Like the stock market and foreign car engines, erections are mysterious things that seem to have a mind of their own. When they don't happen, it can be disappointing, at the very least.
Decreased blood flow, typically because vessels that supply blood to the penis have narrowed, is often the cause of erectile dysfunction (ED) in older men. Emotional issues are more commonly at the root of it for younger men.
Regardless of the reasons, it's important to look for answers.
If your testosterone level measures in the normal range, raising it through testosterone replacement therapy (TRT) probably won't help your ED. Instead, you'll have to look for and address other causes.
For men who do have low testosterone levels, TRT has a better track record of restoring a man's sex drive than overcoming ED.
While many men on TRT do report improvements in their erections, they often need added help from ED drugs known as PDE-5 inhibitors, such as: