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Those most at risk of a Vitamin B12 deficiency include elderly people, those who follow a vegetarian or vegan diet, people who have had intestinal surgery and people with diseases of the gut, such as Crohn's Disease or Celiac Disease

A: Coverage varies by insurance plan and medical necessity

In general, evidence from RCTs does not show that vitamin B12 supplementation alone or with folic acid, vitamin B6, or both for 1 to 2 years improves cognitive function in older adults with or without dementia, mild cognitive impairment, or Alzheimers disease, even though supplementation lowers homocysteine levels [93-96]

Longitudinal association between IGFBP-1 levels and parameters of the metabolic syndrome in obese children before and after weight loss

Supplements that only contain vitamin B12 typically have the highest doses of the vitamin, while multivitamin/mineral supplements and supplements that combine vitamin B12 with other B-complex vitamins usually contain lower doses