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It may be time to consider a Vitamin B12 injection if you are experiencing common symptoms, including: Weakness, fatigue, or lightheadedness Heart palpitations Pale skin Mouth or tongue soreness or bleeding Constipation, diarrhea, loss of appetite, or gas Numbness or tingling, muscle weakness, and problems walking Vision loss Possible depression, memory loss, or behavioral changes Anemia Intestinal disorders and weight loss Vitamin B12 injections can potentially treat anyone experiencing symptoms associated with a deficiency
US Department of Health and Human Services, National Institutes of Health, Office of Dietary Supplements
It falls under S2: Peptide Hormones, Growth Factors, and Related Substances , alongside GH, GHRPs, and IGF-1 analogs