Total testosterone measures the full amount of the hormone in your blood, while free testosterone represents the small, ...

This article was reviewed by Felix Gussone, MD. Key Takeaways: Cholesterol is a key building block for testosterone. Through ...

Sometimes, the body doesn’t produce enough testosterone, a condition known as hypogonadism. You're considered to have a testosterone deficiency or low testosterone (also known as low-T) when your ...

This article was reviewed by Felix Gussone, MD. If you’ve been feeling a bit more couch potato than go-getter lately, dragging through the day, snapping at people for no reason, or wondering where ...

With the prevalent use of opioids in the treatment of acute and chronic pain, the effect on the hypothalamus is often overlooked. Fatigue, low libido and decline in mental function are frequently ...

We include products we think are useful for our readers. If you buy through links on this page, we may earn a small commission. Here’s our process. An at-home testosterone test can help people monitor ...

Advertisements for treatments for “low T,” or low testosterone levels in middle-aged and older men, have led to spikes in demand. But the safety and legitimacy of those testosterone therapies hasn’t ...

DEAR MAYO CLINIC: I'm a 56-year-old man without any health problems. Recently, I've noticed I don't have the energy for physical activities that I used to. Working in the yard, riding my bike and even ...

Testosterone therapy is on the rise as men seek more energy and vitality, revealing shifting views on aging and modern ...

Sun, 11 January 2026 at 1:56 pm UTC If you’ve ever had your testosterone levels checked, you may have come across two different numbers: one for free testosterone and the other for total testosterone.