EVIDENCE CATALOG

What the research actually says.

Every summary links to the original study. Scored by rigor. Updated as new research publishes.

TIER 1 — RCT-PRIORITY

Retinol 0.5% vs Bakuchiol 1% for photoaging

Dhaliwal et al., 2019 · n=44 · 12 weeks Br J Dermatol

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TIER 2 — STRONG

Niacinamide 5% for hyperpigmentation in darker skin tones

Navarrete-Solís et al., 2011 · n=52 · 8 weeks Dermatol Res Pract

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TIER 2 — RCT-PRIORITY

Vitamin C 15% serum for UV-induced damage prevention

Lin et al., 2003 · n=30 · 16 weeks J Am Acad Dermatol

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TIER 3 — SUPPORTIVE

Azelaic acid 15% for rosacea-associated erythema

Thiboutot et al., 2003 · n=40 · 12 weeks Cutis

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