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Vitamin C Serum

COSRX The Vitamin C 23 Serum

COSRX

Best-in-class. Outstanding performance and efficacy.

$25 0.68 fl oz · $36.76/fl oz · Mid-Range
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Ingredient Details
Free From: Fragrance
Contains: AlcoholSilicones
Key Actives: Pure Ascorbic Acid (L-Ascorbic Acid) 23%Super Vitamin E (Tocotrienols)Hyaluronic Acid (Sodium Hyaluronate)NiacinamideGlutathione
COSRX The Vitamin C 23 Serum by COSRX – 0.68 fl oz
100
0
0
Score for Hyperpigmentation
Exceptional
Skin Conditions
Why 93 score for Hyperpigmentation ↓
Per-Condition Analysis

How COSRX The Vitamin C 23 Serum Performs Across 6 Skin Concerns

We evaluated COSRX The Vitamin C 23 Serum individually against 6 skin concerns — each with its own clinical reasoning, real user feedback, considerations, and usage guidance. Select a condition to explore its full analysis.

COSRX The Vitamin C 23 Serum for Hyperpigmentation

Best Match
Exceptional Ranked #1 of 6 conditions for this product
Verdict Best-in-class. Outstanding performance and efficacy.

Expert Analysis

Achieves exceptional rating (93/100) as a potent hyperpigmentation treatment that delivers clinical-grade brightening results through the highest concentration of pure vitamin C available in K-beauty serums. The 23% pure ascorbic acid directly inhibits tyrosinase enzyme activity to block melanin synthesis at the source, while glutathione and niacinamide provide additional melanin reduction pathways that attack dark spots from multiple angles. Clinical trials document 16.26% improvement in visible melasma and blemishes within 4 weeks, with 32.89% reduction in redness contributing to more even tone throughout. Users consistently report significant fading of post-acne marks, sun damage, and stubborn dark spots within 2-3 weeks of consistent use, describing skin as dramatically brighter and more translucent. The dual-layer oil and water formulation protects vitamin C from oxidation while ensuring stable delivery of active ingredients to melanocytes. This represents the gold standard for serious hyperpigmentation concerns when tolerance to high-strength vitamin C has been established.

How to Use for Hyperpigmentation

Apply 2-3 drops to clean, dry skin in morning or evening after cleansing. Shake bottle 1-2 times before use to mix the two-layer formula. Pat gently into face using fingertips, starting from center and working outward. Wait 5-10 minutes before applying next product to allow full absorption. For hyperpigmentation treatment, use daily for first month, then assess tolerance - if no irritation, continue daily use. Always follow with SPF 30+ sunscreen in morning application. Layer with hydrating serum or moisturizer if stickiness bothers you. Store upright in refrigerator immediately after each use. Use within 2 months of opening for maximum efficacy.

Important Considerations

  • 1 Requires refrigerated storage between 3-10 degrees Celsius and must be used within 2 months of opening to maintain potency and prevent oxidation
  • 2 Natural coppery scent from pure ascorbic acid is common and does not affect efficacy - fragrance-free formula prioritizes function over cosmetic elegance
  • 3 Must be paired with SPF 30+ sunscreen during daytime use - vitamin C increases photosensitivity and sun exposure will worsen hyperpigmentation
  • 4 Best suited for those with previous vitamin C experience - the 23% concentration is extremely potent and may overwhelm vitamin C beginners
  • 5 Results require consistency over 2-3 months for maximum fading - hyperpigmentation treatment is a marathon, not a sprint

What Users Say for Hyperpigmentation

1247 Reviews
4.6 Avg Rating
87% Positive
Sources: AmazoniHerbDermstoreReddit r/AsianBeautyCupidrop

Users with hyperpigmentation consistently describe this as their holy grail for fading dark spots, with many reporting that stubborn post-acne marks and sun damage that resisted other treatments finally began clearing within 2-3 weeks. Common praise includes skin looking dramatically brighter and more translucent, with one reviewer noting her periorbital hyperpigmentation completely disappeared. Multiple users mention this works better than expensive dermatologist-prescribed options, though some note the initial stinging sensation on application. The sticky texture is mentioned as a minor inconvenience that becomes tolerable when layered with moisturizer. Several reviewers emphasize the importance of refrigeration and consistent use, noting that results plateau if application becomes irregular. The strong odor is frequently mentioned but considered worthwhile given the visible brightening results.

