London · New York · Zürich
Our Ethos.
Our Standard.
The Catalyst Clinic is built on a simple principle: long-term health comes first. Not quick fixes. Not surface-level results. Deep, measurable, sustainable change — biology that works better, and a life that feels better. Everything we do is tailored to your data, your goals, and your lived experience.
What We Stand For
Diagnostics Before Everything
No protocol is discussed without your bloodwork. This is non-negotiable, applied to every patient without exception.
No Templates. No Delegation.
Dr. Ethan personally reviews your results, designs your protocol, and oversees every review. No algorithms. No junior staff.
Pharmaceutical Grade — Always
GMP-certified, EMA-regulated, FDA-registered pharmacies exclusively. Certificate of analysis on every order.
Ongoing Clinical Oversight
Monthly reviews and repeat bloodwork every four to five months. Oversight that continues for as long as you are with us.
Complete Transparency
Every decision is documented, explained, and traceable. A patient who understands their programme is a safer patient.
Our Philosophy
Age-Less Living Is Not
A Slogan. It Is A Standard.
Our longevity and wellness model integrates evidence-based regenerative medicine with personalised lifestyle strategies. This includes advanced peptide advisory programmes, hormonal optimisation, metabolic and nutritional guidance, structured fitness planning, stress and emotional regulation, and supportive coaching. Each element works together to improve how your body functions from the inside out.
Everything we do is tailored. Your programme evolves with your biomarkers, your goals, and your lived experience. The aim is to help you stay stronger, sharper, more resilient, and more aligned with the way you want to live — not just for a month, but for life.
At The Catalyst Clinic, we believe that the most important clinical decision made at any longevity clinic is the decision to get the data before designing the protocol. No data means no clinical basis. No clinical basis means no responsible programme.
What We Integrate
- Advanced peptide advisory programmes
- Hormonal optimisation research
- Metabolic health & nutritional guidance
- Structured fitness planning
- Stress & emotional regulation
- Cognitive function research
- Sleep quality optimisation
- Bespoke supplementation via AURION™️
- Supportive lifestyle coaching
All advisory discussions take place within a regulated private medical consultation, following mandatory blood diagnostics reviewed personally by Dr. Ethan Hausman-Marquis.
Our Treatment Model
A Three-Tier
Clinical Framework
The Catalyst Clinic operates across three integrated tiers — from foundational aesthetic medicine through to comprehensive functional health and longevity science. Every tier is built on the same diagnostic-first, physician-led framework.
Tier 01
Outer Health
Aesthetic Medicine & Looking Good
Evidence-based aesthetic treatments that restore and enhance outer appearance — the foundation of the patient journey.
- Dermal fillers & injectables
- Advanced skincare protocols
- Healing therapies
- Skin regeneration research
- Aesthetic medicine consultations
Tier 02
Inner Balance
Maintenance, Wellbeing & Feeling Good
Sustaining and deepening aesthetic results through internal balance — blood chemistry, hormonal health, and metabolic function.
- Blood chemistry monitoring
- Hormone balance advisory
- Metabolic health consultations
- Nutritional guidance
- Bespoke supplementation (AURION™️)
Tier 03
Deep Longevity
Comprehensive Functional Health & Feeling Young
The most advanced tier — comprehensive regenerative and longevity medicine programmes grounded in molecular biology and diagnostics.
- Peptide advisory programmes
- Longevity medicine consultations
- Mental health & stress regulation
- Sexual health research
- Life coaching integration
The Six Pillars
How We Look
At The Whole Person
Every Catalyst Clinic programme is built across six integrated areas of health. No single pillar is optimised in isolation — they work together.
Pillar 01
Fitness & Diet
Structured fitness planning and evidence-based nutritional guidance tailored to your biomarkers and longevity goals. Movement and nutrition as medicine — not afterthoughts.
Pillar 02
Chemical Balancing
Hormonal optimisation, metabolic health, and peptide advisory programmes — all guided by mandatory comprehensive bloodwork reviewed by Dr. Ethan personally.
Pillar 03
Cosmetic Aesthetics
Evidence-based aesthetic medicine — from dermal injectables to advanced skin regeneration protocols. Outer results sustained from the inside out.
Pillar 04
Mental Health
Stress regulation, emotional resilience, cognitive function research, and supportive coaching integrated into every programme — because mental performance is inseparable from physical health.
Pillar 05
Sexual Health
Hormonal and regenerative approaches to sexual health — discussed openly, clinically, and without judgement within a private physician consultation.
Pillar 06
Reconstructive Aesthetics
Advanced regenerative and reconstructive aesthetic approaches — integrating the latest research in tissue repair, collagen synthesis, and cellular regeneration.
The Physician
Dr. Ethan
Hausman-Marquis
Dr. Ethan Hausman-Marquis
Founder & Lead Physician
- PhD, Cell & Genomic Biology — Karolinska Institute, Stockholm
- Research — L'École Normale Supérieure, Paris
- US Board-Certified, Regenerative Medicine
- European Board-Certified, Longevity Medicine
- Member, A4M — American Academy of Anti-Aging Medicine
- Author — Peptide-Based Cancer Therapies
- Author — Exploring the World of Peptides
- Host — The Science of Ageless Living Podcast
- Nearly 20 years specialist research experience
"The most important decision a longevity clinic makes is not which compound to recommend — it is whether to get the data before making any recommendation at all. Diagnostics are not optional. They are the standard of care."
Dr. Ethan's path has been guided by one goal: helping people live longer, healthier, and more vibrant lives. From foundational molecular biology at UCLA, to advanced genomics research at L'École Normale Supérieure in Paris, to doctoral work at the Karolinska Institute in Stockholm — his scientific training underpins every clinical decision made at The Catalyst Clinic.
He is the author of two published works in peptide science and host of The Science of Ageless Living — the leading peptide and longevity podcast. No other peptide clinic physician in London has published specifically in this field.
Our Locations
Three Cities.
One Standard.
The same diagnostics-first, physician-led clinical standard applied across every location — in person or remote, anywhere in the world.
Begin Your Programme
Every programme
begins with
your data.
Ready to experience a genuinely diagnostics-first, physician-led approach to longevity and wellness? Begin with a discovery consultation — in person in London, New York, or Zürich, or remotely anywhere in the world.
Every Programme Includes
- Mandatory pre-consultation bloodwork
- Personal review by Dr. Ethan
- Pharmaceutical-grade compounds where applicable
- Bespoke protocol — no templates
- Injectable pen delivery where applicable
- Monthly physician reviews
- Repeat bloodwork every 4–5 months
- Full clinical documentation
London · 96 Kensington High Street, W8 4SG
New York · 154 Grand St, 5th Floor, NY 10013
Zürich · Bahnhofstrasse 10, 8001
Remote consultations available worldwide
hello@thecatalystclinic.com
The Catalyst Clinic provides wellness and lifestyle advisory services. Compounds referenced on this site are not licensed medicines under the Human Medicines Regulations 2012 and are not approved by the MHRA for human use in a therapeutic, aesthetic, or wellness context. Nothing on this page constitutes a treatment recommendation, prescribing guide, or medical advice. For our full compliance statement please visit thecatalystclinic.com/compliance-uk.