Journal ArticleRandomized Controlled TrialInternational journal of molecular sciences·Aug 2026
Doubling Your Retinol Strength Didn't Double the Results on Skin
Key Insight
This study suggests lower-strength retinol may deliver similar barrier benefits with less irritation.
Women aged 40 to 61 used facial creams with either 0.104% or 0.247% retinol for 12 weeks. Both strengths improved hydration, barrier function, skin brightness, pH, and oiliness by about the same amount. The stronger cream smoothed skin better but caused more redness. Firmness and elasticity didn't budge with either, which fits retinol's slow remodeling timeline.
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