Data collected: 2025-10-29
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COSRX The Vitamin C 23 Serum for Dull/Uneven Texture

Excellent Ranked #2 of 6 conditions for this product
Verdict Excellent choice. Highly recommended for this condition.

Expert Analysis

Achieves excellent rating (91/100) as an exceptional brightening treatment that transforms dull, lackluster skin into radiant, glowing complexion through multiple complementary mechanisms. The 23% pure ascorbic acid provides direct antioxidant activity that neutralizes free radicals causing oxidative stress and dullness, while simultaneously inhibiting melanin formation to reveal brighter underlying skin tone. Clinical trials document impressive 32.36% improvement in skin radiance and 3.95% increase in brightness within just 4 weeks. The formula addresses texture concerns through gentle cell turnover promotion, with caffeine providing additional circulation boost that brings fresh oxygen and nutrients to surface. Users consistently report immediate glow after first application, with cumulative brightening effects becoming dramatic after 2-3 weeks of consistent use. The dual-layer oil and serum texture creates luminous dewy finish that enhances radiance both immediately and long-term. This represents one of the most effective solutions for persistent dullness and uneven texture when high-potency vitamin C can be tolerated.

How to Use for Dull/Uneven Texture

Apply 2-3 drops to clean, dry skin after cleansing but before other serums. Shake bottle lightly to mix layers before dispensing. Pat gently into skin using upward motions, focusing on areas with most noticeable dullness. Allow 5-10 minutes for complete absorption before layering additional products. For maximum radiance, use in morning routine followed by hydrating toner or essence while skin is still slightly damp. The dewy finish can be set with lightweight moisturizer and powder if needed for makeup application. For texture concerns, can be used both morning and evening, but evening use may be preferable for those with oily skin. Always follow morning application with SPF 30+ sunscreen.

Important Considerations

  • 1 Creates slightly oily, dewy finish that enhances radiance but may feel too heavy for those who prefer matte finish or wear heavy makeup
  • 2 Initial application may cause slight tingling sensation on areas with rough texture - this is normal response to high-strength vitamin C and typically subsides
  • 3 Natural coppery scent from pure ascorbic acid is strongest on first application but fades as serum absorbs - odor does not linger
  • 4 The 38.65% pore volume reduction noted in clinical trials is secondary benefit rather than primary function for dull skin
  • 5 Consistency is critical for maintaining radiance results - irregular use will cause glow to fade as antioxidant protection lapses

What Users Say for Dull/Uneven Texture

1056 Reviews
4.7 Avg Rating
89% Positive
Sources: AmazoniHerbInfluensterReddit r/AsianBeautyTikTok

Users with dull skin rave about the immediate glow this provides, with many describing instant radiance even before long-term brightening kicks in. Common praise includes skin looking dramatically more luminous and alive, with multiple reviewers noting coworkers asking what they changed in their routine. Several users mention this finally gave them the glass skin effect they sought from K-beauty products, though the oily texture takes adjustment. The brightening effect is consistently described as superior to other vitamin C serums, with one reviewer noting her skin went from looking tired and sallow to fresh and glowing within 2 weeks. Some mention the sticky residue requires patience but becomes unnoticeable once additional products are layered. Multiple users emphasize refrigerating the product maintains potency and prevents the formula from oxidizing into ineffectiveness.

Data collected: 2025-10-29
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COSRX The Vitamin C 23 Serum for Aging/Mature Skin

Excellent Ranked #3 of 6 conditions for this product
Verdict Excellent choice. Highly recommended for this condition.

Expert Analysis

Earns excellent rating (89/100) as a comprehensive anti-aging powerhouse that addresses multiple aging concerns through proven collagen-boosting mechanisms and antioxidant protection. The 23% ascorbic acid stimulates collagen gene transcription while acting as essential cofactor for proline hydroxylation during collagen synthesis, directly counteracting the collagen degradation that causes wrinkles and sagging. Clinical trials show 16.36% improvement in elasticity and 11.43% reduction in wrinkles within 4 weeks, with tocotrienols providing 50 times greater antioxidant activity than standard vitamin E to neutralize free radicals that accelerate aging. Adenosine contributes additional anti-wrinkle benefits through improved skin regeneration. The combination of collagen production, antioxidant protection, and free radical neutralization creates comprehensive defense against both intrinsic aging and photoaging. While impressive results require consistent long-term use, this represents one of the most research-backed anti-aging actives available at this concentration in drugstore-accessible products.

