texture & Feel
Brightening Power
13% pure ascorbic acid targets hyperpigmentation, dark spots, and uneven skin tone for a radiant complexion.
Super Antioxidant Protection
Tocotrienol (Super Vitamin E) provides up to 50x more antioxidant power than regular Vitamin E to fight free radical damage.
Deep Hydration
Hyaluronic Acid and Allantoin deliver moisture deep into skin layers while soothing and preventing irritation.
Multi-Vitamin Complex
Contains Niacinamide, Panthenol, and Glutathione for enhanced brightening, barrier support, and anti-aging benefits.
๐ก๏ธ Safety & Compatibility
Vitamin C (ascorbic acid) is considered safe during pregnancy and breastfeeding. No retinoids, hydroquinone, or high-concentration salicylic acid present.
Contains Squalane and Elaeis Guineensis (Palm) Oil which may feed malassezia in some individuals. Patch test recommended if prone to fungal acne.
Rating 1/5. Lightweight, water-based formula with minimal pore-clogging ingredients. Suitable for most acne-prone skin types.
Clinically tested as non-irritating on 30 subjects over 24 hours. Fragrance-free and formulated for daily use on sensitive skin.
๐ฌ Ingredient Breakdown
๐ Ascorbic Acid (Pure Vitamin C) 13% Proven
The gold-standard form of Vitamin C, L-ascorbic acid directly penetrates skin to inhibit melanin production, boost collagen synthesis, and neutralize free radicals for brighter, firmer skin.
- Brightening: Inhibits tyrosinase enzyme to reduce melanin production and fade existing dark spots
- Anti-Aging: Stimulates collagen synthesis and protects existing collagen from degradation
- Antioxidant: Neutralizes UV-induced free radicals to prevent photoaging
๐ฟ 3-O-Ethyl Ascorbic Acid Supporting Proven
A stable, water-soluble derivative of Vitamin C that converts to pure ascorbic acid in the skin. Provides extended brightening benefits without the irritation potential of L-ascorbic acid.
- Stability: Resists oxidation better than pure ascorbic acid for longer shelf life
- Penetration: Slowly releases Vitamin C deep into skin layers for prolonged effects
- Gentle: Less irritating than pure Vitamin C, suitable for sensitive skin
๐พ Tocotrienol (Super Vitamin E) Supporting Proven
A superior form of Vitamin E with up to 50 times greater antioxidant efficacy than regular tocopherol. Enhances Vitamin C stability and provides powerful anti-aging benefits.
- Synergy: Stabilizes and regenerates Vitamin C, enhancing its effectiveness
- Anti-Aging: Prevents oxidative damage to cell membranes and reduces wrinkle formation
- Protection: Shields skin from UV damage and environmental stressors
๐ง Sodium Hyaluronate Supporting Proven
Low molecular weight hyaluronic acid that penetrates deep into skin to attract and retain moisture, plumping skin and reducing the appearance of fine lines.
- Hydration: Holds up to 1000x its weight in water for intense moisture retention
- Plumping: Reduces appearance of fine lines by hydrating from within
- Barrier Support: Strengthens skin's moisture barrier function
โจ Niacinamide (Vitamin B3) Supporting Proven
A multi-functional powerhouse that brightens skin, minimizes pores, strengthens the skin barrier, and works synergistically with Vitamin C for enhanced results.
- Brightening: Inhibits melanin transfer to reduce hyperpigmentation
- Pore Refining: Regulates sebum production and minimizes enlarged pores
- Barrier Repair: Increases ceramide synthesis for stronger, healthier skin
๐งช Glutathione Supporting Promising
The body's master antioxidant that supports skin brightening and provides cellular protection against oxidative stress.
- Brightening: Inhibits melanin production for a more even skin tone
- Antioxidant: Regenerates other antioxidants including Vitamins C and E
- Detoxification: Helps neutralize harmful compounds and protect cells
25 ingredients
Water, Ascorbic Acid(13%), Butylene Glycol, Dipropylene Glycol, Tromethamine, 3-0-Ethyl Ascorbic Acid, Panthenol, Acetyl Glucosamine, Caffeine, Sodium Hyaluronate, Sodium Sulfite, Disodium EDTA, Glutathione, Adenosine, Gardenia Florida Fruit Extract, Allantoin, Dextrin, Squalane, Tocotrienols, Tocopherol, Elaeis Guineensis (Palm) Oil, Arginine, Niacinamide, Pentylene Glycol, Glycyrrhiza Glabra (Licorice) Root Extract
๐ Where It Fits in Your Routine
Apply after toner on clean skin. Wait 1-2 minutes before layering other products. Always follow with SPF 30+ sunscreen in the morning.
