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Certain chemotherapy regimens, some antibiotics if taken for long periods, and long-term use of the epilepsy drug phenytoin, carry a risk of nerve damage
Pregnancy Parenteral methylcobalamin is classified as pregnancy category C
Up to 28-day in-use period with proper aseptic technique
Even if you regularly consume B12-rich foods like meat, fish, and dairy, you might still need supplementation
However, elite sports organizations that follow WADA guidelines may prohibit any substance that enhances NAD or mimics metabolic regulation
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