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 ...

Total testosterone measures the full amount of the hormone in your blood, while free testosterone represents the small, active portion your body can actually use to support muscle growth, energy, mood ...

There might be a growing buzz around testosterone replacement therapy but that doesn't mean it's just a lifestyle trend.