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Too much of a good thing does not always do what we hope it will

It's also involved in immune cell function and cellular repair

However, as with any medical treatment, potential risks and side effects should be discussed with your healthcare provider

Vitamin B12 shots and supplements are popular among those looking for a quick fix for weight loss

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I also have fibromyalgia so it is really hard to figure what is causing what with me. I really would like to know if B12 at 4000 can be harmful or be a sign of something being wrong