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Causes of Vitamin B12 Deficiency There are several reasons why an individual might become deficient in vitamin B12: Poor Absorption Some people have difficulty absorbing vitamin B12 from food or supplements due to factors such as age or certain digestive disorders

[2] Risk factors may occur possibly more in elderly people due to impaired intestinal absorption, and in children, premenopausal women, and pregnant women, whose diets are low in animal foods

PMID: 36588717

This can lead to a noticeable improvement in energy, cognitive function, and your general sense of wellness

High homocysteine levels are associated with increased risk of age-related macular degeneration