A peptide is a short chain of amino acids — the same building blocks as proteins, just fewer of them. In the body, many peptides act as signalling molecules that tell cells what to do, which is why specific peptides are studied for fat loss, recovery, growth, and other targeted effects.

Are research peptides legal and safe?

It depends on the peptide and your country. Some, like Semaglutide, are approved medicines; many others are sold strictly "for research use" and are not approved for human use, and safety varies widely. MeinePeptide is educational only — talk to a qualified clinician before considering any peptide.

How do I calculate a peptide dose and reconstitution?

Use the free reconstitution calculator: enter the vial strength in mg, how much bacteriostatic water you add in ml, and your target dose. It returns the exact volume to draw and the mark to hit on an insulin syringe. Every peptide page links straight to its own calculator.

Is MeinePeptide medical advice?

No. MeinePeptide is an educational reference — not medical advice and not a prescription. Each monograph cites primary research and lists side effects and contraindications, but any decision about use should be made together with a qualified healthcare professional.

Which peptides are the most researched?

The most-studied entries here include Semaglutide and Tirzepatide (GLP-1 weight-loss agonists), BPC-157 and TB-500 (tissue repair), and Ipamorelin and CJC-1295 (growth-hormone peptides). Each has an evidence-graded monograph with dosing protocols, timelines, and citations to the primary literature.

Glowing 3D peptide molecule with laboratory vials

Educational peptide reference

Peptide dictionary for everyone

Browse 58 peptides, learn their mechanisms and protocols, and track personal cycles with confidence — across six languages.

Educational content only. Not medical advice.

Browse the dictionaryDose calculator

Currently studying

SemaglutideTirzepatideBPC-157RetatrutideTB-500HGH (Somatropin)SemaglutideTirzepatideBPC-157RetatrutideTB-500HGH (Somatropin)

What we do

Learn the science and train with a real coach

This is more than a dictionary. We explain how peptides actually work, and a real coach writes the nutrition and training plan that gets you where you want to be.

Learn the science

Clear, well-sourced explanations of how peptides work and how they're used. Written in plain language and kept up to date.

Explore the dictionary

Reach your goal with a real coach

A qualified coach reads your details and writes a nutrition and training plan around your body and your goal. Everything is made for you. Nothing is copied from a template.

Fat lossBuild muscleGain weight

See coaching

Responsible guidance

Thinking about peptides? We help you understand your options and use them safely. We won't tell you what to take or sell you anything. The decision is always yours.

How we work

Most-researched peptides

A curated starting point — by goal and experience level.

Peptide dictionary

Entry № 01Beginner-friendly

Semaglutide

Ozempic · Wegovy

The GLP-1 receptor agonist that turned obesity pharmacology into a mainstream conversation. Once-weekly injection, ~7-day half-life, and the largest randomised dataset of anything in this catalogue.

Fat lossView details

Entry № 02Beginner-friendly

Tirzepatide

Mounjaro · Zepbound

Dual GIP and GLP-1 agonist. Beats Semaglutide head-to-head on weight loss and glycaemic control, and is becoming the default first-line choice when both are available.

Fat lossView details

Entry № 03Intermediate

BPC-157

Body Protection Compound · Pentadecapeptide BPC-157

A 15-amino-acid stretch lifted from a protein in human gastric juice. Best-known use is soft-tissue repair, with a quieter second life as a gut-healing protocol.

Healing & recoveryView details

Entry № 04Advanced

Retatrutide

LY3437943

Triple agonist hitting GIP, GLP-1, and glucagon receptors at once. Phase 2 data shows the largest weight-loss numbers ever reported for a drug in trials — ~24% at 48 weeks.

Fat lossView details

Entry № 05Intermediate

TB-500

Thymosin Beta-4 · TB-4

A synthetic fragment of Thymosin Beta-4 used for systemic tissue repair. Sister peptide to BPC-157, but where BPC works locally, TB-500 spreads.

