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Absorption of vitamin B 12 is strictly regulated, and the body is not able to absorb more than 24 g/day
Adverse Reactions/Side Effects The following serious adverse reactions are described elsewhere in the labeling: Severe Optic Atrophy in Patients with Lebers Disease [see Warnings and Precautions (5.1)]
It is also banned by the World Anti-Doping Agency (WADA).
Clinical Trials: Impact of B12 Supplementation on Metabolites Serum B12 Holotranscobalamin Methylmalonic Acid Homocysteine Notes on Clinical Trials of B12 Supplementation Appendix C
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