Best Vitamin B12 Injection Site: Administering B12 Shots How Long Does It Take For B12 Injections To Work? Anyone think the b12 jabs sting like hell. Ive got one tomorrow and i dread it everytime. The needle going in dosnt hurt. Its when they push the liquid in! Vitamin B12 Injection Side Effects and Safety
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why does b12 injection hurt so much B12 Shots at Home: How, Where & How Often to Inject Yourself