Our intermediate level serum has all the greatness of Retinoid 1, but with an active level of 0.5% hydroxypinacolone retinoate (HPR) and 0.05% retinal added. This has been developed for those accustomed to using vitamin A products who want to level up their routine, to maintain an even, radiant complexion. New to the world of retinoids? We created our entry-level Retinoid 1 serum especially for beginners.
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