Peptide Education
What Are Peptides?
Explainer
Peptides explained like you're new to this
Your body is built out of amino acids — 20 small molecules that link together like beads on a string. String a few together and you get a peptide. String hundreds together and it folds into a protein.
Peptides are the short ones — usually anywhere from 2 to 50 amino acids long. Because they are small and specific, they act like messengers: each peptide has a shape that fits a matching receptor on a cell, the way a key fits a lock.
When a peptide docks into its receptor, it triggers a response inside the cell — release growth hormone, start repairing tissue, calm inflammation, burn fat, produce collagen, or dozens of other jobs. Different peptides bind different receptors, which is why each one has a different effect.
The one-line version: peptides = short amino acid chains that bind to receptors and tell the body what to do.
Overview
Structure, function, and use
Structure
A peptide is a chain of amino acids joined by peptide bonds. Under 50 residues is generally called a peptide; longer folded chains are proteins.
Function
Peptides act as hormones, neurotransmitters, growth factors and signaling molecules — binding receptors to trigger a specific cellular response.
Research use
Synthesized to a precise sequence and used in vitro to map receptor activity, validate drug targets, and study biological pathways.
Field guide
Commonly studied research peptides
A short field guide to the peptides researchers ask about most often. Click through for reference material, structure, and sequence data.
Tissue repair and gut lining research.
Cellular repair and recovery studies.
Skin, collagen and wound-healing research.
Triple-agonist metabolic research.
GLP-1 metabolic signaling research.
Growth hormone axis research.
Mitochondrial signaling research.
Melanocortin receptor research.
GHRH analog research.
Ready to work with peptides?
Use our free peptide reconstitution calculator to figure out exactly how much bacteriostatic water to add and how many units to draw on an insulin syringe.
FAQ
Frequently asked questions
What are peptides in simple terms?
Peptides are short chains of amino acids — the same building blocks that make up proteins. Because they are smaller than proteins (usually 2–50 amino acids), they can bind to specific receptors in the body and act as biological signals that tell cells what to do.
What is the difference between a peptide and a protein?
Size. Peptides are short chains, typically fewer than 50 amino acids. Proteins are longer chains that fold into complex 3D structures. A short protein and a long peptide can blur, but in general peptides are smaller, easier to synthesize, and more targeted.
How do peptides work in the body?
Peptides bind to specific receptors on the surface of cells — like a key fitting a lock. When they bind, they trigger a cellular response: releasing a hormone, activating a repair pathway, modulating inflammation, or signaling growth.
Are research peptides the same as pharmaceutical peptides?
Research peptides are synthesized to the same sequence but are sold strictly for in vitro laboratory investigation. They are not FDA-approved drugs and are not intended for human or veterinary use.
What are the most commonly studied research peptides?
Popular research peptides include BPC-157 and TB-500 (tissue repair studies), GHK-Cu (skin and collagen research), Semaglutide and Retatrutide (metabolic research), CJC-1295 and Ipamorelin (growth hormone axis research), and MOTS-c (mitochondrial studies).
How are peptides made?
Most research peptides are produced by solid-phase peptide synthesis (SPPS). Amino acids are added one at a time to a growing chain anchored to a resin, then cleaved, purified by HPLC, and confirmed by mass spectrometry.
How are peptides stored?
Lyophilized (freeze-dried) peptides are stable for months at -20°C and years at -80°C. Once reconstituted with bacteriostatic water, most peptides should be refrigerated at 2–8°C and used within 2–4 weeks.
How do you reconstitute a peptide?
Add bacteriostatic water to the lyophilized vial slowly along the side wall, gently swirl (do not shake), and let it dissolve. Use our peptide reconstitution calculator to get the exact dose per insulin-syringe unit.
For laboratory research use only. Not for human consumption.