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Head-to-head evidence comparison — which supplement is right for you?
Benzoyl Peroxide and Kojic Acid are closely matched across evidence, studies, and safety.
Verdict
Mostly mechanism / observational
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
Topical OTC use. Benzoyl peroxide is used at 2.5-10% in gels, creams, and washes, applied to acne-prone areas once or twice daily; lower strengths (2.5-5%) are usually as effective as 10% with less irritation. There is no oral or systemic dose — it is not ingested. It is often combined with a retinoid (e.g. adapalene) for greater effect. This library does not provide an ingestion protocol.
any
Leave-on gel/cream (2.5-5%) or a fixed combination with a retinoid
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)
Throughout
4-12 weeks
Throughout
First weeks
Throughout
8-12 weeks
Throughout
1-12 months
Topical benzoyl peroxide for acne.
Cochrane Database Syst Rev (2020) · Systematic review
Pooled 120 RCTs (29,592 participants); BPO more effective than placebo/no treatment for participant-reported improvement (RR 1.27, 95% CI 1.12 to 1.45)
Efficacy of topical treatments for mild-to-moderate acne: A systematic review and meta-analysis of randomized control trials.
J Eur Acad Dermatol Venereol (2025) · Meta analysis
Network meta-analysis of 35 RCTs (33,472 participants) comparing nine topical acne agents
Adapalene-benzoyl peroxide, a fixed-dose combination for the treatment of acne vulgaris: results of a multicenter, randomized double-blind, controlled study.
J Am Acad Dermatol (2007) · Rct · n=517
517 subjects randomized double-blind to adapalene-BPO, adapalene, BPO, or vehicle for 12 weeks
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)
Both Benzoyl Peroxide and Kojic Acid are closely matched — the best choice depends on your specific health goals.
No known interactions between Benzoyl Peroxide and Kojic Acid have been documented in our database. However, always consult a healthcare provider before combining supplements.