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Head-to-head evidence comparison — which supplement is right for you?
Alpha-Arbutin vs Cysteamine (topical): Cysteamine (topical) 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.
Cysteamine (topical) 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 Cysteamine (topical) 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. Cysteamine 5% cream is typically applied once daily to areas of melasma as a short-contact treatment (left on for ~15 minutes, then washed off) to limit odor and irritation, with daily sunscreen. There is no oral or systemic use in this context. This library does not provide an ingestion protocol.
Any time of day
Cysteamine 5% cream (short-contact application)
Throughout
8-12 weeks
Throughout
Throughout
Throughout
8-16 weeks
Throughout
Throughout
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
Evaluation of the efficacy of cysteamine 5% cream in the treatment of epidermal melasma: a randomized double-blind placebo-controlled trial.
Br J Dermatol (2015) · Rct · n=50
First double-blind placebo-controlled RCT of cysteamine 5% cream for epidermal melasma (n=50), nightly for 4 months
Efficacy of cysteamine cream in the treatment of epidermal melasma, evaluating by Dermacatch as a new measurement method: a randomized double blind placebo controlled study.
J Dermatolog Treat (2018) · Rct · n=40
Second double-blind placebo-controlled RCT (n=40), nightly cysteamine 5% for 4 months, with Dermacatch and Mexameter colorimetry
A comparative study of topical 5% cysteamine versus 4% hydroquinone in the treatment of facial melasma in women.
Int J Dermatol (2020) · Rct · n=40
Multicenter evaluator-blinded head-to-head of cysteamine 5% vs hydroquinone 4% (n=40), nightly for 120 days with sunscreen
Cysteamine (topical) has a higher evidence score (6/10 vs 4/10) and wins in 2 of 3 categories.
For even skin tone, Cysteamine (topical) has a higher relevance score (70 vs 60).
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.