Retinoids a.k.a. Vitamin A, and that’s why retinoids are an important part of nutrition, for our whole body including our skin.  Vitamin A has been recognized as such since 1920, and it is required for vision, skin health, immune function, bone metabolism and, notably. embryonic development (that’s why excess vitamin A can affect embryonic development).  The carotenes alpha, beta, and gamma can be transformed into vitamin A within our body. Why so many? For retinoids to work they must bind to the retinoid receptor in the nuclear membrane. Slightly different molecules can do that and all will have Vitamin A activity. But not all retinoids are the same. Some chemicals … Continue reading Retinol, retinoic acid, retinyl ester, retin-A…… why so many retinoids?