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Head-to-head evidence comparison — which supplement is right for you?
Benzoyl Peroxide vs Finasteride (topical): Benzoyl Peroxide has the stronger overall evidence (9 vs 6.5/10); the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Benzoyl Peroxide wins 3 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
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
Apply finasteride 0.25% topical solution to the scalp once daily. Lower applied volumes reduce serum DHT less while still cutting scalp DHT substantially.
evening
Finasteride 0.25% topical solution
Throughout
4-12 weeks
Throughout
First weeks
immediate
24 weeks
24 weeks
1 week
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
Efficacy and safety of topical finasteride spray solution for male androgenetic alopecia: a phase III, randomized, controlled clinical trial
J Eur Acad Dermatol Venereol (2022) · Rct · n=458
The pivotal trial: phase III, double-blind, DOUBLE-DUMMY, so it compares topical against placebo AND against oral finasteride in the same study.
Effects of a novel finasteride 0.25% topical solution on scalp and serum dihydrotestosterone in healthy men with androgenetic alopecia
Int J Clin Pharmacol Ther (2016) · Rct · n=50
⚠️ THE CAVEAT THAT MATTERS: serum DHT fell 60-70%. "Topical avoids systemic exposure" is not what this study shows at the higher doses.
Comparing the therapeutic effects of finasteride gel and tablet in treatment of the androgenetic alopecia
Indian J Dermatol Venereol Leprol (2009) · Rct · n=45
A direct head-to-head of gel against tablet, double-blind and double-dummy, six months.
Benzoyl Peroxide has a higher evidence score (9/10 vs 6.5/10) and wins in 3 of 3 categories.
No known interactions between Benzoyl Peroxide and Finasteride (topical) have been documented in our database. However, always consult a healthcare provider before combining supplements.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.