London · New York · Zürich
Physician-Led
Longevity
Consultations
Diagnostics-First.
The Catalyst Clinic is the UK's leading physician-led advisory clinic in longevity and peptide research — the only clinic in London, New York, and Zürich where every consultation is personally overseen by a physician with a PhD in Cell and Genomic Biology, nearly 20 years of specialist peptide research experience, and three published works specifically in this field. Every consultation begins with mandatory comprehensive bloodwork. No advisory programme is discussed without your data.
Consultation Overview
Initial Consultation
60 minsIn-person or remote
Diagnostics Required
YesMandatory before every advisory consultation
Monthly Reviews
IncludedPersonal physician oversight throughout
Repeat Diagnostics
Every 4–5 monthsProgramme evolves with your data
Source Standards
GMP-CertifiedEMA-regulated · FDA-registered
Physician Credentials
PhD-LevelThe only published peptide physician in London
Programme Price
From £600/monthInitial consultation from £150 · Remote available worldwide
All compounds sourced exclusively from GMP-certified, EMA-regulated and FDA-registered compounding pharmacies. Certificate of analysis on every order. Not licensed medicines under the Human Medicines Regulations 2012.
Advisory Programmes Tailored To Your Biology
Choose Your Programme
The Catalyst Method is built entirely around your biomarker data and current scientific literature. The following areas represent the primary themes of peptide compound research that Dr. Ethan consults on. Every programme is bespoke — no two patients receive the same advisory protocol, because no two patients have the same biology.
Performance & Recovery
An area of active scientific investigation exploring how certain peptide compounds may interact with musculoskeletal and recovery-related biological pathways. Research in this area examines compounds including BPC-157 and TB-500 for their potential roles in tissue biology and recovery-related cellular processes.
- Tissue repair biology research
- Musculoskeletal pathway investigation
- Inflammatory modulation research
- Recovery-related biological pathways
Cognitive & Mood
An emerging field of research examining how certain neuropeptide compounds may interact with neurological and mood-related biological systems. Research in this area examines compounds including Semax and Selank for their potential interactions with neurotrophic and neurological signalling pathways.
- Neuropeptide research
- Neurological signalling investigation
- Neuroplasticity research
- Mood-related biological systems
Longevity & Metabolic
A growing area of scientific enquiry into how certain peptide compounds may interact with metabolic and longevity-related biological pathways. Research examines compounds including Epithalon, MOTS-c, and NAD+ for their potential interactions with metabolic, mitochondrial, and biological ageing pathways.
- Biological ageing research
- Metabolic pathway investigation
- Mitochondrial biology research
- Longevity-related pathway research
Peptides Explained
Peptides in Two Minutes
An animated introduction to how these small protein molecules are being studied for their roles in cell biology, signalling, and regenerative research.
Follow BPC-157, Semax, and GHK-Cu through their proposed biological interactions — created by Dr. Ethan Hausman-Marquis, PhD in Cell and Genomic Biology, Karolinska Institute, Stockholm.
The Podcast
The Science of Ageless Living
The UK's Leading Peptide Research Podcast
Hosted by Dr. Ethan Hausman-Marquis — PhD, Cell and Genomic Biology, Karolinska Institute — and one of the world's leading peptide researchers. The Science of Ageless Living is the UK's leading podcast dedicated to peptide research, longevity science, and biological optimisation — designed to give listeners the scientific context they need to make genuinely informed decisions about their health.
Every episode is grounded in peer-reviewed research. No commercial agenda. No supplements to sell. Just the science — explained by the only physician in London who has spent nearly 20 years researching it and published three books in the field. If you are considering a consultation at The Catalyst Clinic, we actively encourage you to listen first. An informed patient is always a better-served patient.
Published Works
Dr. Ethan's Books
The only peptide clinic physician in London with three published works specifically in peptide science. Available on Amazon in paperback, hardcover, Kindle, and audiobook formats.