๐ How to Use
Shake Gently
Shake the bottle 1-2 times from side to side before each use to ensure ingredients are well-mixed.
Dispense 2-3 Drops
After cleansing and toning, apply 2-3 drops onto fingertips. A little goes a long way with this concentrated formula.
Gently Massage
Starting from the center of your face, gently pat and massage the serum outward toward the edges. Avoid direct eye contact.
Wait & Layer
Allow 1-2 minutes for absorption before applying next skincare steps. Follow with moisturizer and SPF 30+ sunscreen in the morning.
๐ค Who Is It For?
โ Perfect for you if:
- You're new to Vitamin C serums and want a gentle introduction
- You have hyperpigmentation, dark spots, or uneven skin tone
- Your skin looks dull and lacks radiance
- You want anti-aging benefits without harsh irritation
- You have sensitive skin that reacts to stronger actives
- You're looking for an affordable, effective K-beauty brightening serum
- You want to prevent early signs of aging
โ Consider alternatives if:
- You're experienced with Vitamin C and need higher concentrations (try COSRX 23%)
- You have severe hyperpigmentation requiring prescription-strength treatments
- You cannot store products in the refrigerator
- You're prone to fungal acne (malassezia folliculitis)
- You prefer oil-based or anhydrous Vitamin C formulations
- You want a larger bottle size for longer-term use
๐ฏ Skin Type Compatibility
Lightweight, water-based formula absorbs quickly without adding shine or greasiness. Helps brighten post-acne marks.
Contains Hyaluronic Acid for hydration, but dry skin types may need a richer moisturizer on top for optimal comfort.
Balances well across different face zones. Light enough for oily T-zone while still providing hydration for dry areas.
Clinically tested as non-irritating. 13% concentration is gentle yet effective. Fragrance-free formula minimizes reaction risk.
Low comedogenic rating (1/5). Great for fading post-inflammatory hyperpigmentation. Contains Niacinamide for pore care.
Boosts collagen production, improves elasticity, and reduces fine lines. Adenosine provides additional anti-wrinkle benefits.
๐ Results Timeline
Immediate Radiance
Skin appears brighter and more hydrated. The lightweight formula absorbs quickly, leaving a subtle glow. Some users may experience mild tingling initially as skin adjusts.
85% noticed improved radianceVisible Brightening
Noticeable improvement in overall skin tone. Dark spots begin to fade. Clinical trials show 3.94% improvement in brightness after 4 weeks of use.
78% saw brighter skin toneDark Spot Fading
Significant reduction in hyperpigmentation and post-acne marks. Skin texture becomes smoother. Clinical results show 31.92% improvement in redness.
72% noticed faded dark spotsAnti-Aging Benefits
Improved elasticity and reduced fine lines become visible. Clinical trials demonstrate 10.64% improvement in wrinkles around the eye area and 36.97% reduction in pore volume.
65% reported firmer skinโญ Ratings by Platform
โ๏ธ Pros & Cons
โ Praised
- Effective brightening results for dark spots and hyperpigmentation
- Gentle formula suitable for sensitive skin and vitamin C beginners
- Lightweight, fast-absorbing texture without stickiness
- Affordable compared to high-end vitamin C serums
- Contains multiple beneficial ingredients (Vitamin E, HA, Niacinamide)
- Fragrance-free and clinically tested for irritation
- Visible results in 2-4 weeks of consistent use
โ Criticized
- Small bottle size (20ml) depletes quickly with daily use
- Requires refrigeration to prevent oxidation
- Short shelf life once opened (6 months)
- Natural coppery/metallic vitamin C scent
- May not be potent enough for experienced vitamin C users
- Dropper can be messy with watery formula
- Not fungal acne safe due to certain oils
๐ฐ Budget-Friendly Alternatives (Dupes)
Higher concentration (23%) in silicone-based suspension. Gritty texture and longer absorption time. More affordable but may be too strong for sensitive skin.
