Vitamin B12

Vitamin B12, or cyanocobalamin, is an essential cofactor for energy metabolism, the health of the nervous system, and the production of red blood cells. Deficiency is common, and not only in plant-based diets: absorption depends on intrinsic factor and healthy gut function, so aging, certain medications like metformin and PPIs, and gastrointestinal conditions can leave people low despite adequate intake. An injection bypasses the intestinal step entirely and delivers B12 directly, which is why it is used when oral supplements do not raise levels. The people who benefit most are those who are genuinely deficient; in someone already replete, the effect is smaller. B12 is water-soluble and very well tolerated. A licensed provider reviews your history and sets a schedule; compounded by a US-licensed pharmacy.