Vitamin B12 is used to strengthen the nerves protrectice layer. It is not found in nature, it is produced by a bacterium. Today because of the antibiotic overuse in farms, animals are doped in vitamin B12 for us to ingest by eating meat. Being vegetarian, I do not eat meat, I compensate the treatment received by the animals myself taking this product. Warning vitamin B12 is a necessary and vital vitamin.