[jablala]

Amino acids - it's suboptimal to eat only one source of protein. I suppose more so on for a vegan. Just as well no one does that. Of they do you're no longer attributing "poor amino acid profiles" to veganism as you are to the person responsible for terrible diet.

B12 - Animal products come from animals filled to the brim with B12 supplements, of which a huge majority of global B12 supplements go towards livestock. Also along with over lovely concoctions of antibiotics and drugs.

There's nothing wrong with cutting out the middle-man! Not least when so many flesh eaters are also deficient in B12 themselves. In need of taking the same B-complex as vegans.