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Compounded methylcobalamin injections may be prescribed by a licensed healthcare provider for patients with clinically appropriate vitamin B12 deficiency or when injectable vitamin B12 supplementation is considered medically appropriate
PubMed World Anti-Doping Agency
Whilst B12 plays an essential role in energy metabolism, red blood cell production, and nervous system function, there is no evidence that supplementation increases energy in individuals with normal B12 status
Phase 1: Days 1-15 (1 mg/day) During the first 15 days, the dose is 4 units on an insulin syringe, which equals 1 mg per injection
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