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Causes of vitamin B12 deficiency include food cobalamin malabsorption (low intestinal absorption of the vitamin from food) due to intrinsic factor receptor deficiency (a substance needed for absorption of B12), impaired calcium availability, gastrointestinal disorders such as chronic gastritis, Crohns disease, and other bowel inflammatory disorders, surgery on the digestive tract such as total or partial gastrectomy, or autoimmune conditions

It stimulates collagen and elastin production, improving skin firmness, reducing wrinkles, and enhancing would healing

The jury is out, to be honest: the body does indeed absorb Cyanocobalamin very well but Methylcobalamin is considered to be retained better and for longer out of the different types of vitamins

Additionally, recent studies have identified bacterial DNA in human and mouse adipose tissues 20,21

The Institute of Medicine has not established an upper limit for B12 intake, reflecting its low toxicity profile

This is because there are few vegan foods that contain B12 and also because the body finds it significantly more difficult to absorb B12 from the few vegan sources that have it