why does b12 injection sting Vitamin Injections Do B12 Injections Hurt? Painful
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PMID: 25953825

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I used to constantly feel like I needed to eat, and now I literally just put down the food and walk away when Im satisfied

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It may take a few weeks before your Vitamin B12 levels and symptoms, such as extreme tiredness or lack of energy, start to improve

However, they should not substitute a balanced diet rich in vitamin B12