Thank you for the replies. I have been trying to create a doubt about the "B12 must come from animal products" issue belief since I started exploring plant-based diets. I have managed to find that everything a human needs can be obtained “naturally” from fruits, vegetables, beans and nuts - except B12. It is an essential nutrient for humans so I am trying to figure out how we maintained a supply of B12 before the advent of vitamin supplements. The answer always seems to come full circle back to animal products. Of course, today it is a very different type of food supply of animal products than it was 100 years ago. Today these food sources are polluted with steroids, antibiotics, preservatives, etc and are produced in a way that should bring great shame to humans.
In any event, these are my questions so far:
1. If we get our B12 from animals, where do they get their B12 from? In other words, the animals we get our B12 from are mostly vegetarian ie; cows, pigs, chickens, etc. Are they getting it from vegetation or do their bodies produce B12?
2. If they are getting it from vegetation, why can’t we get it from vegetation, especially being on a plant-based diet?
And further, with respect to number 1 above, it’s interesting that most humans are not getting B12 from animals that are meat eaters i.e. lions and tigers, but rather from animals that are vegetarians/vegans. It’s all very thought provoking and interesting. I don’t know what it all means.
Thanks for the replies. And yes, I'll take any links you have that can shed light on this.
This is an issue I've lost interest in since vegan forms of B12 are highly available. That said, I'm sure you can find lots of information quickly with a Google search. PETA, Vegan Outreach, Compassion over Killing, and many other groups have FAQ sections. Animal Liberation Front has a bad reputation in many circles but they have a gigantic FAQ section that I'd definitely expect would address this issue. You might want to look at their whole FAQ section actually.