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For example, a study published in the Journal of Alternative and Complementary Medicine found that B12 supplements improved endurance and reduced fatigue in athletes
There may also be minor irritation at the injection site,for example, redness, tenderness, or a brief burning sensation where the NAD+ solution is injected subcutaneously
In terms of how soon: some effects (like improved alertness) can be within a few days
Endometriosis Endometriosis, a condition where endometrial (uterine lining) tissue grows outside the uterus, often causes irregular periods or longer periods
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