b12 injections side effects mayo clinic Shots: Benefits, Uses, Safety, Cost & How They Work Feeling worse after B12 Injection:

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However, one study on the treatment of children with methylmalonic acidemia and homocystinuria found oral hydroxocobalamine at 1 mg daily to be ineffective in reducing levels of homocysteine

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It supports the health of your nervous system by maintaining the protective covering (myelin) around your nerves

B12 plays many important roles in the human body, including: Nerve function Brain health Red blood cell production DNA synthesis Energy production Some people simply do not get enough Vitamin B12 in their diet to meet the bodys demands, while others have difficulty absorbing it

While high-dose oral tablets (1,000 mcg+) can work for some via "passive diffusion," the IV route bypasses the entire digestive system