New Release · 100 Peptide Profiles · Molecular Reference
The Peptide Encyclopedia: A Molecular Guide to Longevity and Regeneration
Dr. Ethan D. Hausman-Marquis
The definitive mechanistic reference to the 100 most important peptides. Most books tell you what a peptide does — this one tells you why, at the level of receptors, signalling cascades, and gene expression. From GLP-1 agonists and semaglutide to BPC-157, MOTS-c, and emerging longevity compounds — all 100 profiled on the same rigorous template: mechanism, evidence-tier rating (in vitro → animal → human → large trials), molecular data, cautions, and primary references.
Peptides Covered
100 Full profiles
Format
Kindle Paperback · Hardcover
Evidence Tiers
4-Level In vitro → Large trials
Audience
Clinicians & serious readers
Longevity Science · Peptide Research
Exploring the World of Peptides: From Basics to Breakthroughs
The definitive guide to peptide science — written by the only physician in London to have published specifically in this field. From foundational molecular biology to the latest developments in longevity research, this book gives readers the scientific literacy to understand what peptide compounds are, how they are being studied, and what the current research suggests. Essential reading for anyone considering a consultation at The Catalyst Clinic or seeking to understand this rapidly evolving field. Written for both clinicians and the scientifically curious patient.
Oncology · Precision Medicine · Peptide Science
Peptide-Based Cancer Therapies: A New Frontier in Precision Medicine
A rigorous academic exploration of peptide compound research in oncology and precision medicine — grounded in Dr. Ethan's doctoral research at the Karolinska Institute, Stockholm. This work examines how peptide compounds are being investigated as research tools in cancer biology, offering clinicians and scientifically literate readers a detailed overview of the current scientific landscape. No other peptide clinic physician in London has produced academic work of this depth in this field.
The Catalyst Clinic is the only advisory clinic in London, New York, and Zürich where every consultation is led by a physician who has not only spent nearly 20 years researching peptide science, but has published three works in the field and hosts the UK's leading peptide research podcast. We believe informed patients make better decisions — and everything we publish is designed to support that.
Your Journey
Your 6-Step Catalyst Method
Our approach is built on one principle: responsible advisory consultations involving peptide compounds require diagnostics before everything, a physician who reads your results personally, and clinical oversight that continues for as long as you are with us.
Step 01
Blood & Diagnostic Testing
Every programme begins with a full blood panel. No advisory consultation is conducted without your data. This is the foundation of everything that follows — without it, no responsible advisory programme can be designed.
- Complete Blood Count (CBC)
- Comprehensive Metabolic Panel
- Full hormone panel including sex hormones
- Inflammatory markers
- Additional biomarkers relevant to your goals
Step 02
Biomarker-Guided Selection
Dr. Ethan reviews your results personally — not via algorithm, not via delegation. He identifies which areas of peptide compound research are relevant to your specific biomarker profile, health history, and goals.
- Goal-specific compound research matching
- Health profile analysis
- Biomarker-guided selection
- Safety and contraindication screening
Step 03
Bespoke Advisory Protocol
A fully personalised advisory programme designed around your data. No two protocols at The Catalyst Clinic are identical. Every recommendation is documented, explained, and traceable.
- Personalised compound research selection
- Dosage rationale and guidance
- Delivery method guidance
- Complete transparency throughout
Step 04
Induction & Ongoing Reviews
A structured induction session ensures you understand every element of your advisory programme. Monthly physician reviews are included as standard. Bloodwork is repeated every four to five months.
- Detailed induction session
- Monthly progress reviews
- Programme adjustments based on data
- Repeat bloodwork every 4–5 months
Step 05
Strategic Cycling
Advisory programmes at The Catalyst Clinic are designed with cyclicity — preventing biological adaptation, maintaining natural hormonal homeostasis, and optimising long-term outcomes.
- Prevents biological adaptation
- Maintains natural homeostasis
- Avoids endocrine complications
- Optimises long-term programme design
Step 06
Full Transparency
Every decision is documented, explained, and traceable. You will receive full written documentation of your advisory programme and the scientific rationale behind every recommendation.
- Full medical history discussion
- Medication interaction screening
- Open communication channels throughout
- Educational approach at every stage
The Science
Understanding Peptides Before Making Any Decision.
