People over 60, vegans, and vegetarians often need B12 shots, and the amount needed is measured in micrograms (mcg) and will depend on your age and the conditions that necessitate it
User reports from thousands of self-experimenters describe mild nausea, occasional headache, and injection site redness as the most common complaints
10.1080/10245332.2018.1456023 [DOI] [PubMed] [Google Scholar] Sharabi A., Cohen E., Sulkes J., Garty M
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Because of the low toxicity of vitamin B12, no tolerable upper intake level was set by the Food and Nutrition Board in 1998 when the RDA was revised
The most common ingredients include Vitamin B12, Methionine, Inositol, and Choline