London · New York · Zürich
Peptide Therapy
Clinic London
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 two published works specifically in this field. Every consultation begins with mandatory comprehensive bloodwork, and we offer optional comprehensive genetic and genomic testing for patients who want DNA-level preventive precision. No advisory program 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 monthsProgram evolves with your data
Source Standards
GMP-CertifiedEMA-regulated · FDA-registered· European-prescribed
Physician Credentials
PhD-LevelThe only published peptide physician-scientist in Europe
Genetic & Genomic Testing
Optional Add-OnDNA-level precision · feeds AURION™ · counseling included
Program Price
From £600/monthInitial consultation £250 · 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. Genetic testing is optional and provided as accredited clinical diagnostic testing.
The Science
What Are Peptides?
Peptides are short chains of amino acids — the fundamental building blocks of proteins. They occur naturally throughout the human body, where they act as signaling molecules, instructing cells to carry out specific biological functions.
Because peptides are involved in a vast range of physiological processes — from tissue repair and metabolic regulation to neurological signaling and immune modulation — they represent one of the most active and promising areas of contemporary biological research.
At The Catalyst Clinic, our advisory consultations are grounded in the current scientific literature surrounding these compounds. Dr. Ethan Hausman-Marquis has spent nearly two decades researching peptide biology and has published two books in the field.
It is important to understand that the compounds discussed are research compounds. They are not licensed medicines, and our role is advisory — helping scientifically curious patients understand the research in the context of their own biomarker data.
Key Characteristics
- Short chains of amino acids (typically 2–50)
- Naturally occurring signaling molecules
- Highly specific biological interactions
- Active area of regenerative research
- Studied across multiple physiological systems
- Not licensed medicines under UK regulations
Advisory Programs Tailored To Your Biology
Choose Your Program
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 program is bespoke — no two patients receive the same advisory protocol, because no two patients have the same biology. Optional genetic and genomic testing can add a further, DNA-level layer of preventive precision to any program.
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 signaling pathways.
- Neuropeptide research
- Neurological signaling investigation
- Neuroplasticity research
- Mood-related biological systems
Longevity & Metabolic
A growing area of scientific inquiry 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 aging pathways.
- Biological aging 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, signaling, and regenerative research.
Follow BPC-157, Semax, and GHK-Cu through their proposed biological interactions — created by Dr. Ethan Hausman-Marquis
The Podcast
The Science of Ageless Living
The UK's Leading Peptide Research Podcast
Hosted by Dr. Ethan Hausman-Marquis — doctor and medical scientist with a PhD, Cell and Genomic Biology and one of the world's leading peptide researchers. The Science of Ageless Living is a leading podcast dedicated to peptide research, longevity science, and biological optimization — 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 two 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.
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 & Genetic Testing
Every program 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 program can be designed. Optional comprehensive preventive DNA testing can be added to build a lifelong genetic baseline alongside your bloodwork.
- Complete Blood Count (CBC)
- Comprehensive Metabolic Panel
- Full hormone panel including sex hormones
- Inflammatory markers
- Comprehensive preventive DNA testing (optional)
- 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 personalized advisory program designed around your data. No two protocols at The Catalyst Clinic are identical. Every recommendation is documented, explained, and traceable.
- Personalized 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 program. Monthly physician reviews are included as standard. Bloodwork is repeated every four to five months.
- Detailed induction session
- Monthly progress reviews
- Program adjustments based on data
- Repeat bloodwork every 4–5 months
Step 05
Strategic Cycling
Advisory programs at The Catalyst Clinic are designed with cyclicity — preventing biological adaptation, maintaining natural hormonal homeostasis, and optimizing long-term outcomes.
- Prevents biological adaptation
- Maintains natural homeostasis
- Avoids endocrine complications
- Optimizes long-term program design
Step 06
Full Transparency
Every decision is documented, explained, and traceable. You will receive full written documentation of your advisory program and the scientific rationale behind every recommendation.
