A huge number of men taking a testosterone drug in the United States have not even had their testosterone levels measured; the FDA’s approval of testosterone drugs is only for men who make too little of the hormone on their own, leading to a condition known as hypogonadism as well as men with endocrine tumors or those undergoing chemotherapy.

Recent study conclusions regarding testosterone supplements have many men worried whether they may suffer a serious adverse health risk as a result of the testosterone supplement they are currently taking. A study published in the Journal of American Medical Association found 29% increase in heart attack, stroke and death among men taking testosterone supplements when compared with men not taking the drug...