Peptides are short chains of amino acids — the same fundamental building blocks that make up every protein in the human body. They occur naturally and function as biological messengers, interacting with cells, tissues, and biological systems. Insulin and GLP-1 — the active compound in Ozempic and Wegovy — are peptides, which gives some indication of how central these molecules are to human physiology.
Scientific research is actively exploring how synthetic peptide compounds may interact with a wide range of biological pathways — from cellular signalling and tissue biology to metabolic function, neurological systems, and longevity-related processes. This is a rapidly evolving field. The science is complex. The research landscape is moving quickly.
For a comprehensive guide to the science — written by the only physician in London to have published specifically in this field — read Dr. Ethan's book Exploring the World of Peptides, or listen to The Science of Ageless Living podcast, available on Spotify and Apple Podcasts.
Compounds We Consult On
- BPC-157 — tissue repair biology research
- TB-500 — musculoskeletal pathway research
- GHK-Cu — collagen & cellular repair research
- CJC-1295 & Ipamorelin — GH secretagogue research
- Epithalon — longevity and telomere research
- Semax — neuropeptide research
- NAD+ — metabolic and mitochondrial research
- MOTS-c — mitochondrial peptide research
- KPV — anti-inflammatory and gut biology research
- Sermorelin — GH axis research
- Humanin — neuroprotection and longevity research
- Selank — neurological and anxiolytic research
- Klotho — longevity and anti-ageing research
- Pentadeca Arginate — tissue repair and recovery research
Why The Catalyst Clinic
The World's Most Clinically Rigorous Peptide Advisory Clinic.
The only advisory clinic in London, New York, and Zürich led by a physician with a PhD in Cell and Genomic Biology, nearly 20 years of specialist peptide research experience, and three published works in peptide science. Every programme is built on mandatory diagnostics, PhD-level personal oversight, and GMP-certified sourcing — a standard not universally applied across London clinics.
01
Mandatory Diagnostics
Comprehensive bloodwork before any advisory consultation. Non-negotiable, applied to every patient without exception. A standard not universally applied across London clinics.
02
PhD-Level Personal Oversight
Dr. Ethan reviews every result himself. PhD in Cell & Genomic Biology, Karolinska Institute, Stockholm. No delegation. No algorithms. No other London clinic has this.
03
Pharmaceutical-Grade Sourcing
GMP-certified, EMA-regulated, FDA-registered pharmacies only. Certificate of analysis on every order without exception. Verifiable, traceable, non-negotiable.
04
Only Published Peptide Physician
Author of three published works in peptide science. No other peptide clinic physician in London has published specifically in this field. A verifiable fact.
05
Injectable Pen Technology
First clinic in London to provide compounds via injectable pen — accurate, consistent dosing without the complexity of traditional syringe-based approaches.
06
Podcast & Published Works
Host of The Science of Ageless Living — the UK's leading peptide research podcast. Author of three books in peptide science — including The Peptide Encyclopedia. Ongoing thought leadership that no other London clinic can match.
The Physician
Dr. Ethan Hausman-Marquis
Dr. Ethan Hausman-Marquis
Founder & Lead Physician
- PhD, Cell & Genomic Biology — Karolinska Institute, Stockholm
- US & European-Registered Physician
- US Board-Certified, Regenerative Medicine
- European Board-Certified, Longevity Medicine
- Member, A4M
- Author — The Peptide Encyclopedia
- Author — Peptide-Based Cancer Therapies
- Author — Exploring the World of Peptides
- Host — The Science of Ageless Living Podcast
- Nearly 20 years specialist peptide research experience
"The most rigorous advisory standard available in London. Mandatory comprehensive diagnostics before any consultation begins. No other physician in the UK combines this depth of molecular biology expertise with hands-on personal oversight of a private longevity advisory programme."
Dr. Ethan personally reviews your bloodwork, personally designs your advisory programme, personally conducts your induction, and personally oversees your monthly reviews. No templates. No delegation. No algorithms. Every decision is documented, explained, and traceable.
