In this 3-month randomized controlled study, the participants received 2 capsules of a micronutrient supplement or a placebo twice daily.

Each capsule of the supplement (Fertilis homme^®) contained L-carnitine (220 milligrams or mg), L-arginine (125 mg), vitamin E (60 mg), L-glutathione (40 mg), zinc (20 mg), coenzyme Q10 (7.5 mg), folic acid (0.4 mg), and selenium (0.03 mg).

The following tests were performed before and after the study: semen analysis, DNA fragmentation assay, and a pregnancy check using a test for human chorionic gonadotropin (hCG) and/or a pelvic ultrasound. Furthermore, assisted reproductive technologies were initiated and followed by an embryonic quality assessment. Between 8 and 24 months after the end of the study, the participants were asked about achieving a live birth.

An antioxidant supplement for sperm health and fertility outcomes among men with infertility Original paper