Men with both low testosterone and heart disease have been linked to higher risk of heart death.

A study in the UK has found low testosterone is a red flag for heart disease in men. However, researchers still have not concluded whether or not low testosterone causes or worsens heart disease or whether testosterone replacement therapy would work to fight heart disease.

Low testosterone levels are now a good indicator of heart disease, but simply raising your testosterone levels will not help combat heart disease. So instead of testosterone replacement therapy to cut down heart disease risk, just use the normal methods to fight heart disease like weight loss, exercise, and a healthy diet.

This link only applies to men, not women. For women, high levels of testosterone are a sign of heart disease. Either way, testosterone levels are only an indicator of heart disease, not the cause.