Vitamin B12's Complex Cancer Link: Balance Matters More Than Megadoses

Vitamin B12, long celebrated as a cornerstone of cellular health, reveals a more nuanced relationship with cancer than the simple logic of supplementation suggests. Research points to a U-shaped curve of risk — where deficiency and excess alike carry potential dangers — reminding us that the body is not a vessel to be filled but a system seeking equilibrium. Elevated B12 in cancer patients appears less a cause than a signal, a biochemical echo of disease already present. In this, B12 becomes a quiet lesson in the limits of abundance as a health strategy.