Extension Health
A New York clinic for longevity, performance, and healthspan care.
Contact Information
About
The clinic combines physician-led diagnostics with interventional and regenerative medicine for longevity, performance, metabolic health, hormone support, recovery, and nervous-system care. Patients can access care through consultations, diagnostic and treatment packages, and memberships that include physician oversight and longevity-strategy sessions.
Services
- Diagnostic packages
- Clinical detox
- Women's health
- Advanced imaging
- Regenerative aesthetics
- Regenerative orthopedics
- Peptide therapy
- Regenerative medicine
- Methylene blue IV therapy
- Health consultations
- Vitamin IV therapy
- Platelet-rich plasma therapy
- Neuro Reset
- Hyperbaric oxygen therapy
- EBOO ozone therapy
- Therapeutic plasma exchange
- VO2 max testing
- Resting metabolic rate testing
- Longevity bloodwork and lab work
- DEXA scanning
Team
Checked Date: Oct 16, 2026Dr. Jonathann Kuo
MD, Founder, CEO, and Chief Medical Officer
Double board-certified in anesthesiology and pain management, with training in interventional and regenerative medicine.
Dr. James Salway
MD, MSc, Longevity Physician
Board-certified emergency physician with training in regenerative medicine, clinical operations, quality improvement, and telehealth.
Dr. Kathleen Léger
MD, Nephrologist, Intensivist, and Longevity Specialist
Board-certified in internal medicine, nephrology, and critical care medicine, with a clinical focus on women's health.
Morgana Russino
Longevity Strategist, Registered Dietitian
Dr. Salim El Sabbagh
MD, Psychiatrist
Board-certified psychiatrist specializing in interventional neuropsychiatry and integrative mental health.
Lauren Flandrich
Physician Assistant
Valerie Sheehan
Family Nurse Practitioner
Dr. Nick Copeli
Director of Sports Medicine
Board-certified in emergency medicine, sports medicine, and regenerative medicine, with training in interventional pain medicine.
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