In: Jameson JL, De Groot LJ, de Kretser DM, et al, eds. Endocrinology: Adult and Pediatric. 7th ed. Philadelphia, PA: Elsevier Saunders; 2016: chap 139. Morgentaler A, Zitzmann M, Traish AM, et al. Fundamental concepts regarding testosterone deficiency and treatment: international expert consensus resolutions. Mayo Clin Proc. 2016; 91 (7): 881-896. PMID: 27313122www.ncbi.nlm.nih.gov/pubmed/27313122. US Food and Drug Administration website. FDA drug safety communication: FDA cautions about using testosterone products for low testosterone due to aging; requires labeling change to inform of possible increased risk of heart attack and stroke with use.www.fda.gov/drugs/drugsafety/ucm436259.htm. Updated February 26, 2018. Accessed May 20, 2019. What role does testosterone play in men’s health? Testosterone is the most important sex hormone that men have.