4th Street Medical is the first dual board-certified, physician-led precision medicine practice in Miami Beach, where the art of medicine meets the science of health optimization.
We anchor our work in preventing the four leading causes of chronic disease and mortality: cardiovascular, neurodegenerative, metabolic, and neoplastic. Within this framework, we place a particular focus on the science of aging, leveraging data-driven therapeutics to slow biological age, enhance cognition, optimize performance, and refine body composition with clinical precision.
We believe the future of medicine lies in prevention, not repair. Our mission is to shift care from reactive “sick care” to proactive health optimization by identifying risks early, intervening with precision, and extending both lifespan and healthspan. Personalized prevention, guided by cutting-edge science, is the foundation for changing health outcomes at every level.
Aging, in our view, is not decline, it is a process to be understood, measured, and reshaped. Through cellular and hormone optimization, advanced therapeutics, and integrated lifestyle strategies, we help our patients sustain resilience, clarity, and balance across the years.
Every journey at 4th Street Medical is bespoke. From your first assessment to your precision health pathway, our team of physicians and specialists curate an experience that is as innovative as it is transformative.
We believe the future of medicine lies in prevention, not repair. Our mission is to shift care from reactive “sick care” to proactive health optimization by identifying risks early, intervening with precision, and extending both lifespan and healthspan. Personalized prevention, guided by cutting-edge science, is the foundation for changing health outcomes at every level.
Aging, in our view, is not decline, it is a process to be understood, measured, and reshaped. Through cellular and hormone optimization, advanced therapeutics, and integrated lifestyle strategies, we help our patients sustain resilience, clarity, and balance across the years.
Every journey at 4th Street Medical is bespoke. From your first assessment to your precision health pathway, our team of physicians and specialists curate an experience that is as innovative as it is transformative.
Dr. Jay Feldman is a board-certified emergency medicine physician and founder of 4th Street Medical, a Miami clinic focused on longevity, cellular optimization, and integrative medicine. With over 20 years in high-acuity emergency departments, he combines clinical expertise with root-cause, proactive care to help patients achieve peak performance.
He specializes in precision diagnostics, peptide therapeutics, and metabolic optimization, using advanced tools like full-body MRI, coronary CTA, AI-driven plaque analysis (Cleerly), and cancer screening panels to personalize care and extend healthspan.
Dr. Jessica Cook, MD, FACEP, is a board-certified emergency medicine physician with advanced fellowship training in Integrative Medicine and Healthcare Simulation. Originally from East Coast Canada, she earned her Bachelor of Science at McGill University and her medical degree on full scholarship at Trinity College Dublin.
She completed her Emergency Medicine residency at Mount Sinai St. Luke’s-Roosevelt in New York City, followed by fellowships at Yale University’s Center for Medical Simulation and the Andrew Weil Center for Integrative Medicine.
We deserve a system that helps us stay well, not just get treated when we’re sick. My mother was the founder of 4th Street Bodyworks — a passionate entrepreneur and community leader who inspired others through movement, vitality, and nutrition. When she was diagnosed with Alzheimer’s at 58, it came out of nowhere. Over the next 14 years, I watched her slowly decline. Only later did we learn she carried the APOE
4/4 gene and that her two sisters, also gene carriers, would face the same diagnosis. But one sister, whomade major lifestyle changes, has maintained her cognitive health well into her 70s.
We deserve a system that helps us stay well, not just get treated when we’re sick. My mother was the founder of 4th Street Bodyworks — a passionate entrepreneur and community leader who inspired others
physician-led, evidence-based precision health
A 60–90 minute physician-led consultation reviewing personal and family history, current health concerns, goals, and lifestyle factors to establish a comprehensive roadmap for optimal health.
We go beyond standard labs. Every patient begins with an in-depth assessment across blood, genomics, imaging, and advanced biometrics. Our goal is to identify risks early and create a baseline that captures true biological age, performance markers, and resilience metrics.
No cookie-cutter plans. Our physicians build individualized treatment roadmaps that integrate peptides, hormones, cellular therapies, nutrition, and lifestyle interventions. Each protocol is tailored to the patient’s goals—longevity, cognition, performance, or aesthetics.
Health is dynamic. We leverage wearables, digital tracking, and serial biomarker testing to monitor progress in real time. Every data point feeds back into the system, ensuring therapies are continually optimized for maximum impact.
Medicine is never one-and-done. Patients meet regularly with their physician team to refine strategy, recalibrate interventions, and layer in next-generation diagnostics as the science evolves. The objective: extend lifespan and healthspan, while keeping patients performing at their peak.
