Myths vs facts: B12 and Sport

The topic of myths vs. facts about vitamin B12 in sports is often debated. A common myth is that B12 supplements directly boost athletic performance regardless of baseline levels. In reality, B12 is crucial for energy metabolism, red blood cell formation, and nerve function. Deficiency can cause fatigue and impair performance, but supplementation in non-deficient individuals shows no ergogenic benefit. Evidence for a direct performance-enhancing effect is weak. Another myth claims B12 injections are superior to oral forms. Research indicates that oral supplementation is equally effective when absorption is intact. Athletes following vegan or vegetarian diets are at higher risk for deficiency, as B12 is primarily found in animal products. A blood test (e.g., holotranscobalamin) is advisable before supplementing. The provided context lacks specific studies on B12 and sport, so this answer relies on established medical knowledge. Safety note: high-dose B12 is generally safe, but unnecessary supplementation is not recommended.