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Testosterone Directory
Testosterone is a hormone that acts as the primary sex hormone in men. It is produced by the male testicles and the female ovaries. Testosterone levels in men increase during and after puberty, dropping again after about age 40. Testosterone causes the deeper voice, bigger muscles, body hair, and other primarily male features. Follow the links below to find WebMD's comprehensive coverage about what testosterone is, what it does in the body, what levels are normal, and much more.
Medical Reference
Finding an Erectile Dysfunction Solution
WebMD explains the various tests to find the cause of erectile dysfunction.
Seeing a Doctor: Help for Erectile Dysfunction
Erectile dysfunction is a delicate topic. WebMD explains how a doctor typically approaches the subject to make a diagnosis
Erectile Dysfunction Treatment
The various treatments for erectile dysfunction (ED), including drugs, herbs, devices, and surgery.
The Male Reproductive System
An overview of the male reproductive system from the experts at WebMD.
Features
Boosting Sexual Vitality in Midlife
Follow these 5 steps to improve your sexual vitality and performance as you get older.
How to Balance Low T
Do you have low T? If so, what can you do about it?
Steroid Doping: Questions and Answers
In the controversy over whether Tour de France winner Floyd Landis used steroids, fans watching from the sidelines have been left a bit confused by all the talk of testosterone ratios and what might affect them. WebMD went in search of some of the answers.
Low testosterone? There’s a fix for that … maybe.
Testosterone therapy is all the rage, but it’s important to know when you really need it.
Video
Slideshows & Images
A Visual Guide to Low Testosterone
A dip in a man's sex drive can be a symptom of low testosterone -- or a normal part of aging. See the symptoms and treatments for 'Low T' in this slideshow .
Slideshow: Effects of Low Testosterone
Natural Ways to Boost Testosterone
Find out what you can do to raise your testosterone levels naturally, including changes to your diet and lifestyle.
Quizzes
The Truth About Men’s Health
Think you know the difference between myth and reality when it comes to men’s health issues? Take this quiz and find out.
Things Men Can Stop Worrying About in Bed
Are you concerned about bedroom “problems” when you don’t really need to be? Take this WebMD quiz to throw back the covers and expose the truth.
The Truth About Testosterone
Take this quiz and see how much you know about aging and low testosterone in men. What do you know about low T and how it can affect you as you get older?