is it safe to injection b12 in a persons back Injecting What happens when you inject vitamin B12? Will my B12 Injection Work
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Does the MTHFR gene cause iron deficiency

What we DO know, however, is that only 20% (or even less) of the people with symptomatic B12 deficiency have anaemia or altered size of the red blood cells
The patient continues to improve and feel well

On the other hand, a person with more muscle mass may require a slightly longer needle for an intramuscular shot to reach the muscle effectively

There are certain medical conditions where caution is needed
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