How to Use for Aging/Mature Skin

Apply 2-3 drops to clean skin in morning routine for maximum antioxidant protection against daytime free radical damage. Shake bottle before use to mix layers. Pat gently into face and neck, avoiding eye area unless specifically targeting under-eye concerns. Wait 10 minutes before applying other actives. For mature skin, pair with hyaluronic acid serum while skin is still damp, then follow with peptide moisturizer and rich eye cream. Always use SPF 30+ sunscreen as final morning step. Can be used in evening routine but morning application maximizes photoprotection benefits. For enhanced anti-aging results, alternate evening with retinoid product but never use both same night.

Important Considerations

  • 1 Anti-aging results require minimum 8-12 weeks of consistent daily use - collagen production is gradual process that cannot be rushed
  • 2 The 23% concentration may cause initial tingling or stinging sensation that typically subsides as skin adapts over first 1-2 weeks
  • 3 Slightly oily texture from dual-layer formula creates dewy finish that some mature users love but others find uncomfortable under makeup
  • 4 Must be used with comprehensive sun protection - vitamin C increases photosensitivity and UV exposure will accelerate aging despite product use
  • 5 Not formulated with ferulic acid which would enhance stability and longevity - requires refrigerated storage and use within 2 months

What Users Say for Aging/Mature Skin

892 Reviews
4.5 Avg Rating
84% Positive
Sources: AmazoniHerbMakeupAlleyReddit r/30PlusSkinCare

Users in their 30s-50s report noticeable improvements in skin texture, firmness, and fine line appearance within 2-3 weeks of consistent use, describing skin as looking fresher and more youthful. Many mention this performs comparably to expensive professional treatments at a fraction of the cost. Common praise includes improved elasticity around eyes and forehead, with one user noting creases around eyes became less noticeable after 3 weeks. Several reviewers describe skin as more plump and supple, though some note minimal results on deeper wrinkles without combining with retinoids. The sticky texture and strong odor are mentioned as minor drawbacks but considered tolerable given the visible anti-aging results. Multiple users emphasize this works best as part of comprehensive routine including retinoids and peptides rather than standalone miracle worker.

Data collected: 2025-10-29
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COSRX The Vitamin C 23 Serum for Acne-Prone Skin

Good Ranked #4 of 6 conditions for this product
Verdict Solid option. Reliable performance.

Expert Analysis

Earns good rating (76/100) as a treatment that delivers genuine benefits for post-acne hyperpigmentation and overall skin health but requires careful consideration of the irritation-breakout paradox that plagues many acne-prone users. The 23% ascorbic acid excels at fading post-inflammatory hyperpigmentation through melanin inhibition, with niacinamide providing anti-inflammatory support and sebum regulation that benefits active acne. Antioxidant protection helps reduce inflammation that triggers breakouts, while vitamin C's role in collagen synthesis aids healing of acne scarring. However, the formula's complexity creates significant risk - the slightly oily texture and high concentration can trigger stress breakouts in reactive acne-prone skin, while irritation from the potent ascorbic acid may cause new inflammatory lesions. Success depends heavily on individual tolerance and careful introduction. Those with non-inflammatory acne concerns seeking pigmentation fading will find this more beneficial than those battling active inflamed breakouts where irritation risk outweighs benefits.

How to Use for Acne-Prone Skin

Introduce cautiously with twice-weekly evening application initially, never applying to active inflamed pimples or broken skin. Apply to clean, completely dry skin after any acne treatments have fully absorbed and dried. Use minimal amount - 2 drops maximum for entire face to avoid overwhelming skin. Wait 15 minutes before applying lightweight, oil-free moisturizer. If no increase in breakouts after 2 weeks, gradually increase to every-other-day use. For post-acne marks, apply directly to dark spots with clean fingertip rather than entire face. Never use same routine as benzoyl peroxide or salicylic acid - alternate days or use vitamin C in morning and acne actives at night. Always follow morning application with oil-free SPF 30+ sunscreen.

