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
DirectionalGlycolic Acid
vs Retinol
for Pigmentation Reduction
Early or indirect evidence suggests glycolic acid and retinol show similar effectiveness for reducing pigmentation and improving skin tone, based on indirect comparison.
1.00x
Effect ratio
Neither
Favored
2
Studies
Indirect
Comparison
ExploratorySubjective endpointTone
Limits: Indirect comparison · Includes subjective endpoint · 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 subjective endpoint; early-stage evidence tier.
Some study-specific context may affect how broadly this comparison generalizes.
1 linked trialIngredient trial
Source Studies (2)
Comparison between 1% tretinoin peeling versus 70% glycolic acid peeling in the treatment of female patients with melasma.
randomized, double-blind