PeptideKnow.com
The ultimate source for up-to-date peptide news, regulation, safety, dosages, stacks & research
Explore 128 research peptides across 21 categories — mechanisms of action, dosage protocols, stacking guides, synergistic compounds, and clinical research data.
Tools & Quick Access
Reconstitution Calculator
Calculate bacteriostatic water volumes, syringe units, and body-weight dosing for 20+ peptides.
Open Calculator →Beginner's Guide
New to peptides? Everything you need to know — what they are, how they work, and how to get started safely.
Start Learning →Stacking Guide
7 named protocols — Wolverine, GH Optimization, Gut Healing, Phoenix, and more. Interaction warnings included.
View Stacks →Reconstitution Guide
Step-by-step instructions for mixing lyophilized peptides with bacteriostatic water. Storage & troubleshooting.
Read Guide →Most Popular Peptides
Browse all peptides →BPC-157
PopularBPC-157 is a synthetic 15-amino acid peptide derived from a naturally occurring protective protein isolated from human g...
Semaglutide
PopularSemaglutide is an FDA-approved synthetic 31-amino acid analog of glucagon-like peptide-1 (GLP-1), modified with a C18 fa...
TB-500
PopularTB-500 is a synthetic heptapeptide corresponding to the N-acetylated active fragment (amino acids 17–23) of the endogeno...
Ipamorelin
PopularIpamorelin is a selective synthetic pentapeptide growth hormone secretagogue, developed as part of a major chemistry pro...
MK-677 (Ibutamoren)
PopularMK-677 (ibutamoren) is a potent, orally active, non-peptide GHS-R1a (ghrelin receptor) agonist that mimics ghrelin to st...
Retatrutide
PopularRetatrutide is an investigational first-in-class triple agonist targeting GLP-1, GIP, and glucagon receptors simultaneou...
Epithalon
PopularEpithalon (also spelled Epitalon) is a synthetic tetrapeptide (Ala-Glu-Asp-Gly) that replicates the activity of Epithala...
GHK-Cu
PopularGHK-Cu is a naturally occurring tripeptide copper complex (glycyl-L-histidyl-L-lysine) first identified in human plasma ...
Semax
Semax is a synthetic heptapeptide derived from a fragment of adrenocorticotropic hormone (ACTH 4-7) with an added Pro-Gl...
Ostarine (MK-2866)
PopularOstarine (MK-2866, Enobosarm) is one of the most extensively studied Selective Androgen Receptor Modulators (SARMs). Dev...
Tirzepatide
PopularTirzepatide is an FDA-approved first-in-class dual GIP/GLP-1 receptor agonist peptide that simultaneously activates both...
PT-141
PopularPT-141 (bremelanotide) is an FDA-approved peptide therapy developed from the melanocortin system, derived originally fro...
Guides & Resources
All guides →Routes of Administration
Compare subcutaneous, intramuscular, oral, intranasal, sublingual, and topical delivery. Bioavailability charts and best-use tables.
Peptides vs SARMs
Full comparison of mechanisms, safety profiles, legal status, PCT requirements, and practical use cases for both compound classes.
How Peptides Are Made
Solid-phase synthesis (SPPS), recombinant DNA production, HPLC purification, lyophilization — from lab bench to your vial.
Browse by Category
View all categories →
Growth Hormone Secretagogues
Peptides that stimulate the pituitary gland to release growth hormone, either by mimicking GHRH (GHRH analogs) or by acting on ghrelin receptors (GHRPs).
9 peptides
Healing & Recovery
Peptides studied for tissue repair, wound healing, gut protection, and accelerated recovery from injury.
34 peptides
Sexual Health
Peptides that influence sexual arousal, libido, and reproductive function via central nervous system pathways.
7 peptides
Cognitive & Nootropic
Peptides investigated for memory enhancement, focus, neuroprotection, and cognitive performance.
18 peptides
Anti-Aging & Longevity
Peptides with potential telomere-protective, senolytic, or cellular rejuvenation properties.
28 peptides
Weight Loss & Metabolic
Peptides studied for fat oxidation, appetite regulation, insulin sensitivity, and body composition.
35 peptides
Immune Support
Peptides that modulate T-cell activity, cytokine production, and innate or adaptive immunity.
14 peptides
Skin & Hair
Peptides researched for collagen synthesis, wound healing, skin rejuvenation, and hair follicle health.
7 peptides
Muscle Growth
Peptides that promote myogenesis, satellite cell activation, anti-atrophy signaling, or myostatin inhibition.
16 peptides
Sleep
Peptides studied for sleep quality improvement, circadian rhythm regulation, and stress-induced sleep disturbance.
5 peptides
Pain & Inflammation
Peptides with anti-inflammatory, analgesic, or immune-modulating properties relevant to pain management.
16 peptides
Mitochondrial
Peptides that target mitochondrial function, energy production, cardiolipin integrity, or mitochondrial-nuclear signaling.
6 peptides
Antimicrobial
Cationic peptides with broad-spectrum antibacterial, antifungal, and antiviral activity through membrane disruption.
6 peptides
Neuroprotective
Peptides studied for protection against neurodegeneration, excitotoxicity, and age-related cognitive decline.
