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Head-to-head evidence comparison — which supplement is right for you?
Alpha-Arbutin vs Glycolic Acid: Glycolic Acid has the stronger overall evidence (6 vs 4/10); they're alternatives for even skin tone — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Glycolic Acid wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Too few graded studies
Top outcomes
Verdict
Too few graded studies
Top outcomes
Shared outcomes (1)
Outcomes where both Alpha-Arbutin and Glycolic 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. (the one cited trial tested alpha-arbutin only inside a combination cream, at 5% with 2% kojic acid, and it did not differ from triple combination cream on mMASI or melanin index)
Any time of day
Leave-on topical serum (≈1-2% alpha-arbutin)
Topical cosmetic only. Leave-on glycolic acid is used at roughly 5-15% in lotions/serums (often at low pH), applied to clean skin a few nights per week and building as tolerated; professional peels (20-70%) are applied in-office at intervals. There is no oral, injectable, or systemic dose — it is not ingested. Pair with daily sunscreen. This library does not provide an ingestion protocol.
Evening
Leave-on lotion or serum (≈5-15% glycolic acid)
Throughout
8-12 weeks
Throughout
Throughout
Throughout
8-12 weeks
8-16 weeks
First weeks
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
A double-blind randomized clinical trial on the effectiveness of a daily glycolic acid 5% formulation in the treatment of photoaging.
Dermatol Surg (1998) · Rct · n=75
75 volunteers applied 5% unneutralized glycolic acid cream or placebo to face and neck daily for 3 months (double-blind, randomized, placebo-controlled)
Clinical improvement of photoaged skin with 50% glycolic acid. A double-blind vehicle-controlled study.
Dermatol Surg (1996) · Rct · n=41
41 volunteers received a 50% glycolic acid peel vs vehicle weekly for 4 weeks (in-office peel strength)
Mode of action of glycolic acid on human stratum corneum: ultrastructural and functional evaluation of the epidermal barrier.
Arch Dermatol Res (1997) · Open label
Electron-microscopy study of human skin after 3 weeks of 4% glycolic acid twice daily
Glycolic Acid has a higher evidence score (6/10 vs 4/10) and wins in 2 of 3 categories.
Both Alpha-Arbutin and Glycolic Acid score equally (60) for even skin tone.
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
The depigmenter playbook (hydroquinone, azelaic, tranexamic, vitamin C) with sunscreen as the spine.
AM/PM order, what to combine vs separate, and why sunscreen always comes first.
The proven core (sunscreen, retinoids, vitamin C) vs the viral hype tier — honestly tiered.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.