Why would strange and unnatural be a problem? And if it were dangerous, it wouldnt be aproved.
Either way, i hope you make sure to get enough lab created vitamin B12 (i think its still created by the same bacteria which usualy create it, just not inside an animal, i might be wrong and i dont care either way). I dont want to hear more stories about crazy people besmirching vegetarian or vegan diets due to their esoteric nonsense.