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Head-to-head evidence comparison — which supplement is right for you?
Niacinamide 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 Benzoyl Peroxide and Niacinamide have evidence — compare verdict strength side-by-side.
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. Niacinamide is typically formulated at 2-5% in leave-on serums, creams, or gels and applied to clean skin once or twice daily (AM and/or PM). It layers well under sunscreen and with most other actives. There is no oral, injectable, or systemic dose in this cosmetic context — it is not ingested here. This library does not provide an ingestion protocol.
any
Leave-on topical serum or cream (2-5% niacinamide)
Throughout
4-12 weeks
Throughout
First weeks
Throughout
4-12 weeks
2-12 weeks
2-8 weeks
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
Niacinamide: A B vitamin that improves aging facial skin appearance.
Dermatol Surg (2005) · Rct · n=50
Double-blind, left-right randomized split-face design: 5% niacinamide vs vehicle applied twice daily for 12 weeks in 50 white women with facial photoaging
The effect of niacinamide on reducing cutaneous pigmentation and suppression of melanosome transfer.
Br J Dermatol (2002) · Rct · n=18
Paired clinical trial: 18 subjects with hyperpigmentation used 5% niacinamide vs vehicle moisturizer (plus a separate facial-tanning arm)
A Double-Blind, Randomized Clinical Trial of Niacinamide 4% versus Hydroquinone 4% in the Treatment of Melasma.
Dermatol Res Pract (2011) · Rct · n=27
Split-face RCT in 27 melasma patients: 4% niacinamide vs 4% hydroquinone (HQ) for 8 weeks, both with sunscreen
Niacinamide has a higher evidence score (6/10 vs 9/10) and wins in 2 of 3 categories.
For clearer skin (acne), Benzoyl Peroxide has a higher relevance score (85 vs 55).
No known interactions between Benzoyl Peroxide and Niacinamide have been documented in our database. However, always consult a healthcare provider before combining supplements.