Humans cannot make their own vitamin B12, and, since plants have no need for this vitamin, they do not produce it, so the only dietary sources of it are in meat, dairy, seafood, arthropods, other animal-derived foods, and vitamin supplements. Vegans, take note: you need these pills. But what about vegetarian animals? There are many animals that eat only plants, but if plants don’t have any B12 and all animals need B12 to survive, how do cows, sheep, horses, and the thousands of other herbivorous animals avoid anemia? The answer is that they make it—or, rather, the bacteria in their large
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