- Full medical history discussion
- Medication interaction screening
- Open communication channels throughout
- Educational approach at every stage
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
L-Glutathione
Longevity & Metabolic
MW: 307.3 Da · 3 AA
→22
Pentadeca Arginate
Performance & Recovery
MW: ~1,600 Da · 15 AA salt
→23
AOD-9604
Longevity & Metabolic
MW: 1,815.1 Da · 16 AA
→24
FOXO4-DRI
Longevity & Metabolic
MW: ~5,200 Da · 47 AA (DRI)
→25
Kisspeptin
Longevity & Metabolic
MW: 1,302.5 Da · 10 AA
→26
Follistatin
Performance & Recovery
MW: ~35 kDa · Glycoprotein
→27
ACE-031
Performance & Recovery
MW: ~79 kDa · Fc-fusion
→28
Testagen
Longevity & Metabolic
MW: ~446 Da · 4 AA
→What We Consult On
Areas of Research Interest
Our advisory consultations span the primary domains of peptide compound research. Each area is approached through the lens of your individual biomarker data.
- Tissue repair and musculoskeletal recovery research
- Metabolic and mitochondrial pathway investigation
- Neurological and cognitive signaling research
- Longevity and biological aging pathways
- Immune modulation and gut health research
- Hormonal optimization and endocrine support
- Sleep architecture and recovery biology
- Skin, hair, and aesthetic-related research
Published Works
Literature by Dr. Ethan
Three published works grounded in nearly two decades of peptide research — written to give patients and practitioners the scientific context behind this rapidly evolving field.
Book One
Exploring the World of Peptides
A comprehensive guide to the multifaceted role of peptides in biology, medicine, fitness, and skincare. Beginning with the fundamentals — what peptides are and how they differ from amino acids and proteins — it explores their applications across therapeutic medicine, performance and recovery, and anti-aging skin health, alongside the synthesis methods behind them. 397 pages · published January 2025.
Book Two
Peptide-Based Cancer Therapies
An exploration of the innovative role of peptides in cancer treatment and their potential for targeted therapies with reduced toxicity. Covers hormone analogs, somatostatin analogs, peptide vaccines, peptide-drug conjugates, cell-penetrating and anti-angiogenic peptides, and diagnostic peptides in tumor imaging — closing with the field's challenges and future directions. 95 pages · published January 2025.
Book Three
The Peptide Encyclopedia
The definitive guide to the science and clinical application of peptides — the body's own molecular messengers that heal, regulate, and rejuvenate. Tracing the field from the discovery of insulin to designer peptides like BPC-157, Epithalon, and MOTS-C, it features an A–Z reference of 50 key therapeutic peptides with molecular structure, mechanisms, and dosing. 463 pages · published June 2026.
Reading either work before your consultation is encouraged — an informed patient is always a better-served patient.
Dr. Ethan Hausman-Marquis
PhD, Cell & Genomic Biology
- PhD in Cell and Genomic Biology
- ~20 years peptide research experience
- Two published books in the field
- GMC, European & US-registered
- Host of The Science of Ageless Living
The Physician
"Every patient deserves a consultation grounded in their own biology — not a template, not an algorithm, and never a recommendation made without data."
Dr. Ethan Hausman-Marquis is one of the world's leading peptide researchers and the only internationally published peptide physician practicing in London. With a PhD in Cell and Genomic Biology and nearly two decades of specialist research, he personally oversees every consultation at The Catalyst Clinic.
His approach is defined by scientific rigor and radical transparency: mandatory diagnostics, personal review of every result, and continuous clinical oversight throughout your program.
Common Questions
Frequently Asked Questions
Begin
Start With Your Biology
Every journey at The Catalyst Clinic begins the same way: with your data. Book an initial consultation and take the first step toward a genuinely personalized, physician-led advisory program.
What's Included
- 60-minute physician consultation
- Personal review of your diagnostics
- Bespoke advisory protocol
- Monthly reviews included
- Full written documentation
The Catalyst Clinic
London · New York · Zürich
Remote consultations worldwide
The Catalyst Clinic operates within a fully regulated private medical framework. Compounds referenced on this website are research compounds and are not licensed medicines under the Human Medicines Regulations 2012. Nothing on this website constitutes medical advice, diagnosis, or a treatment recommendation. All consultations are advisory and conducted by registered physicians. Genetic testing is provided as accredited clinical diagnostic testing with counseling included.