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This compound is not approved by the FDA for human use and is not intended for human consumption or self-administration

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However, two other forms hydroxocobalamin and cyanocobalamin become biologically active after they are converted to methylcobalamin or 5-deoxy adenosylcobalamin, said Dr Aravinda G M, consultant, internal medicine, Manipal Hospital, Jayanagar, Bangalore

Malabsorption Issues : If you have conditions like pernicious anemia, Crohns disease, or have had weight loss surgery, vitamin B12 injections may be a more effective option due to the bodys difficulty absorbing B12 through the digestive tract