The Premier Platform for Education on Testosterone Deficiency (TD)
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.
Latest Video
How Lizard Sex Transformed Medicine (19-min)
Dr. Morgentaler
Current News
Dr. Morgentaler Receives Lifetime Achievement Award
Dr. Morgentaler recently received the SMSNA Ronald W. Lewis Lifetime Achievement Award.
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Testosterone Therapy and Men’s Health Congress 2026
Masterclass – Sarasota, Florida
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
Fatigue
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.
