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Dietary patterns Many people can meet their vitamin B12 requirements through diet

The United States Food and Nutrition Board Some injection courses may provide up to 7 daily doses of 100 mcg, or up to 1000 mcg at once

however, for some patients, its more beneficial to receive them weekly

This is because they dont need to be digested, which avoids the risk of low absorption

You might feel very thirsty, tired, dizzy, and lightheaded, or you may have a headache

People with normal liver function store 50% of their vitamin B12 in their liver, so if your liver is not functioning properly, you may need more vitamin B12 shots than those whose livers are working as designed