The honest position on human evidence is that it is thin
This step-by-step guide is designed to help you understand the general process, but remember, the specifics might vary based on your medication and device
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Large amounts of B-12 are found in such foods as fish and beef, with smaller amounts in dairy products like cheese, yogurt, and eggs
If you take a daily B12 supplement or multivitamin and your levels are mildly elevated (900 to 1,200 pg/mL), the most likely explanation is the supplement
If you take vitamin B12 supplements, let your doctor know so they can tell you how much you need, and make sure they won't affect any medicines you're taking