Both cite the Institute of Medicine which has not established a "Tolerable Upper Intake Level" for vitamin B12, despite having done so for other nutrients as their source
Testosterone therapy is contraindicated in men attempting to overcome infertility 219,220 A possible exception is nasal testosterone gel, which has been found to have little effect on gonadotropin levels or semen parameters, and may be useful to improve sexual function in men with low testosterone levels
doi:10.2903/j.efsa.2008.815
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