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Also, patients should be warned about the danger of taking folic acid in place of Vitamin B12, because the former may prevent anemia but allow progression of subacute combined degeneration

Brewer's yeast is naturally rich in B vitamins and iron

Many protocols performed in hospitals in Brazil that receive patients affected by COVID-19 recommend supplementation or intramuscular injection of vitamin B 12 in cases where a deficiency or subclinical deficiency of vitamin B 12 is identified

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There are also certain drugs and health conditions that can increase the likelihood of developing a B12 deficiency, such as: alcohol abuse, antacid use, smoking, celiac disease, other digestive concerns, pregnancy, a strict vegetarian or vegan diet, and even natural aging