Important Considerations

  • 1 Dual-layer oil formulation may feel too heavy for very oily acne-prone skin and can contribute to congestion in some users despite non-comedogenic claims
  • 2 High irritation potential from 23% concentration can trigger stress breakouts and worsen inflammatory acne through skin barrier disruption
  • 3 Should NOT be used concurrently with benzoyl peroxide, salicylic acid, or retinoids without careful spacing - combining increases irritation exponentially
  • 4 Best results for post-acne marks rather than active breakouts - fighting active acne while using this requires very strategic routine planning
  • 5 The sticky residue may trap dirt and oil if not properly cleansed evening, creating hygiene concern for acne-prone skin

What Users Say for Acne-Prone Skin

678 Reviews
4.2 Avg Rating
71% Positive
Sources: AmazoniHerbReddit r/acneNykaaMan

Acne-prone users report mixed experiences heavily dependent on their specific acne type and skin reactivity. Those with hormonal acne focused on post-inflammatory marks praise this as highly effective for fading stubborn dark spots faster than any other treatment tried, with several noting dramatic improvement in overall skin tone evenness. However, users with inflammatory cystic acne more frequently report breakout worsening from either irritation or formula heaviness. One reviewer with acne-prone sensitive skin noted it was the only vitamin C that did not cause redness but still achieved brightening results. Multiple users emphasize importance of starting slow and monitoring closely for increased breakouts, with recommendation to discontinue immediately if new lesions appear. Common pattern shows best success when used alone without other actives during adaptation period.

Data collected: 2025-10-29
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COSRX The Vitamin C 23 Serum for Dry/Dehydrated Skin

Good Ranked #5 of 6 conditions for this product
Verdict Solid option. Reliable performance.

Expert Analysis

Receives good rating (72/100) as a vitamin C treatment that provides adequate hydration support through humectants but cannot fully overcome the inherent drying nature of high-concentration ascorbic acid formulations. The sodium hyaluronate, panthenol, and squalane create moisture-retaining network that prevents the severe dehydration some vitamin C serums cause, while the oil layer in dual-phase formula adds occlusive properties that help seal hydration. However, dry skin users consistently report needing substantial additional moisturization to counteract the slight drying effect, and the 23% concentration can compromise already-fragile barrier function in severely dehydrated skin. The sticky texture some users describe actually benefits dry skin by creating film that reduces transepidermal water loss, though this is unintentional rather than optimized design. This works adequately for mildly dry skin seeking brightening benefits but severely dehydrated skin will struggle with irritation and further moisture depletion. Better options exist specifically formulated for dry skin needs.

How to Use for Dry/Dehydrated Skin

Apply to clean, slightly damp skin - the moisture helps buffer vitamin C intensity for dry skin. Use 2-3 drops and pat gently into face. Immediately layer with hydrating serum or essence while skin is still damp to lock in moisture. Wait 5 minutes for vitamin C absorption, then apply rich moisturizer containing ceramides, fatty acids, or hyaluronic acid. For very dry skin, follow with facial oil or occlusive balm at night. Use in evening rather than morning if dryness is severe, as this allows longer recovery time before environmental exposure. During dry winter months, reduce frequency to every-other-day. Always ensure skin is properly hydrated before application to minimize irritation and barrier disruption.

Important Considerations

  • 1 Requires layering with rich moisturizer immediately after application - cannot be used alone without subsequent dehydration for dry skin types
  • 2 The 23% ascorbic acid concentration can disrupt compromised barrier function common in chronically dry skin, worsening dehydration
  • 3 Slight tingling or stinging sensation is more pronounced on dry, flaky skin and may indicate excessive irritation rather than normal adjustment
  • 4 Must wait several minutes between application and moisturizer to allow vitamin C absorption, but this waiting period allows surface dehydration
  • 5 Refrigerated storage required - cold application on dry winter skin can be uncomfortable and may temporarily increase tightness feeling

What Users Say for Dry/Dehydrated Skin

412 Reviews
4.1 Avg Rating
69% Positive
Sources: AmazoniHerbReddit r/DrySkinCare

Dry skin users appreciate the brightening results but consistently emphasize the need for additional hydration support, with most layering hyaluronic acid serum before and rich moisturizer after to prevent dehydration. Several mention the oily texture they initially disliked actually helps create barrier that prevents moisture loss, making the stickiness beneficial rather than problematic. Some describe initial tightness after application that resolves once moisturizer is added. Multiple users note their dry skin became more resilient and less flaky with consistent use, likely due to improved barrier function from niacinamide and panthenol. However, those with severely dehydrated skin report the formula too harsh, causing increased sensitivity and flaking. Common recommendation is to use every-other-day initially to allow barrier adaptation before daily use.

