Fish Oil Supplements Are Associated with Better Testicular Function

Studies in men who are part of infertile couples have shown an association between testicular function and use of fish oil supplementation. Researchers assessed this association in 1679 young Danish men being examined for military service; 98 used fish oil supplements (dosage and type could not be determined). Compared with men who did not use supplements, supplement users were slightly older, less likely to smoke, and more likely to self-report high levels of physical fitness.

In analyses adjusted for demographic and clinical variables, men who used fish oil supplements had larger testes, higher sperm counts, and greater semen volume than those who did not. The ratio of free testosterone to luteinizing hormone was higher in the supplement g…