22 peptides
Reproductive & Fertility
Peptides that regulate the hypothalamic-pituitary-gonadal axis, gonadotropin secretion, and reproductive function.
1 peptide
Cardiovascular
Peptides with direct cardiovascular effects including natriuretic peptides, vasodilators, and cardioprotective agents.
1 peptide
Gastrointestinal
Peptides regulating GI motility, secretion, appetite, and gut-brain signaling.
1 peptide
Bone & Mineral Metabolism
Peptides regulating bone formation, calcium homeostasis, and mineral metabolism.
0 peptides
Antiviral
Peptides that inhibit viral entry, replication, or immune evasion.
0 peptides
Related Compounds
Non-peptide or next-generation compounds frequently discussed alongside peptides including GLP-1 agonists, dual/triple agonists, and metabolic agents.
10 peptidesSARMs & Androgen Modulators
Selective Androgen Receptor Modulators (SARMs) and related compounds. Included for educational comparison with peptide therapies.
3 peptidesFeatured Peptides
Browse all peptides →Thymosin Alpha-1
Immune Support, Anti-Aging & Longevity
Thymosin Alpha-1 (Tα1) is a 28-amino acid peptide naturally secreted by the thymus gland that plays a central role in T-cell maturation, dif...
LL-37
Antimicrobial, Immune Support, Healing & Recovery
LL-37 is a 37-amino acid cationic antimicrobial peptide (AMP), the only known member of the cathelicidin family in humans. It is generated b...
AOD-9604
Weight Loss & Metabolic
AOD-9604 is a modified peptide fragment corresponding to amino acids 176-191 from the C-terminal region of human growth hormone, with a stab...
Selank
Cognitive & Nootropic, Neuroprotective, Pain & Inflammation
Selank is a synthetic heptapeptide developed by the Institute of Molecular Genetics of the Russian Academy of Sciences. It is based on a fra...
CJC-1295
Growth Hormone Secretagogues, Muscle Growth, Anti-Aging & Longevity
CJC-1295 is a 29-amino acid synthetic analog of growth hormone-releasing hormone (GHRH), structurally based on the first 29 amino acids of n...
Melanotan II
Sexual Health, Skin & Hair
Melanotan II is a synthetic cyclic heptapeptide analog of alpha-melanocyte stimulating hormone (α-MSH). Originally developed at the Universi...
Dihexa
Cognitive & Nootropic, Neuroprotective
Dihexa is a synthetic small peptide derived from angiotensin IV, developed at Washington State University as a hepatocyte growth factor (HGF...
Cerebrolysin
Cognitive & Nootropic, Neuroprotective
Cerebrolysin is a lipid-free neuropeptide preparation produced by standardized enzymatic breakdown of purified porcine brain proteins. The r...
Built for Researchers & Biohackers
Whether you're exploring clinical research or optimizing your own health, PeptideKnow has the data you need.
For Researchers
Amino acid sequences, mechanism of action pathways, clinical trial status, and links to primary literature on PubMed and PubChem.
For Biohackers
Dosage protocols, stacking guides, reconstitution calculators, route-of-administration comparisons, and synergistic compound references.
Latest News & Research
View All Articles →
FDA PCAC July 2026: What the BPC-157 peptide compounding review really means
FDA’s Pharmacy Compounding Advisory Committee will review seven unapproved peptides in July 2026. What that process means for BPC-157—and what it doesn’t....
FDA signals enforcement against unapproved compounded GLP-1 drugs: what it means for peptide medicine
The FDA says it will restrict GLP-1 APIs used in mass-marketed unapproved compounded drugs and crack down on advertising that calls them generic versions of bra...
Sublingual compounded peptides: Quicksome claims and what the FDA’s July 2026 PCAC review could change
A press release claims needle-free, sublingual delivery for popular compounded peptides—just as the FDA's PCAC prepares a July 2026 review of seven peptides....
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Frequently Asked Questions
What is PeptideKnow?
PeptideKnow is an independent reference database covering 114+ research peptides with mechanisms of action, dosage protocols, stacking guides, clinical data, and regulatory news — including FDA compounding rules and 503A/503B policy.
Are research peptides FDA-approved?
Most research peptides such as BPC-157, TB-500, and MOTS-C are not FDA-approved for therapeutic use. The FDA regulates peptide compounding under sections 503A and 503B of the FD&C Act. A small number of peptides (e.g. semaglutide) are approved drugs with specific indications.
Where does PeptideKnow get its data?
PeptideKnow pulls from primary sources: FDA announcements and dockets, PubMed-indexed peptide research, and manufacturer monographs. Every peptide profile cites the underlying studies and every news article links to primary regulatory documents.
How often is PeptideKnow updated?
Peptide profiles are reviewed continuously and the news section is updated daily with the latest FDA regulatory actions, clinical trial results, and industry developments.
About PeptideKnow
PeptideKnow is a free, independent reference database designed to organize and present research-backed information on bioactive peptides. Our database covers growth hormone secretagogues, healing peptides, nootropics, antimicrobial peptides, metabolic agents, and more.
Each entry includes mechanism of action data, synergistic compound cross-references, amino acid sequences, dosage protocols, stacking guides, and links to primary research literature.
Learn More