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feel ill after b12 injection Vitamin A Vitamin B12 is a quick shot that gives your body vitamin B12 directly into the muscle. This helps your body absorb it faster than tablets. Vitamin B12 helps Vitamin B12 Injection Side Effects
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This ensures they get the right amount for their needs

Those using B12 for performance or stress recovery may benefit from biweekly boosts How often should I get a B12 injection

Signs include feeling very tired, weak, and having nerve problems

Br Med J 1993;306:1645-8