You may have vitamin B12 deficiency because of pernicious anemia or other reasons, such as taking certain medications, having certain health conditions, or drinking heavily
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B12 injections are administered intramuscularly, typically in the deltoid (upper arm) or gluteal (buttocks) muscles
Q: How often should I get B-12 injections
Testosterone Link: The study found a positive, linear relationship between higher vitamin B12 levels and increased testosterone, suggesting that B12 could help reduce the odds of testosterone deficiency
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