What role does B12 play in skin aging?

Vitamin B12 (cobalamin) is crucial for DNA synthesis, cell division, and methylation – processes that also affect skin health. Deficiency leads to elevated homocysteine, which promotes oxidative stress and may damage collagen and elastin, contributing to premature skin aging. Clinically, B12 deficiency is associated with hyperpigmentation, vitiligo, and accelerated aging signs. However, evidence for a direct anti-aging benefit of B12 supplementation in non-deficient individuals is weak. Most data come from observational studies or case reports; robust randomized controlled trials on skin aging are lacking. The provided context does not contain specific information on B12 and skin aging. Therefore, a conservative assessment is warranted: maintaining adequate B12 status is important, but excess intake does not confer additional skin benefits. Supplementation is justified in vegans or those with malabsorption (e.g., gastric bypass, atrophic gastritis), but not primarily for anti-aging. Safety note: very high doses are generally safe but may rarely exacerbate acne or rosacea.