The purpose of the present invention is to provide a skin collagen production promoter which has no problem in safety. Another purpose of the present invention is to provide a food or drink for promoting skin collagen production and a cosmetic for promoting skin collagen production, said food or drink and cosmetic containing the aforesaid substance.TGF-β and/or a TGF-β digestion product, which is obtained by digesting TGF-β with a protease such as pepsin, pancreatin, etc., are used as a skin collagen production promoter or the active ingredient of a food or drink for promoting skin collagen production and a cosmetic for promoting skin collagen production. The aforesaid TGF-β and/or TGF-β digestion product have an effect of increasing the collagen content of the skin.
