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Some bodybuilders and athletes use anabolic steroids to build muscles and improve athletic performance

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Nakamura, E., Yoshikai, N

The study showed that the administration of 10.000 ugr of hydroxocobalamin nasal drops twice weekly was associated with a significant increase in vitamin B12 serum levels over the course of 3 months, starting from a median of 328 pmol/l (range 244429) to 973 pmol/l (range 4731,476)

When levels are low, it can lead to persistent fatigue, weakness, and lack of motivation

In other words, these substances are potentially dangerous, possibly experimental, but tempting to athletes seeking an extra edge