While this sounds great, it's crucial to remember the limitations
Remember that vitamin B12 must attach to a protein called intrinsic factor, which is secreted in the stomach to be absorbed
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Some clinicians have reported successful use of small-volume subcutaneous injections, yet the formulation is approved and most widely studied for deep intramuscular delivery, so any off-label route should be discussed carefully with the prescriber
Typical Dosage Range Most men with low vitamin B12 levels receive around 1,000 mcg per injection, depending on their blood levels and health goals.( 9 ) However higher doses, as much as 2,000 mcg can also be safe in some cases
Sources NIH Office of Dietary Supplements, Vitamin B12 Fact Sheet NIH Office of Dietary Supplements, Choline Fact Sheet MedlinePlus, Cyanocobalamin Injection Mayo Clinic, Vitamin B12 Injections and Weight Loss NCBI Bookshelf, Essential Amino Acids PubMed, Inositol Phosphate Signaling Network The American Journal of Clinical Nutrition, Lipotropic Agents and Lipid Transport