b12 injection name list Cyanocobalamin USP 1000 mcg/mL Compounded Cyanocobalamin (Vitamin B12) Injection

No human safety data : The complete absence of human clinical trials means the safety profile, side effects, optimal dosing, and pharmacokinetics in humans are entirely unknown Animal-to-human translation is uncertain : Metabolic differences between mice and humans mean that the magnitude of effects (e.g., weight loss, grip strength improvement) may not translate

This, in part, reflects the challenge and mistrust of the medical establishment, which worsened during the Covid pandemic, but was already showing strong signs of opposition by the wide adoption of supplements (with a very similar lack of supportive data on efficacy and safety) long before 2020

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Common effects usually mild and often worst during titration include nausea, vomiting, diarrhea, constipation, abdominal pain, upset stomach, headache, and fatigue