injecting b12 into arm Injections at Home - Safety Guide for Self-Administration How to Give B12 Injections
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doi:10.1016/s0022-3476(88)80114-8

Although extremely rare, hydroxocobalamin injections can also cause serious side effects such as a major allergic reaction or irregular heartbeats (palpitations)
Length: The length of the needle is another crucial factor to consider
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