Generally, people who eat animal products several time per say don’t need to supplement with B12. But I remember reading that elders absorb it not as well and can’t rely even on animal products, and may need to supplement.

Yes, fortified nutritoonal yeast is a source too. One should make sure their nutritional yeast is fortified berfore relying on it for B12. If it’s not fortified with B12, it doesn’t contain any.

I use it in pesto in place of cheese and everyone, omnivores included, love it.