What are some ';Acids'; that should be present in a beauty creme or lotion for it to be beneficial to the skin?

Vitamin C and certain vitamins and especially were mentioned in Cosmo, although I can't remember, does anyone know what acids should be present in lotion or creme ?What are some ';Acids'; that should be present in a beauty creme or lotion for it to be beneficial to the skin?
Alpha hydroxy acids are common, too.

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