I don't know what specifically you mean by "natural", but there are organic, non-gmo bacteria and algae based b12 supplements.
Personally, I'd have no problem referring to those supplements as natural supplements. They're certainly not artificial or processed more than something like natural flour (unless you also consider something like wheat flour to be a non-natural, processed food. Then I think that logic makes sense if you're all about paleo-type food being the only natural food). YMMV.
At any rate, one of the most intelligent appellate attorneys I had the privilege of working with in California was vegan for years when I met him. It's too bad I don't have his contact info anymore. Trailblazing people usually have much knowledge to share with the rest of us. Trailblazing in the sense that unlike diary-only vegetarianism, which has been proven to be viable without major health concerns for thousands of years by generations of people - see Jains & Jainism - veganism doesn't have hundreds/thousands of years long track record over a number of generations. It's definitely exciting times to be alive from a dietary perspective.
Personally, I'd have no problem referring to those supplements as natural supplements. They're certainly not artificial or processed more than something like natural flour (unless you also consider something like wheat flour to be a non-natural, processed food. Then I think that logic makes sense if you're all about paleo-type food being the only natural food). YMMV.
At any rate, one of the most intelligent appellate attorneys I had the privilege of working with in California was vegan for years when I met him. It's too bad I don't have his contact info anymore. Trailblazing people usually have much knowledge to share with the rest of us. Trailblazing in the sense that unlike diary-only vegetarianism, which has been proven to be viable without major health concerns for thousands of years by generations of people - see Jains & Jainism - veganism doesn't have hundreds/thousands of years long track record over a number of generations. It's definitely exciting times to be alive from a dietary perspective.