Opening early 2027

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Treatments · Long Island, NY

Testosterone Replacement Therapy
Confirm the diagnosis, then treat with care and monitoring.

At a glance

Testosterone replacement therapy (TRT) treats low testosterone (male hypogonadism) when symptoms are present and blood tests confirm low levels. Care starts with the right diagnosis: two early-morning tests, a look for the cause, and a conversation about goals such as energy, libido, strength and fertility. Treatment uses FDA-approved testosterone with regular lab monitoring. Dr. Benjamin (Ben) Klyachman, D.O., board-certified in pain medicine and physical medicine and rehabilitation, leads care at Institute of Function in Nassau County, NY, which welcomes patients from across Long Island, New York City and beyond.

Institute of Function opens in Nassau County, NY in early 2027. Prescribing is physician-supervised after assessment and labs and is never guaranteed. Virtual care is available only in New York when appropriate.

Medically reviewed by Dr. Ben Klyachman, D.O. · Updated October 23, 2026

Signs of low testosterone

Low libido, erectile changes, fatigue, low mood, loss of muscle and strength, more body fat and lower bone density. Symptoms overlap with sleep problems, stress, medications and other conditions, so testing matters.

How it is diagnosed

Two separate early-morning total testosterone tests, plus free testosterone, LH, FSH and other labs when needed to find the cause. We also review sleep (including sleep apnea), weight, medications and fertility plans.

How we approach it

  • Lifestyle and sleep first where they are driving low levels.
  • FDA-approved testosterone when it is indicated: injections (testosterone cypionate or enanthate), gels, oral capsules or pellets. FDA-approved patches have been discontinued in the US.
  • Monitoring of testosterone levels, hematocrit, PSA when appropriate, blood pressure and symptoms.
  • Testosterone lowers sperm production. If you want children now or later, we discuss fertility-sparing options first; clomiphene is used off-label for this purpose, while hCG use depends on the product, diagnosis and approved indication.

Safety and current FDA status

In 2025 the FDA updated testosterone labeling after the TRAVERSE trial found no increase in major heart events compared with placebo. Labels still include a blood pressure warning. In June 2026 the FDA asked manufacturers for further class-wide label updates, including on age-related low testosterone and prostate cancer language; those updates are in progress. Testosterone is a controlled substance (Schedule III) and is prescribed only after an in-person or approved assessment.

Common
questions.

This page is general information, not medical advice. Individual results vary. Medical Disclaimer

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