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Dr. Thomas O'Connor, MD

Concierge Internal Medicine physician, Essex, CT

Testosteronology Health Portal
5.0 (10 reviews)

Dr. Thomas O'Connor founded Testosteronology, an internal medicine sub-specialty focused on men on testosterone and anabolic steroids.

28 Main Street, Suite 5, Essex, CT 06426
At a glance
Practice model
Online health portal membership
Health Portal membership
$24.99 per month

Facts on this page last checked October 2026. How we check doctors

About Dr. O'Connor

Dr. O'Connor is the founder and CEO of Testosteronology and holds the title Physician-In-Chief. He created it as a sub-specialty of internal medicine. Before that, he spent many years caring for thousands of men who took testosterone or anabolic steroids.

He provides testosterone replacement therapy and treats anabolic steroid induced hypogonadism. He also cares for cardio-metabolic concerns such as hypertension, diabetes, hypercholesterolemia, cardiovascular disease, erectile dysfunction and sexual dysfunction. He runs the Anabolic Doc YouTube channel, which teaches about anabolic steroids.

Outside medicine, he competed in powerlifting and bench pressed 505 pounds in the 198 pound weight class at the American Powerlifting Association in 2012.

Membership and fees

The Testosteronology Health Portal membership is $24.99 a month.

It is an educational health portal with a health tracker for men on testosterone therapy.

$24.99 per month

Services

Testosterone replacement therapy Anabolic steroid induced hypogonadism Hypertension Diabetes Hypercholesterolemia Cardiovascular disease Erectile dysfunction Sexual dysfunction
What internal medicine doctors commonly treat

Hospital and practice affiliations

Founder and CEO of Testosteronology
Physician-In-Chief of Testosteronology

Location

28 Main Street, Suite 5, Essex, CT 06426
Testosteronology Health Portal practice page
Directions

Recognition and research

Publications

Co-authored a peer-reviewed survey of 2,385 men using anabolic androgenic steroids, published in the American Journal of Men's Health in 2020.
Wrote the 2017 book America on Steroids: A Time to Heal.
Contributed as an author to Bill Llewellyn's Anabolics, 11th Edition.

Media and books

Featured medical expert on anabolic steroids and performance-enhancing drugs in outlets including Muscle and Fitness, the New York Times, GQ Magazine and Dr Phil.

Patient reviews

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Rated 5 out of 5

"Ensures I feel confident and informed about my treatment plan."

FMDD UserJun 2024
Rated 5 out of 5

His dedication and expertise are impressive

"I saw Dr. O'Connor for the first time last week. He worked with me for 90 minutes and solved all of my concerns. He was the third doctor I had seen in the previous year, and each one had either disregarded me or did not fully comprehend what was happening. Dr. O'Connor is fantastic!!"

FMDD UserMar 2022
Rated 5 out of 5

He exceeded my expectations

"I don't usually write reviews, but he and everyone in his practice exceeded my expectations, so I felt obligated to share my experience."

FMDD UserJan 2022
Rated 5 out of 5

He is in a class by himself

"Dr. O'Connor is in a class by himself. He is one of the most compassionate and knowledgeable doctors I've ever encountered."

FMDD UserJan 2022

Questions patients ask

Does Dr. O'Connor offer a membership?

Testosteronology runs an online membership with educational content and tools. The Testosteronology Health Portal membership includes a health tracker for men on testosterone therapy.

How much does the Testosteronology Health Portal membership cost?

The Testosteronology Health Portal membership is $24.99 a month.

What conditions does Dr. O'Connor treat?

Dr. O'Connor provides testosterone replacement therapy and treats anabolic steroid induced hypogonadism. He also cares for cardio-metabolic concerns such as hypertension, diabetes and cardiovascular disease.

Where is Dr. O'Connor's office?

The practice has offices in Essex, Connecticut and Fort Lauderdale, Florida.

Does Dr. O'Connor offer telehealth?

Testosteronology offers medications through a telehealth partner after an online medical intake.

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