what's in b12 injections Where Can You Inject Where is the best place to inject a B12 shot? Give your body the boost

As with any injection, minor soreness at the injection site may occur

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You're currently receiving medication or treatments that affect bone marrow

However, some find absorption issues persist due to digestive factors or medication use

Reddit threads on r/Biohackers describe it landing between weeks 3 and 5 most often

The injection : administered into your deltoid (upper arm) or, occasionally, the upper outer hip, by a licensed nurse practitioner or trained medical assistant under nurse-practitioner supervision