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Vitamin B12 for Athletes: Dosing and Evidence (2026): The Short Answer Vitamin B12 (cobalamin) is essential for red blood cell production, oxygen delivery, and nerve function, all of which directly affect endurance performance
Healthy blood cells : Prevents anemia, which often causes weakness and low energy
Rubino D, Abrahamsson N, Davies M, et al
Key Takeaways: B12 shot effects stay for about one to two weeks Some people notice benefits lasting up to a month If absorption is an issue, weekly injections might be necessary Energy, mood, and metabolism can improve at different paces Your past health impacts how long the effects stay
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