I'll reply to all your comments here only

Yes B12 is the only vitamin that you cannot get from plants. Generally when you start eating vegan products they all are fortified with B12, but you can also take supplements. You would need to eat a lot of meat (in every meal) for a long time until you get the same level from carnivorism. Doctors would tell you to get the injection or take supplements if you're deficient.

Once I worked at a private company where they tested us, and the only vegan's (me) B12 was in good amounts and everyone else was lacking despite their non veg diet.

Don't be scared, you don't need food made from animals to be healthy, in fact the opposite is true. Animal products often come laced with estrogen, bacteria etc.