b12 injections im or sc Sublingual vs. B12 Injections: Which Option Is Right for You? – WhyNotNatural Treating Severe Vitamin B12 Deficiency

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doi: 10.1126/sciadv.abn1382 48 ZhanYJiangLJinXYingSWuZWangLet al

Only a medical professional should use this site because it's really close to major blood vessels and your sciatic nerve (which could be damaged if the injection is not administered properly)

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