Myths vs facts: B12 and Langlebigkeit

Myths vs facts: B12 and longevity. Vitamin B12 is crucial for nerve function and red blood cell formation, but direct longevity extension from B12 alone lacks strong human evidence. Deficiency, common in older adults, can cause fatigue and cognitive decline, indirectly affecting healthspan. Genetic variants like FUT2 rs601338 (non-secretor) modestly reduce B12 absorption, but this does not guarantee deficiency or shorten lifespan. Longevity is multifactorial; B12 is one piece. Caveat: MyBody-X tests are lifestyle self-tests, not medical diagnostics. High-dose B12 without lab confirmation is unnecessary. Evidence: human-moderate (B12 deficiency in elderly), mechanistic (FUT2).