Myths vs facts: Homocystein and Sport

Homocysteine is a sulfur-containing amino acid; elevated levels are linked to cardiovascular risk. In sports, myths suggest that intense training lowers homocysteine or that B-vitamin supplements (B6, B12, folate) enhance performance. Facts: Moderate exercise can slightly reduce homocysteine, but effects are small and not performance-enhancing. Extreme endurance training may even transiently raise homocysteine. Evidence for sport relevance is weak—no RCTs show that lowering homocysteine improves sprint or strength performance. From a MyBody-X perspective: DNA tests for MTHFR variants (e.g., C677T) are often tied to homocysteine, but the single-gene effect is small and modifiable by diet (B vitamins). Athletes should not rely on such markers; instead, focus on balanced nutrition. Caveat: marketing often overstates the benefit of genetic tests for sports optimization. Evidence: unclear, as no direct studies are present in the provided context.