Data collected: 2025-10-29
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COSRX The Vitamin C 23 Serum for Sensitive Skin

Caution Ranked #6 of 6 conditions for this product
Verdict Use with caution. Review considerations carefully.

Expert Analysis

Receives cautious recommendation (68/100) as the 23% concentration creates significant irritation risk that makes this unsuitable for most sensitive skin despite the brand's gentle reputation and clinical irritation study claiming non-irritant status. While COSRX formulated with soothing ingredients like panthenol, allantoin, and niacinamide to buffer the ascorbic acid, real-world user experiences reveal substantial percentage of sensitive skin types experience stinging, redness, and even breakouts from the high potency. The product tests as non-irritant in controlled 24-hour dermal studies but prolonged daily use tells different story for reactive skin. Those with sensitive skin who have successfully built tolerance to lower-concentration vitamin C products may find this tolerable with careful introduction, but this should never be first vitamin C experience. The benefits of antioxidant protection and brightening are real but must be weighed against high likelihood of adverse reaction. For sensitive skin seeking vitamin C benefits, the brand's 13% formulation represents safer starting point.

How to Use for Sensitive Skin

MUST perform patch test on inner arm or behind ear for 48 hours before face application. If patch test shows no reaction, apply single drop to small area of face on first use. Wait 24 hours and assess for delayed irritation. If tolerated, start with twice-weekly application in evening only. Apply to clean, completely dry skin - never on damp skin as this increases penetration and irritation. Wait 20 minutes before applying any other products. Buffer irritation by immediately following with soothing moisturizer containing ceramides or centella. If redness or stinging develops, reduce frequency or discontinue use. Never use on same evening as other actives. Store in refrigerator and use within 2 months.

Important Considerations

  • 1 CRITICAL - Mandatory patch test on inner arm for 24-48 hours before facial application to assess individual reaction - skip this at your own risk
  • 2 Start with every-other-day or twice-weekly application to allow skin adaptation period before increasing frequency
  • 3 May cause stinging, burning, or tingling sensation even on intact skin - this is not always temporary adjustment period but may indicate incompatibility
  • 4 Some sensitive skin users report breakouts and post-inflammatory hyperpigmentation from irritation, creating opposite of intended brightening effect
  • 5 Cannot be used with other actives like AHAs, BHAs, or retinoids without severe irritation risk - requires very minimal routine
  • 6 The 2-month expiration after opening creates pressure to use quickly, but rushing frequency increases irritation likelihood

What Users Say for Sensitive Skin

534 Reviews
3.9 Avg Rating
63% Positive
Sources: AmazonThe Empties DiariesMy Skincare RegimeReddit r/SensitiveSkinCare

Sensitive skin users report highly polarized experiences - those who tolerate it love the results, but significant percentage describe painful stinging, persistent redness, and stress breakouts that took weeks to resolve. One reviewer with hypersensitive skin noted it completely broke her out despite loving the brightening effect, creating post-inflammatory marks worse than original concern. Multiple users mention starting slowly with twice-weekly application allowed eventual tolerance building, while others found even minimal use caused too much irritation. Common pattern shows reactive, acne-prone sensitive skin has worst outcomes, while dry sensitive skin has better success rate when properly buffered with moisturizer. Many recommend the 13% version for sensitive skin instead, noting the lower concentration provides benefits without trauma.

Data collected: 2025-10-29
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Frequently Asked Questions

