Doubling Your Retinol Strength Didn't Double the Results on Skin
Graded Moderate — randomized single-blind trial in 38 women over 12 weeks, though only 28 were in the main comparison and the imaging and biomarker sub-studies had just 5 participants each.
- Design
- Randomized Controlled Trial
- Participants
- 38
- Duration
- —
- Funding
- —
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.
Disclaimer: Research summaries are provided for informational purposes only and do not constitute medical advice. Always consult a qualified healthcare professional before making changes to your health routine.