Testosterone plays an important role in physical and mental health. Low levels of testosterone can have various effects, such as weakened bones, higher fat percentage, and reduced muscle strength. It can also cause emotional disturbances, like depression and irritability.

Morgentaler, A., Traish, A., Hackett, G., Jones, T. H., & Ramasamy, R. (2019). Diagnosis and Treatment of Testosterone Deficiency: Updated Recommendations From the Lisbon 2018 International Consultation for Sexual Medicine. Sexual medicine reviews, 7(4), 636–649. https://doi.org/10.1016/j.sxmr.2019.06.003