Healing & recoveryView details

Entry № 06Advanced

HGH (Somatropin)

Somatropin · Human Growth Hormone

Recombinant human growth hormone — the actual hormone itself, not a secretagogue. Powerful for body recomposition, with side effects that scale unmistakably with dose.

Muscle growthView details

Browse by goal

Each goal is a family of peptides — like a small periodic table.

Fat loss

Muscle growth

Healing & recovery

Anti-aging

Cognitive

Sexual health

Sleep

Skin & hair

Anti-inflammatory

Latest articles

Fresh writing from the MeinePeptide editorial desk.

View all articles

A single clear glass vial holding a faintly blue copper peptide solution, lit softly against a cool, dark studio background.

researchJul 5, 2026· 6 min read

GHK-Cu Benefits and Risks: What the Evidence Shows

GHK-Cu is the copper peptide hyped for skin, hair, and longevity. A physician weighs the real benefits, the copper-toxicity question, and where proof stops.

A single clear glass vial on a soft blue background, surrounded by abstract translucent molecular structures, evoking a laboratory research peptide.

researchJul 4, 2026· 5 min read

Does BPC-157 Work? What the Evidence Actually Shows

Does BPC-157 work? Two doctors weigh the lab hype against the human evidence, the safety and quality gaps, and the proven options worth trying first.

Title card for a video on building a retatrutide peptide stack for weight loss.

guideJun 21, 2026· 6 min read

Retatrutide Stack: The Peptides That Fill the Gaps

A doctor explains which peptides fill the gaps in a retatrutide stack, the order that actually matters, and the combinations to avoid for weight loss.

Editorial still life: a clear glass vial beside an abstract muscle-fiber motif in cool teal and deep blue, soft studio lighting, minimalist composition, no text, no faces.

researchJun 14, 2026· 6 min read

Retatrutide and Muscle Loss: What the DEXA Data Shows

Retatrutide muscle loss is real but overstated: a third of the weight lost is lean mass, yet a DEXA scan cannot tell real muscle from water and glycogen.

Glass laboratory vial on a reflective surface with a faint molecular peptide-chain motif and soft DNA helix in the background, cool clinical blue-and-teal palette, minimalist studio lighting.

researchJun 11, 2026· 6 min read

Peptide Therapy: The Science, Uses, and Honest Safety

Peptide therapy explained: what Dr. Abud Bakri told Huberman about GLP-1 drugs, BPC-157, and growth hormone peptides, and where the real risks actually are.

Frequently asked questions

Quick, plain-English answers to what people ask most about peptides — and how to use this dictionary.

What is a peptide?: A peptide is a short chain of amino acids — the same building blocks as proteins, just fewer of them. In the body, many peptides act as signalling molecules that tell cells what to do, which is why specific peptides are studied for fat loss, recovery, growth, and other targeted effects.
Are research peptides legal and safe?: It depends on the peptide and your country. Some, like Semaglutide, are approved medicines; many others are sold strictly "for research use" and are not approved for human use, and safety varies widely. MeinePeptide is educational only — talk to a qualified clinician before considering any peptide.
How do I calculate a peptide dose and reconstitution?: Use the free reconstitution calculator: enter the vial strength in mg, how much bacteriostatic water you add in ml, and your target dose. It returns the exact volume to draw and the mark to hit on an insulin syringe. Every peptide page links straight to its own calculator.
Is MeinePeptide medical advice?: No. MeinePeptide is an educational reference — not medical advice and not a prescription. Each monograph cites primary research and lists side effects and contraindications, but any decision about use should be made together with a qualified healthcare professional.
Which peptides are the most researched?: The most-studied entries here include Semaglutide and Tirzepatide (GLP-1 weight-loss agonists), BPC-157 and TB-500 (tissue repair), and Ipamorelin and CJC-1295 (growth-hormone peptides). Each has an evidence-graded monograph with dosing protocols, timelines, and citations to the primary literature.

Educational content only. Not medical advice.

Start your first cycle in 90 seconds.

Pick a peptide. Choose a protocol. Set your schedule. We handle the reminders and the math.

Create an account