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Intramuscular B12 Injection Sites Intramuscular (IM) injections yield better results and ensure faster absorption because the substance spreads directly to the muscle tissue
The shoulder Experienced doctors commonly administer B12 injections into the upper arm area by inserting the injection into the deltoid (shoulder) muscle
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Some patients report it as a less painful alternative because the needle that goes into the fatty tissue just below the skin is thinner and shorter, usually one-half to five-eighths of an inch long
Goodman clarifies
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