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What to Expect Before Getting a B12 Shot A nurse or doctor will confirm your deficiency Injection is usually given in the shoulder Slight pinch or sting for 23 seconds Possible brief dizziness or tingling Pre-shot tips: Eat something beforehand Wear loose clothing Stay seated for 10 minutes after What to Expect After Getting a B12 Shot Slight soreness at the injection site Redness or bruising (rare but not harmful) Headache or tiredness in the first 24 hours Most feel normal or better after 12 days Aftercare: Drink water Avoid strenuous activity if dizzy Monitor for swelling or allergy signs Alternatives to B12 Injections: Supplements and Food Sources Not everyone wants or needs a shot

"How Nature builds the pigments of life" (PDF)

If you do experience side effects, they usually subside after a few weeks of your body getting used to the medication

Coenzyme B12 riboswitches are widespread genetic control elements in prokaryotes