I often get asked if B12 is just a concern for vegans. The answer? Not at all. Even if you eat meat or dairy, there's no guarantee you're absorbing enough, especially as Many people believe that vitamin B12 is only found in animal products, but that's a misconception. B12 is actually produced by bacteria in the soil, and animals get their B12 by consuming People love to bring up B12 like it's a reason to eat meat. But here's the irony Even meat eaters can be deficient in B12. That's because B12 comes from bacteria in The Advantages of B12 Injections Versus Oral Supplements: Shawn Veiseh, M.D.: Family Medicine Vitamin B12 The Nutrition Source Vitamin B12 Dosage: What Is the Proper Daily Amount? Dr. Axe