Opti B12 1200 mcg is a sustained-release vitamin B12 supplement that is suitable for vegans and vegetarians and may help prevent dietary deficiency of B12. Vitamin B12 assists in healthy red blood cell production and helps relieve tiredness and fatigue. Vitamin B12 also helps support healthy immune and nervous system function. Sustained-release methylcobalamin. With 1200 micrograms per tablet, allows for flexible dosing of vitamin B12. Uses the active methylcobalamin form of B12 for efficient and effective results. Vegan-friendly formula. Ideal for supplementing B12 deficiency states for vegans, vegetarians, the elderly and those who have difficulty absorbing vitamin B12 from food.