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Head-to-head evidence comparison — which supplement is right for you?
Sunscreen (SPF) 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
Shared outcomes (1)
Outcomes where both Salicylic Acid (topical) and Sunscreen (SPF) have evidence — compare verdict strength side-by-side.
Topical OTC use. Leave-on and wash-off acne products contain 0.5-2% salicylic acid, applied to affected areas once or twice daily and built up as tolerated; professional peels (20-30%) are applied in-office. There is no oral or systemic dose in this context — it is not ingested (and large-area/high-concentration use can cause systemic salicylate absorption, so follow label limits). This library does not provide an ingestion protocol.
any
Leave-on or wash-off acne product (0.5-2% salicylic acid)
Topical OTC. Apply a broad-spectrum SPF 30+ sunscreen daily to sun-exposed skin as the last step of a morning routine, using an adequate amount (about 2 mg/cm² — roughly a nickel-sized dollop for the face, a shot-glass for the body) and reapply every ~2 hours of sun exposure and after swimming/sweating. Mineral (zinc oxide / titanium dioxide) filters are preferred if you're concerned about systemic absorption. There is no oral or systemic dose — it is not ingested. This library does not provide an ingestion protocol.
morning
Broad-spectrum SPF 30+, applied daily; mineral (zinc oxide/titanium dioxide) if concerned about absorption
Throughout
4-12 weeks
4-12 weeks
Throughout
Throughout
Ongoing (years)
Ongoing
Throughout
Comparison of alpha- and beta-hydroxy acid chemical peels in the treatment of mild to moderately severe facial acne vulgaris.
Dermatol Surg (2008) · Rct · n=20
Split-face, double-blind RCT (n=20) comparing 30% salicylic acid vs 30% glycolic acid peels, six treatments at 2-week intervals
Comparison of chloroxylenol 0.5% plus salicylic acid 2% cream and benzoyl peroxide 5% gel in the treatment of acne vulgaris: a randomized double-blind study.
Drugs Exp Clin Res (2003) · Rct · n=37
12-week double-blind RCT (n=37) comparing a 2% salicylic acid (plus chloroxylenol) cream vs benzoyl peroxide 5% gel twice daily
Comparative study of efficacy and safety of 45% mandelic acid versus 30% salicylic acid peels in mild-to-moderate acne vulgaris.
J Cosmet Dermatol (2020) · Rct · n=50
Randomized trial (n=50) of 30% salicylic acid vs 45% mandelic acid peels, six sessions over 12 weeks for mild-to-moderate acne
Sunscreen and prevention of skin aging: a randomized trial.
Ann Intern Med (2013) · Rct · n=903
Randomized community trial (n=903): the daily sunscreen group showed no detectable increase in photoaging (skin microtopography) after 4.5 years
Molecular mechanisms of photoaging and its prevention by retinoic acid: ultraviolet irradiation induces MAP kinase signal transduction cascades that induce Ap-1-regulated matrix metalloproteinases that degrade human skin in vivo.
J Investig Dermatol Symp Proc (1998) · Review
Mechanistic model: UV activates MAP-kinase pathways and AP-1, which upregulate matrix metalloproteinases (MMPs)
Daily Use of a Facial Broad Spectrum Sunscreen Over One-Year Significantly Improves Clinical Evaluation of Photoaging.
Dermatol Surg (2016) · Open label · n=32
Single-arm prospective study (n=32): broad-spectrum SPF 30 applied daily to the face for 52 weeks
Sunscreen (SPF) has a higher evidence score (9/10 vs 5/10) and wins in 3 of 3 categories.
For even skin tone, Sunscreen (SPF) has a higher relevance score (75 vs 50).
No known interactions between Salicylic Acid (topical) and Sunscreen (SPF) have been documented in our database. However, always consult a healthcare provider before combining supplements.