Peptide United

Peptide research encyclopedia

The Gold Standard
for Peptide Research.

Evidence-based profiles for 100+ peptides. Mechanisms of action, pharmacokinetics, and direct links to PubMed-indexed studies — written for practitioners and researchers, not marketing departments.

1,200+ PubMed citations linkedEvidence-rated profilesFree access, always

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102

Peptide profiles

16

Research categories

1,200+

PubMed studies linked

Free

Core access, always

Quick reference

What are research peptides?

Research peptides are short chains of amino acids — typically 2 to 50 residues — studied for their roles in tissue repair, immune regulation, hormone secretion, and neurological function. Unlike small-molecule drugs, they act with high receptor specificity and degrade naturally into amino acids. Most are administered subcutaneously due to low oral bioavailability.

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Categories covered

Growth hormone secretagogues

GHRP-2, Ipamorelin, CJC-1295, Tesamorelin

Tissue repair and wound healing

BPC-157, TB-500, GHK-Cu

Metabolic and GLP-1 analogs

Semaglutide, Tirzepatide, Retatrutide, AOD-9604

Cognitive function

Semax, Selank, Dihexa

Immune modulation

Thymosin Alpha-1, KPV, LL-37

Longevity and telomere biology

Epithalon, MOTS-c, Humanin

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Research areas

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20 peptides

Anti-Aging & Longevity

Peptides studied for cellular repair, telomere maintenance, and extending healthspan.

🦠4 peptides

Antimicrobial

Peptides with antibacterial, antifungal, or antiviral properties.

🫀19 peptides

Cardiovascular

Peptides studied for heart health, blood pressure regulation, and vascular function.

🧠23 peptides

Cognitive Enhancement

Peptides studied for neuroprotection, memory, focus, and neuroplasticity.

21 peptides

Fat Loss & Metabolic

Peptides involved in lipolysis, metabolic rate, insulin sensitivity, and body composition.

💊11 peptides

GLP-1 & Metabolic Hormones

GLP-1 receptor agonists and related peptide hormones studied for diabetes, obesity, and metabolism.

📈16 peptides

Growth Hormone Axis

Peptides that stimulate growth hormone release or enhance the GH/IGF-1 axis.

🔬15 peptides

Healing & Recovery

Peptides researched for accelerating tissue repair, wound healing, and post-injury recovery.

🛡️13 peptides

Immune Support

Peptides that modulate or enhance immune system function and resilience.

⚙️4 peptides

Mitochondrial Health

Peptides that target mitochondrial function, biogenesis, and cellular energy.

💪10 peptides

Muscle & Performance

Peptides researched for muscle growth, strength, and athletic performance.

🔷13 peptides

Neuroprotection

Peptides researched for protecting against neurodegeneration and brain injury.

🔥9 peptides

Pain & Inflammation

Peptides researched for analgesic effects and reducing inflammatory pathways.

❤️6 peptides

Sexual Health

Peptides researched for sexual function, libido, and reproductive health.

12 peptides

Skin & Cosmetic

Peptides used in dermatology and cosmetics for collagen synthesis, wrinkle reduction, and skin repair.

🌙5 peptides

Sleep & Circadian

Peptides that influence sleep quality, circadian rhythm, and recovery during sleep.

Specimen index

Explore peptides

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ACE-031

Phase II

ACVR2B-Fc · Bimagrumab-precursor

ACE-031 is a fusion protein of the extracellular domain of activin type IIB receptor (ACVR2B) fused to human IgG1 Fc. It acts as a myostatin/activin trap, sequestering multiple TGF-β superfamily ligands (myostatin, GDF-11, activin A) that inhibit muscle growth. Phase 2 trials in Duchenne muscular dystrophy showed significant lean muscle mass gains before being halted for safety signals (nosebleeds, telangiectasias). Related compound bimagrumab continues development.

