Testosterone and Cardiovascular Health: What the Research Shows

Educational only — not medical advice.

Several studies have explored the relationship between testosterone levels and cardiovascular function. Although the findings are preliminary and largely mechanistic, they offer insight into how hormone balance may influence vascular health.

Animal Research on Arterial Plaque Formation

An animal study in Circulation (2007;116(21):2427–2434) examined feminized mice—animals with nonfunctional androgen receptors and low circulating testosterone. When given physiologic testosterone injections, the mice showed:

  • Increased production of HDL

  • Reduced formation of fatty streaks along arterial walls

These findings suggest that normal physiologic testosterone levels may influence early plaque development.

Effects of Testosterone on Lipid Profiles in Humans

In men with low testosterone, injections were shown to improve lipid markers. A study in Atherosclerosis (1996;121:35–43) reported:

  • Lower total cholesterol

  • Lower LDL cholesterol

  • No significant impact on HDL levels

However, in healthy men with normal baseline testosterone, injections did lower HDL cholesterol, according to research in the International Journal of Andrology (1995;18:237–242). This underscores that hormonal effects may differ in men who are deficient versus those who are not.

Testosterone and Blood Vessel Function

Research in Hypertension Research (2007;30(11):1029–1034) evaluated testosterone levels and vascular endothelial health in 187 men. Using ultrasound to measure arterial elasticity, the study found that:

  • Lower testosterone levels correlated with poorer vascular elasticity

  • This association held independently of age, cholesterol, weight, blood pressure, and other cardiovascular risk factors

Testosterone and Heart Failure

Testosterone may influence functional capacity in men with chronic heart failure.

  • A year-long double-blind, placebo-controlled study in the European Heart Journal (2006;27(1):57–64) followed 76 men with moderate to severe heart failure.

    • 35% of those using a testosterone patch improved by one NYHA class

    • Improvements were also noted in exercise tolerance and quality of life

  • Another double-blind, placebo-controlled study published in Heart (2004;90:446–447) found that testosterone injections increased walking distance in men with congestive heart failure.

Takeaway

These studies suggest that testosterone—particularly when levels are low—may influence cholesterol metabolism, vascular function, and exercise capacity. However, hormone therapy is complex and carries risks, and these findings should not be interpreted as treatment recommendations. They do reinforce the importance of evaluating hormone status as part of a broader picture of cardiovascular health.