Evidence shows that oral supplementation at a high dosage of 1000 mcg is an effective technique for increasing vitamin B12 levels in deficient individuals
Too little produces minimal effect
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As we age, our stomachs produce less hydrochloric acid or stomach acid, which is needed to absorb B12
Why Its Not Ideal for Self-Injection While the upper arm is a convenient spot for a professional, its not the best choice if youre administering the shot yourself
Nutrients found in multivitamins, such as zinc , chromium , and copper, and other nutritional supplements, such as prenatal vitamins, iron supplements , and cold remedies like zinc lozenges, are all potential causes of a metallic taste in your mouth