Populations at a higher risk of vitamin B12 deficiency include people who are vegetarian or vegan, exclusively breastfed infants of vegan women, older adults, those with gastrointestinal disorders or who have had gastrointestinal surgery, and people with an autoimmune condition known as pernicious anemia
NHS.uk.
Its considered the most versatile of all vitamins due to its vast range of abilities, including influencing fundamental nerve functions, processing carbs and fats, forming red blood cells, and producing DNA
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Its important to tailor the frequency and dosage of B12 injections to individual health needs and under medical supervision
A Danish research group produced a series of reports examining MMA levels in people suspected of mild B12 deficiency