have you ever looked at millcreek botanicals, at vitaminshoppe stores? many of their conditioners list keratin, collagen, panthenol, and other proteins as the second ingredient after water
but i think its just keratin, not sure about the "human" part.
Hair type: 3a, fine, porous (too much hair dye on lengths), hennaed
Products i love so far: devacare low-poo, gftn, yes to tomatoes, yes to carrots, burt's bees shea and grapefruit DT, oc, millcreek botanicals biotin conditioner aveda be curly style prep and curl enhancer, cjdf, ciab, bb fsg, bb styling mud, angel, cccclite