LifeExtension Vitamin B12 | 500 mcg, 100 lozenges
Vitamin B12 is present in foods of animal origin, including dairy products and eggs. Thus, vegetarians are more susceptible to a dietary deficiency of this important nutrient.232 Likewise, vitamin B12 serum concentrations are reported to be significantly lower in elderly population groups compared to younger groups.233-236 It is estimated that 10% to 30% of individuals over the age of 50 have low stomach acid secretion237,238 which results in decreased bioavailability of vitamin B12 from food. To overcome food-bound vitamin B12 malabsorption problems, the Institute of Medicine recommends that vitamin B12-fortified foods (such as fortified ready-to-eat breakfast cereals) or supplements containing vitamin B12 be used to meet much of the requirement.239 Vitamin B12, or cobalamin, works synergistically with vitamin B6 and folate to regenerate (methylate) the amino acid methionine, which helps to maintain already healthy homocysteine levels within normal range, which is important for heart health.240-243
Cyanocobalamin is a synthetic and inexpensive form of vitamin B12 that is converted in the body to its bioactive forms, methylcobalamin and cobamamide.