Abstract: Cosmetic formulations and compositions customized and/or personalized for rejuvenation of skin and/or hair are described. The cosmetic formulations are customized and/or personalized to include an extract and/or one or more molecular components in amounts and ratios naturally produced by rejuvenated cells or by cells modified toward rejuvenation. These cells are of skin and/or hair origin that have been reprogrammed, in which the skin and/or hair cells, having been rejuvenated and/or modified from the original cell, are initially obtained from a subject for which a customized cosmetic composition is for, or from a subject representative of a person for which a customized cosmetic composition is for.