dangers of b12 injections Vitamin Side Effects What are the Side Effects
Description
Injectable: Subtle improvements may appear at weeks 2-3

Rare but serious: severe allergic reaction with trouble breathing, chest tightness, or swelling of face and throatseek emergency help right away

This allows for nearly 100% absorption

[6] There are 4 common injection sites for administering B12, but you'll want to discuss what's best for you with your doctor
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Jorge Moreno, a Yale Medicine internist and assistant professor of medicine
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Both appear in research and practitioner protocols
