Garolla A, et al. - In this trial, the authors evaluated the levels of cholesterol and its oxidized derivatives 7β-hydroxycholesterol and 7-keto-cholesterol to order to identify a causative association between sperm membrane composition in male fertility. The results illustrated a strong variation in the cholesterol and its oxidized derivatives of infertile and fertile subjects. Data hinted towards a strict biochemical link associating the testis function, sperm membrane status and male fertility potential.