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Systemic symptoms such as vomiting, poor feeding, strabismus, macrocephaly, hypotension, respiratory distress, microcephaly, thrombosis, E

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however, more research is needed to further deter-mine if exercise increases the need for folate and vitamin B-12 6 Dosage for Pre-Workout Given the lack of successful studies, there is no recommended dosage for vitamin B12 as a pre-workout aid Pre-workout formulas supply anywhere from 1.2 to 50 mcg of vitamin B12 per serving Standalone vitamin B12 supplements offer doses ranging from 500 to 6000 mcg Side Effects Vitamin B12 may cause diarrhea and other minor side effects in some people, but is otherwise perfectly safe

doi: 10.1210/en.2007-0239

Foods rich in vitamin B12 also contain high levels of histamine, which can trigger a reaction

This autoimmune condition attacks the intrinsic factor, a protein your stomach makes that's required for B12 absorption