Author of three published works in peptide science and host of The Science of Ageless Living — the UK's leading peptide research podcast. No other peptide clinic physician in London has published specifically in this field.
Bespoke Supplementation
Designed Around Your Biology.
Your supplementation programme is created as an integrated extension of your advisory consultation — not an afterthought, not a generic stack, and not a template. Once your advisory protocol is defined, Dr. Ethan personally designs a fully customised supplementation plan to support your programme.
This process is powered by our proprietary AURION™ system — a precision supplementation engine that integrates your bloodwork, medical history, current medications, and lifestyle data. Every recommendation is grounded in your individual biology. If your data changes, your plan changes.
Your programme is structured into precise morning and evening formulations that evolve monthly as your biomarker data evolves. No unnecessary supplements. No conflicting compounds. Full explanation of every recommendation. Full transparency throughout.
The AURION™ Approach
- Designed by Dr. Ethan personally — not a template
- Based exclusively on your bloodwork and health profile
- Integrated with your advisory programme
- AM and PM formulations structured for your routine
- Evolves monthly as your biomarker data changes
- Powered by the AURION™ precision engine
- No unnecessary or conflicting compounds
- Full written explanation of every recommendation
What Advisory Consultations Cover
Physician-Led.
Data-Driven.
The Catalyst Clinic operates across London, New York, and Zürich — offering the world's most clinically rigorous peptide advisory consultations for individuals researching peptide compounds and their potential role in longevity, biological performance, and wellness.
All advisory programmes are physician-led, diagnostics-based, and subject to ongoing oversight by GMC, European and US-registered physicians operating within a fully regulated private medical framework.
Mandatory comprehensive diagnostics before any programme begins — a standard not universally applied across London clinics.
- Longevity & biological ageing research
- Performance & musculoskeletal recovery research
- Cognitive function & neuropeptide research
- Metabolic health & body composition research
- Gut health & inflammatory biology research
- Growth hormone axis research
Innovative Delivery Technology
Injectable Pen Delivery
The Catalyst Clinic is the first clinic in London to provide compounds in injectable pens — accurate, consistent, and straightforward dosing without the complexity of traditional syringe-based approaches.
- Accurate dosing every time
- GMP-certified, FDA-regulated compounding pharmacy sourcing
- GMP-certified, EMA-regulated compounding pharmacy sourcing
- Minimal preparation and equipment required
- Faster, simpler, more comfortable administration
Blood Diagnostics Matter
Bloodwork is essential before any advisory consultation. It provides a baseline, uncovers imbalances, and ensures every programme is grounded in your individual biology. Learn about our diagnostics →
What Patients Tell Us
Why Patients Choose The Catalyst Clinic
Over Every Other London Advisory Clinic
Many patients arrive at The Catalyst Clinic after feeling that previous consultations lacked diagnostics, physician oversight, or ongoing monitoring. These are the most common concerns they raise — and the reason The Catalyst Clinic was built.
Most Common Concern
"My previous clinic didn't do bloodwork first."
At The Catalyst Clinic, comprehensive blood diagnostics are mandatory before any advisory consultation takes place. This is not optional. It is applied to every patient without exception — because no responsible advisory programme can be designed without baseline data. Period.
Second Most Common
"I never spoke to the doctor — it was delegated."
Dr. Ethan personally reviews your bloodwork, personally designs your advisory programme, personally conducts your induction, and personally oversees your monthly reviews. Every decision is made by the physician who reviewed your results. No delegation. No algorithms. No non-physician staff making decisions.
Third Most Common
"The compounds weren't from a regulated pharmacy."
Every compound discussed within a Catalyst Clinic advisory programme is sourced from GMP-certified, EMA-regulated, and FDA-registered compounding pharmacies. Every compound is accompanied by a certificate of analysis confirming identity, purity, and potency. Verifiable, traceable, non-negotiable.
Fourth Most Common
"There was no follow-up or monitoring after month one."
