The Premier Platform for Education on Testosterone Deficiency (TD)


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Our Mission

Our mission is to be the premier platform for education on testosterone deficiency – also called hypogonadism- and its treatment, for both health care professionals and the public.

Testosterone Deficiency

Testosterone deficiency is a common condition in adult men that can cause a number of bothersome symptoms and impaired health:


Low Libido

One of the most common symptoms is reduced sexual thoughts and desire, called libido.


Erectile Dysfunction

Testosterone deficiency may cause reduced quality of erections, and absence of nighttime or morning erections



One of the most common symptoms is fatigue that is not easily explained. Some men say they feel “depleted.”


Decreased Muscle Strength & Mass

Testosterone plays a key role in supporting muscle mass and strength. Low testosterone levels can result in reduced muscle mass.


Increased Fat

Low testosterone levels are associated with greater fat mass, especially in the abdomen.


Depressed Mood

Some men with low testosterone levels find themselves sad or emotional without good explanation.

Want to learn more about Testosterone Deficiency?

Abraham Morgentaler, MD, FACS

T4L Education is the brainchild of Abraham Morgentaler, MD, FACS, a pioneer in the study and treatment of testosterone deficiency since the 1970s.

Dr. Morgentaler is the leading global expert in the area of testosterone and prostate cancer.