Vitamin B12 is a nutrient that your body doesn't make, so you have to get it from animal products, such as meats, dairy, and eggs, or from supplements
As for safety, tolerable upper intake levels (known as ULs) are set for vitamins and minerals when evidence is sufficient
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The CAS registry number 63-39-8 anchors the canonical chemical identifier
Studies show REV-ERB and REV-ERB nuclear receptors control circadian rhythm and metabolic genes
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