Glycerin sits in our formulas for one job: holding water in the skin. We file it under Hydration in this glossary because that is the effect its evidence actually supports, not because it is the most flattering label available.

Water in the depths

The mechanism is the one stated in the summary above, and we have deliberately not extended it. Where a supplier or a competitor would reach for a bigger promise, the sentence we publish stops where the research stops.

Water in the evidence

Our source is a peer reviewed randomized controlled trial, recorded as Breternitz 2008 PMID 18025807. You can read it yourself at PubMed 18025807. We grade that as solid support for what the ingredient does.

Water and its limits

The research behind Glycerin studies the ingredient, not the finished Opuliss product it sits in. It supports what Glycerin does. It is not a trial of our formula, and we will not present it as one.

Cosmetic claims describe how skin looks and feels. Nothing here is a medical claim, and nothing here treats a condition.