Muscle & Performance

ACTH

Approved

Adrenocorticotropic Hormone · Corticotropin

ACTH is a 39-amino-acid peptide hormone released by the anterior pituitary in response to CRH. Its primary role is stimulating the adrenal cortex to produce cortisol, but it also has direct melanotropic and lipolytic effects. Synthetic forms (cosyntropin) are used diagnostically for adrenal insufficiency testing. Longer-acting formulations (H.P. Acthar Gel) are approved for multiple sclerosis relapses, infantile spasms, and various inflammatory conditions.

Anti-Aging & LongevityHealing & Recovery

Adrenomedullin

Phase II

AM

Adrenomedullin is a 52-amino-acid vasoactive peptide originally isolated from human pheochromocytoma. It is a potent vasodilator acting through CGRP receptors, promotes natriuresis, reduces inflammation, protects vascular endothelial barrier function, and enhances wound healing. Circulating AM levels rise in heart failure, sepsis, and critical illness — making it both a biomarker and emerging therapeutic target.

CardiovascularHealing & Recovery

Angiotensin 1-7

Phase II

Ang(1-7) · A779 counter-regulatory

Angiotensin 1-7 is a 7-amino-acid peptide of the renin-angiotensin system (RAS) and the primary product of ACE2 enzyme activity. It opposes the vasoconstrictive, pro-inflammatory actions of Angiotensin II by acting on the Mas receptor — promoting vasodilation, natriuresis, anti-fibrosis, and anti-inflammation. Extensively studied for heart failure, hypertension, and COVID-19, it represents the counter-regulatory arm of the RAS.

CardiovascularAnti-Aging & Longevity

ANP

Approved

Atrial Natriuretic Peptide · ANF

ANP (Atrial Natriuretic Peptide) is a 28-amino-acid cardiac hormone secreted by atrial cardiomyocytes in response to volume overload. It reduces blood pressure through natriuresis, vasodilation, and inhibition of the RAAS. Carperitide (synthetic ANP) is approved in Japan for acute heart failure. ANP is a key biomarker and drug target for heart failure and hypertension, studied alongside BNP and C-type natriuretic peptide.

Cardiovascular

Anserine

Preclinical

Beta-Alanyl-N-methyl-L-histidine

Anserine is a methylated dipeptide analog of carnosine found in high concentrations in avian and fish muscle. It shares carnosine's pH-buffering and antioxidant properties but shows superior blood-brain barrier penetration. Research highlights potential for cognitive decline prevention, reduction of amyloid-beta toxicity, and improved exercise performance. It is often studied alongside carnosine for synergistic effects.

Anti-Aging & LongevityMuscle & PerformanceNeuroprotection

Editorial standards

How we research

Primary literature first

Every profile starts with a PubMed search, not a product page. We pull primary literature, note the study design — in vitro, animal model, or human trial — and rate the evidence accordingly. You will always know whether a claim comes from a rat study or a randomized controlled trial.

Standardized profile format

Profiles follow a consistent structure: mechanism of action, pharmacokinetics (half-life, bioavailability, routes), clinical evidence with study links, and administration context. The format does not change based on who makes the compound.

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Vetted suppliers appear in our directory because they publish third-party certificates of analysis and pass our sourcing criteria, not because they advertise with us. Research findings are editorially independent of commercial relationships.

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Standardized profiles

Same format, every entry

No paid placements

Supplier directory is editorially independent

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Free summaries cover what a peptide is. Full profiles cover how it works.

The free tier gives you research status, a compound overview, and administration routes. The Researcher plan adds the mechanism of action, pharmacokinetics data, PubMed study links, evidence ratings, and the peptide comparison tool. $12/month.

FREEPeptide summary and research status
FREECategory browsing and search
FREEAdministration routes overview
RESEARCHERFull mechanism of action profile
RESEARCHERPharmacokinetics and half-life data
RESEARCHERPubMed study links and evidence ratings
RESEARCHERPeptide comparison tool

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New PubMed studies across 16 research categories, summarized and linked.

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