substitute

Yep. Goatein™.

"A unique blend of goat’s milk protein made with goat’s milk colostrum."

"Predigested" gives me the mental image of the mother goat flying back to the nest, where she perches on the edge, opens her beak, and regurgitates into the baby goats' welcoming mouths. Sorry for the wide distribution.

I guess it's just a protein that some health food people like, but not from cows.