B12 is naturally made by certain bacteria. B12 supplements are only unnatural or non vegan if fillers are added to the pill that make it so.
No plant or animal food produces vitamin B12 by itself. In animals, b12 comes from bacteria in feces they ingest or bacteria in their stomach.
Some plants with B12 have been grown in a lab, using soil that was rich in B12 producing bacteria.
B12 is made by growing a culture of B12 producing bacteria. Here is a list of bacteria that produce B12.
Acetobacterium, Aerobacter, Agrobacterium, Alcaligenes, Azotobacter, Bacillus, Clostridium, Corynebacterium, Flavobacterium, Lactobacillus, Micromonospora, Mycobacterium, Nocardia, Propionibacterium, Protaminobacter, Proteus, Pseudomonas, Rhizobium, Salmonella, Serratia, Streptomyces, Streptococcus and Xanthomonas.
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