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Intense or excessive physical activity, particularly endurance sports or rigorous training regimens, can affect hormone levels and disrupt menstrual cycles, says Dr Lee

Our team can help tailor a Vitamin B12 injection regimen to meet your health goals

Additionally, if your gastrointestinal tract does not function normally, as with celiac disease or Crohns disease, you may have trouble absorbing or releasing vitamin B12, which will affect the levels in your body and how long the vitamin stays there

The skin of the injection site should be smooth, and if you are injecting intramuscularly then its important that the muscle is relaxed