Every Catalyst Clinic programme includes monthly physician reviews and repeat bloodwork every four to five months. Advisory oversight does not end after your first consultation — it continues for as long as you are with us, with your programme evolving as your data evolves.
Research Compounds — Scientific Reference
Top Peptides — Full Biochemistry
A complete scientific reference for each compound — amino acid sequences, molecular weight, receptor targets, signalling pathways, gene interactions, and mechanism of action. Written for physicians, researchers, and scientifically literate patients who want to understand the biochemistry behind the research.
01
BPC-157
Performance & Recovery
MW: 1,419.5 Da · 15 AA
→02
TB-500
Performance & Recovery
MW: 2,113.3 Da · 17 AA
→03
GHK-Cu
Longevity & Metabolic
MW: 340.4 Da · 3 AA + Cu²⁺
→04
CJC-1295
Longevity & Metabolic
MW: 3,367.9 Da · 29 AA
→05
Ipamorelin
Longevity & Metabolic
MW: 711.9 Da · 5 AA
→06
Epithalon
Longevity & Metabolic
MW: 390.4 Da · 4 AA
→07
Semax
Cognitive & Mood
MW: 813.0 Da · 7 AA
→08
Selank
Cognitive & Mood
MW: 751.9 Da · 7 AA
→09
NAD+
Longevity & Metabolic
MW: 663.4 Da · Dinucleotide
→10
MOTS-c
Longevity & Metabolic
MW: 2,174.5 Da · 16 AA
→11
KPV
Immune & Gut
MW: 355.4 Da · 3 AA
→12
Sermorelin
Longevity & Metabolic
MW: 3,357.9 Da · 29 AA
→13
Humanin
Longevity & Metabolic
MW: 2,687.2 Da · 21 AA
→14
Thymosin Alpha-1
Immune & Gut
MW: 3,108.4 Da · 28 AA
→15
Dihexa
Cognitive & Mood
MW: 686.8 Da · 6 AA derivative
→16
Tesamorelin
Longevity & Metabolic
MW: 5,135.8 Da · 44 AA
→17
LL-37
Performance & Recovery
MW: 4,493.3 Da · 37 AA
→18
Cerebrolysin
Cognitive & Mood
MW: Variable · Peptide mixture
→19
VIP
Immune & Gut
MW: 3,326.8 Da · 28 AA
→20
MK-677
Longevity & Metabolic
MW: 624.8 Da · Non-peptide GHS
→21
Klotho
Longevity & Metabolic
MW: ~130 kDa (full) / ~68 kDa (shed) · Protein/peptide fragment
→22
Pentadeca Arginate
Performance & Recovery
MW: ~1,788 Da · 15 AA (arginine-enriched BPC analogue)
→Common Questions
Frequently Asked
Begin Your Programme
Every programme
begins with
your data.
Ready to explore the current science around peptide compounds within the most rigorous physician-led advisory framework available in the UK? Begin with a discovery consultation — in person at our London, New York, or Zürich clinics, or remotely, anywhere in the world.
Every Programme Includes
- Mandatory pre-consultation bloodwork
- Personal review by Dr. Ethan Hausman-Marquis
- Pharmaceutical-grade sourcing — GMP, EMA, FDA
- Bespoke advisory programme — no templates
- Injectable pen delivery — first in London
- Monthly physician reviews
- Repeat bloodwork every 4–5 months
- Full clinical documentation and transparency
London · 96 Kensington High Street, W8 4SG · +44 (0)20 7801 6347
New York · 154 Grand St, 5th Floor, NY 10013 · +1 (917) 724 8125
Zürich · Bahnhofstrasse 10, 8001 · +41 43 456 2 786
Remote consultations available worldwide
hello@thecatalystclinic.com
The peptide compounds discussed at The Catalyst Clinic 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. The Catalyst Clinic provides physician-led advisory consultations only. Nothing on this page constitutes a treatment recommendation, prescribing guide, or medical advice. All compounds are sourced exclusively from GMP-certified, EMA-regulated, and FDA-registered compounding pharmacies. For our full compliance statement please visit thecatalystclinic.com/compliance-uk.