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Head-to-head evidence comparison — which supplement is right for you?
Kojic Acid wins 2 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 Alpha-Arbutin and Kojic Acid have evidence — compare verdict strength side-by-side.
Topical cosmetic only. Alpha-arbutin is typically used at roughly 1-2% in leave-on serums, applied to areas of hyperpigmentation once or twice daily, usually alongside daily sunscreen and often with other brighteners. 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 (≈1-2% alpha-arbutin)
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
8-12 weeks
Throughout
Throughout
Throughout
8-12 weeks
Throughout
1-12 months
The Efficacy of Topical Cosmetic Containing Alpha-Arbutin 5% and Kojic Acid 2% Compared With Triple Combination Cream for the Treatment of Melasma: A Split-Face, Evaluator-Blinded Randomized Pilot Study.
J Cosmet Dermatol (2025) · Rct · n=30
Split-face, evaluator-blinded randomized pilot in 30 melasma patients: alpha-arbutin 5% + kojic acid 2% vs triple-combination cream over 12 weeks
Efficacy and Safety of a Topical Formulation Containing Trihydroxybenzoic Acid Glucoside and α-Arbutin, Applied Along With a Sunscreen: A Noncomparative, Prospective, Interventional Study in Indian Females With Facial Melasma or Dark Spots.
J Cosmet Dermatol (2025) · Open label · n=124
Open-label, single-arm 90-day study in 124 Indian women using alpha-arbutin 2% + trihydroxybenzoic acid glucoside twice daily plus once-daily sunscreen
Inhibitory effects of alpha-arbutin on melanin synthesis in cultured human melanoma cells and a three-dimensional human skin model.
Biol Pharm Bull (2004) · In vitro
Foundational mechanism study: alpha-arbutin reduced melanin synthesis in cultured human melanoma cells (to 76% at 0.5 mM) and to 40% of control in a 3D human skin model
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)
Kojic Acid has a higher evidence score (6/10 vs 4/10) and wins in 2 of 3 categories.
For even skin tone, Kojic Acid has a higher relevance score (70 vs 60).
No known interactions between Alpha-Arbutin and Kojic Acid have been documented in our database. However, always consult a healthcare provider before combining supplements.