A Randomized, Double-blind, Split-face Study Comparing the Efficacy and Tolerability of Three Retinol-based Products vs. Three Tretinoin-based Products in Subjects With Moderate to Severe Facial Photodamage.
randomized, double-blind, split-face
EVIDENCE COMPARISON
DirectionalAdapinoid (Oleyl Adapalenate)
vs Tretinoin
for Pigmentation Reduction
Early or indirect evidence suggests adapinoid may reduce pigmentation 1.23x more effectively than tretinoin for improving skin tone, based on indirect comparison.
1.23x
Effect ratio
Adapinoid (Oleyl Adapalenate)
Favored
2
Studies
Indirect
Comparison
ExploratoryEstimated endpointTone
Limits: Indirect comparison · Includes estimated measurement · Early-stage evidence tier
This is an indirect comparison — the two ingredients were not tested head-to-head in the same trial. The ratio is derived from separate studies against a common comparator.
How to read this claim
Kept public as exploratory because it indirect comparison; includes estimated measurement; early-stage evidence tier.
Some study-specific context may affect how broadly this comparison generalizes.
1 linked trialIngredient trial