They’ve been all over TV: treatments for "Low-T," sometimes called andropause.

Researchers estimate up to six million men suffer from low testosterone, but only five percent realize it’s a treatable problem.

Those suffering from it generally are on treatment their entire life.

"Testosterone is a very powerful tool. It makes huge differences in a man’s health, his quality of life and how he looks,” says Karron Power, MD, MPH.

A new study from UCLA found men who took testosterone treatment that were under age 65 and had a history of heart disease, had a twofold increased risk of heart attack.

Testosterone treatments can also increase the risk of prostate cancer, as well as feed any possible cancer cells in the body, according to a report in the Journal of American Medical Association.