Hydroxypinacolone Retinoate (HPR)

Hydroxypinacolone retinoate — better known as granactive retinoid or tretinoin ester — is a next-generation retinoid that binds directly to retinoid receptors without requiring conversion to retinoic acid. This grants it near-retinoic-acid activity with a fraction of the irritation. Clinical testing of HPR shows reduced fine lines and improved texture at 0.2–0.5% with minimal peeling or redness. It is photostable, works at physiological pH, and layers well with ceramides and peptides. HPR suits retinol-experienced users seeking stronger results without prescription tretinoin, and sensitive users who failed classic retinol. As with all retinoids: night use, moisturiser, daily SPF, and avoidance during pregnancy.