Lower concentration (5%) makes it gentler but slower-acting. Better for very sensitive skin. Larger bottle (35ml) lasts longer. More stable formula.
Higher concentration with stabilizing ferulic acid. Larger bottle (30ml). More potent but may cause more irritation for sensitive skin types.
Same formula but with 23% vitamin C concentration. Better for experienced users who need stronger results. Not recommended for vitamin C beginners.
๐ Comparison with Competitors
COSRX Vitamin C 13 Serum (This Product)
~$22SkinCeuticals C E Ferulic
~$182Dear, Klairs Freshly Juiced Vitamin Drop
~$23The Ordinary Vitamin C Suspension 23%
~$6.80๐ฆ Storage & Shelf Life
6 months after opening. Pure vitamin C oxidizes quickly once exposed to air. Use consistently for best results.
Store upright in refrigerator (3-10ยฐC / 37-50ยฐF) to prevent oxidation. Keep away from direct sunlight and heat sources.
Dark glass dropper bottle with specially designed cap to control gas buildup from vitamin C oxidation process.
Yes, under 100ml TSA limit. For travel, keep in insulated bag with ice pack to maintain cool temperature.
โ Frequently Asked Questions
Yes, this serum is generally considered safe during pregnancy and breastfeeding. Vitamin C (ascorbic acid) is a pregnancy-safe ingredient. The formula contains no retinoids, hydroquinone, or high-concentration salicylic acid. However, as with any skincare product, consult your healthcare provider before use during pregnancy or nursing.
Use with caution. The serum contains Squalane and Elaeis Guineensis (Palm) Oil, which may feed malassezia yeast in some individuals prone to fungal acne. If you have a history of fungal acne, perform a patch test first or consider a fungal acne-safe alternative vitamin C serum.
It's best to avoid using vitamin C with retinol, AHA, or BHA in the same routine to prevent irritation. Use vitamin C in the morning and retinol at night. If using acids, alternate days or apply vitamin C in AM and acids in PM. The formula already contains niacinamide, which works synergistically with vitamin C.
This serum is excellent for all skin types, especially sensitive skin and vitamin C beginners. The 13% concentration is effective yet gentle. It's ideal for oily, combination, normal, and sensitive skin. Dry skin types may need additional moisturizer. Those with very experienced skin may prefer the 23% version for stronger results.
Most users notice improved radiance within 1-2 weeks. Visible brightening and dark spot fading typically occurs around weeks 3-4. Clinical trials showed 31.92% improvement in redness and nearly 37% reduction in pore volume after consistent use. Full anti-aging benefits like improved elasticity become apparent after 8-12 weeks of daily use.
Apply after cleansing and toning, before other serums and moisturizer. The order is: Cleanser โ Toner โ Vitamin C Serum โ Essence/Other Serums โ Moisturizer โ Sunscreen (AM). Apply 2-3 drops and wait 1-2 minutes before layering other products. Always follow with SPF 30+ sunscreen in the morning.
No, this serum has a low comedogenic rating of 1/5. The lightweight, water-based formula contains minimal pore-clogging ingredients. It also includes Niacinamide which helps minimize pores and regulate sebum production. It's suitable for most acne-prone skin types, though those with fungal acne should exercise caution.
The serum has a 6-month PAO (Period After Opening) when stored properly in the refrigerator. Pure vitamin C oxidizes when exposed to air, light, and heat. Signs of oxidation include color change from pale yellow to dark orange/brown and a metallic smell. Once oxidized, the serum loses effectiveness and should be discarded.
Verdict: COSRX The Vitamin C 13 Serum is an excellent entry-level vitamin C serum that delivers real brightening results without the irritation commonly associated with pure ascorbic acid. The 13% concentration hits a sweet spot between efficacy and gentleness, making it perfect for vitamin C beginners and sensitive skin types. The addition of Tocotrienol (Super Vitamin E), Hyaluronic Acid, Niacinamide, and Glutathione elevates this beyond a simple vitamin C serum into a multi-functional brightening treatment. While the small bottle size and refrigeration requirement may be drawbacks for some, the affordable price point and clinically-proven results make this a standout choice in the K-beauty brightening category. If you're ready for stronger results, consider graduating to the 23% version.
