Vitamin B12 (Methylcobalamin)

B12 deficiency affects up to 20% of adults over 60 due to declining intrinsic factor production, and nearly all vegans require supplementation. Methylcobalamin, the bioactive form, supports nerve myelination, red blood cell formation, and DNA synthesis. Sublingual doses of 1,000mcg bypass absorption issues that make oral tablets ineffective for many older adults.