Sente retinol3/17/2024 ![]() (Note: In Canada, HPR is no longer allowed over the counter, as it is now classified as a tretinoin derivative.) Although the strength is comparable to a prescription retinoid, it produces little to no irritation. Hydroxypinacolone retinoate: Another retinoic acid ester (also known as "granactive retinoid" when combined with the solvent dimethyl isosorbide). ![]() Retinyl retinoate: A retinoic acid ester that is eight times more active than retinol, with less irritation.It's usually found in a 0.05% or 0.1% concentration. It's not only stronger than retinol, it also works 11 times faster. ![]()
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