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Head-to-head evidence comparison — which supplement is right for you?
Vitamin C (topical) wins 1 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
Shared outcomes (1)
Outcomes where both Kojic Acid and Vitamin C (topical) have evidence — compare verdict strength side-by-side.
Topical cosmetic only. Kojic acid is typically used at roughly 1-2% in leave-on serums or creams (or as the more stable kojic acid dipalmitate), applied to areas of hyperpigmentation once or twice daily, often alongside other brighteners and daily sunscreen. There is no oral, injectable, or systemic dose — it is not ingested. This library does not provide an ingestion protocol.
any
Leave-on topical serum or cream (≈1-2% kojic acid, or kojic acid dipalmitate)
Topical cosmetic only. L-ascorbic acid serums are typically 10-20% (often near pH 3 for absorption); stable derivatives are used at varying percentages. Apply a few drops to clean, dry skin, usually in the morning under sunscreen (its antioxidant action complements SPF). There is no oral, injectable, or systemic dose in this cosmetic context. This library does not provide an ingestion protocol.
morning
Leave-on topical serum (10-20% L-ascorbic acid) or a stable vitamin C derivative
Throughout
8-12 weeks
Throughout
1-12 months
Throughout
8-12 weeks
8-24 weeks
Throughout
Treatment of melasma using kojic acid in a gel containing hydroquinone and glycolic acid.
Dermatol Surg (1999) · Rct · n=40
Split-face randomized design in 40 women with epidermal melasma: 2% kojic acid added to a 10% glycolic acid + 2% hydroquinone base vs the base alone
Efficacy and safety of topical agents in the treatment of melasma: What's evidence? A systematic review and meta-analysis.
J Cosmet Dermatol (2023) · Meta analysis
Pooled 45 efficacy studies (2359 patients) of topical melasma treatments using MASI standardised mean differences
Kojic Acid vis-a-vis its Combinations with Hydroquinone and Betamethasone Valerate in Melasma: A Randomized, Single Blind, Comparative Study.
Indian J Dermatol (2013) · Rct · n=80
80 melasma patients randomized over 12 weeks to kojic acid 1% alone, kojic acid + hydroquinone 2%, kojic acid + betamethasone, or all three (MASI-assessed)
Use of topical ascorbic acid and its effects on photodamaged skin topography.
Arch Otolaryngol Head Neck Surg (1999) · Rct · n=19
Split-face, randomized, double-blind, vehicle-controlled trial: active L-ascorbic acid serum vs vehicle daily for 3 months in mild-to-moderate facial photodamage
Topical ascorbic acid on photoaged skin. Clinical, topographical and ultrastructural evaluation: double-blind study vs. placebo.
Exp Dermatol (2003) · Rct
6-month double-blind randomized trial comparing 5% vitamin C cream vs its excipient on photoaged skin of the low-neck and arms
Efficacy of topical vitamin C in melasma and photoaging: A systematic review.
J Cosmet Dermatol (2023) · Systematic review
Systematic review of prospective RCTs of topical vitamin C in melasma or photodamage: 7 publications, 139 total volunteers
Vitamin C (topical) has a higher evidence score (6/10 vs 6/10) and wins in 1 of 3 categories.
Both Kojic Acid and Vitamin C (topical) score equally (70) for even skin tone.
No known interactions between Kojic Acid and Vitamin C (topical) have been documented in our database. However, always consult a healthcare provider before combining supplements.