According to the authors of a publication in the April issue of Urology, carnitine is more effective than testosterone in treating symptoms associated with male ageing, such as lowered mood, sexual dysfunction and fatigue. In addition, side effects associated with testosterone use, such as prostate enlargement, can be avoided through the use of carnitine.

a 6-month randomised study, using testosterone (160 mg/db), propionyl-L-carnitine + acetyl-L-carnitine (2 g/db + 2 g/db) and placebo, conducted on 120 patients (mean age 66 years).