Is COSRX The Vitamin C 23 Serum good for hyperpigmentation?
COSRX The Vitamin C 23 Serum scores 93/100 (Exceptional) for hyperpigmentation. Best-in-class. Outstanding performance and efficacy.
How do I use COSRX The Vitamin C 23 Serum for hyperpigmentation?
Apply 2-3 drops to clean, dry skin in morning or evening after cleansing. Shake bottle 1-2 times before use to mix the two-layer formula. Pat gently into face using fingertips, starting from center and working outward. Wait 5-10 minutes before applying next product to allow full absorption. For hyperpigmentation treatment, use daily for first month, then assess tolerance - if no irritation, continue daily use. Always follow with SPF 30+ sunscreen in morning application. Layer with hydrating serum or moisturizer if stickiness bothers you. Store upright in refrigerator immediately after each use. Use within 2 months of opening for maximum efficacy.
Is COSRX The Vitamin C 23 Serum good for dull/uneven texture?
COSRX The Vitamin C 23 Serum scores 91/100 (Excellent) for dull/uneven texture. Excellent choice. Highly recommended for this condition.
How do I use COSRX The Vitamin C 23 Serum for dull/uneven texture?
Apply 2-3 drops to clean, dry skin after cleansing but before other serums. Shake bottle lightly to mix layers before dispensing. Pat gently into skin using upward motions, focusing on areas with most noticeable dullness. Allow 5-10 minutes for complete absorption before layering additional products. For maximum radiance, use in morning routine followed by hydrating toner or essence while skin is still slightly damp. The dewy finish can be set with lightweight moisturizer and powder if needed for makeup application. For texture concerns, can be used both morning and evening, but evening use may be preferable for those with oily skin. Always follow morning application with SPF 30+ sunscreen.
Is COSRX The Vitamin C 23 Serum good for aging/mature skin?
COSRX The Vitamin C 23 Serum scores 89/100 (Excellent) for aging/mature skin. Excellent choice. Highly recommended for this condition.
How do I use COSRX The Vitamin C 23 Serum for aging/mature skin?
Apply 2-3 drops to clean skin in morning routine for maximum antioxidant protection against daytime free radical damage. Shake bottle before use to mix layers. Pat gently into face and neck, avoiding eye area unless specifically targeting under-eye concerns. Wait 10 minutes before applying other actives. For mature skin, pair with hyaluronic acid serum while skin is still damp, then follow with peptide moisturizer and rich eye cream. Always use SPF 30+ sunscreen as final morning step. Can be used in evening routine but morning application maximizes photoprotection benefits. For enhanced anti-aging results, alternate evening with retinoid product but never use both same night.
What are the key active ingredients in COSRX The Vitamin C 23 Serum?
The key active ingredients are Pure Ascorbic Acid (L-Ascorbic Acid), Super Vitamin E (Tocotrienols), Hyaluronic Acid (Sodium Hyaluronate), Niacinamide, Glutathione, Adenosine. Antioxidant, collagen synthesis, melanin inhibition, brightening

Key Active Ingredients

Pure Ascorbic Acid (L-Ascorbic Acid)
Concentration: 23%
Antioxidant, collagen synthesis, melanin inhibition, brightening
Super Vitamin E (Tocotrienols)
Concentration: Not disclosed
Antioxidant synergy with vitamin C, collagen production support
Hyaluronic Acid (Sodium Hyaluronate)
Concentration: Not disclosed
Humectant, hydration, moisture retention
Niacinamide
Concentration: Not disclosed
Barrier support, anti-inflammatory, sebum regulation
Glutathione
Concentration: Not disclosed
Antioxidant, melanin reduction
Adenosine
Concentration: Not disclosed
Anti-wrinkle, skin soothing

Full INCI Ingredients

WaterAscorbic Acid (23%)PropanediolDimethiconeTromethaminePanthenolEthyl Ascorbyl EtherSqualaneCaffeineSodium Chloride

Conflicts & Safety

Do not use with AHA or BHA acids - high risk of irritation when combined
Avoid concurrent use with retinoids - may cause excessive irritation and sensitization
Must use SPF 30+ when using this product during daytime application
Patch test required before use - 23% concentration can cause stinging, redness, or irritation
Must be stored in refrigerator between 3-10 degrees Celsius to prevent oxidation

Clinical Evidence

Level: Strong

Pure L-ascorbic acid at 10-20% concentrations has extensive peer-reviewed research supporting collagen synthesis stimulation, melanin inhibition, and antioxidant photoprotection. Multiple clinical trials document efficacy in reducing wrinkles, improving elasticity, and brightening hyperpigmentation. Product-specific clinical trial on 20 subjects shows 16.26% improvement in pigmentation, 32.36% brightening effect, 16.36% elasticity improvement, and 38.65% pore volume reduction within 4 weeks. Tocotrienols have documented synergistic antioxidant effects with vitamin C. However, lack of ferulic acid in formulation reduces long-term stability compared to research gold-standard formulations.

Certifications

Cruelty-FreeFragrance-Free
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