The Complete Peptide Glossary: 50+ Terms Every Canadian Researcher Should Know

Peptide glossary research terminology Durham Peptides Canada

Peptide research operates at the intersection of biochemistry, pharmacology, manufacturing, regulatory affairs, and quality control — and each of these fields has its own vocabulary. Researchers new to the peptide space often encounter the same problem: a single product page or COA can contain a dozen acronyms and technical terms, each one assuming the reader already knows what it means.

This glossary is designed to fix that. The terms below are organized alphabetically and explained in plain language, with internal links to deeper coverage of each concept. Bookmark this page as a reference — you'll return to it.

For the foundational overview of peptide science, see What Are Peptides? A Beginner's Guide to Understanding Peptide Research.

Acidulant. A general term for any acidic compound. In peptide manufacturing context, acidulants are sometimes used in synthesis or formulation steps. Not commonly encountered on Janoshik COAs.

Acetate. A chemical group (CH3COO⁻) often present in peptide formulations as a counterion (peptide acetate salt). Most modern research peptides are sold as acetate salts because acetate is biologically benign and standard in research peptide manufacturing.

Agonist. A molecule that binds to a receptor and activates it, producing a biological

response. Contrast with antagonist (which blocks the receptor). Semaglutide is a GLP-1 receptor agonist; tirzepatide is a dual agonist; retatrutide is a triple agonist. See Triple Agonist Peptides Explained.

Amino Acid. The building blocks of peptides and proteins. There are 20 standard amino acids that make up natural peptides, plus various non-standard amino acids used in modified research peptides. Each amino acid has a single-letter and three-letter abbreviation.

Amino Acid Substitution. Replacing a specific amino acid in a peptide with a different amino acid, usually to extend half-life or improve receptor binding. A common modification strategy in modern research peptides like tirzepatide.

Amylin. A 37-amino-acid peptide hormone co-secreted with insulin. Amylin analogs like cagrilintide are an emerging research category. See What Is Cagrilintide?.

Angiogenesis. The biological process of forming new blood vessels. Several research peptides, including BPC-157 and components of the GLOW Blend, are studied for their investigated effects on angiogenesis.

Antagonist. A molecule that binds to a receptor and blocks it, preventing activation. Opposite of agonist. The frequent search term "triple antagonist peptide" is a misspelling of "triple agonist" — see Triple Agonist Peptides Explained.

Bacteriostatic Water (BAC water, BWFI). Sterile water containing 0.9% benzyl alcohol as a preservative, used to reconstitute lyophilized peptides. Different from regular sterile water — only bacteriostatic water should be used for peptide reconstitution. See What Is Bacteriostatic Water?.

BPC-157. Body Protection Compound-157. A synthetic 15-amino-acid peptide derived from a protein originally identified in human gastric juice. One of the most-studied peptides in preclinical tissue-repair research. See What Is BPC-157?.

Buyer's Guide. Educational content explaining how to purchase a specific peptide responsibly. See How to Buy Peptides in Canada: A Complete Guide for 2026.

Cagrilintide. A long-acting amylin analog with approximately 7-8 day half-life. Most studied in combination with semaglutide as CagriSema. See What Is Cagrilintide?.

CagriSema. A combination research formulation of cagrilintide + semaglutide. Engages amylin and GLP-1 receptors simultaneously through a once-weekly protocol.

Calcitonin Receptor. A receptor in the calcitonin family that responds to calcitonin and to amylin (in heterodimer form with receptor activity-modifying proteins). Cagrilintide acts on calcitonin and amylin receptors.

Certificate of Analysis (COA). A document from an analytical testing laboratory verifying the identity, purity, and other quality parameters of a research peptide. The Janoshik Analytical COA is the recognized standard in research peptide quality verification. See How to Read a Janoshik COA.

CJC-1295. A long-acting GHRH analog. Two versions exist — with DAC (~6-8 day half-life) and without DAC (~30 minute half-life). See Sermorelin, CJC-1295, and Ipamorelin: A Research Overview of Growth Hormone Peptides.

Conjugation. Chemical attachment of one molecule to another. In peptide research, fatty acid conjugation is a common modification strategy that extends half-life by allowing albumin binding.

Copper Peptide. A peptide complexed with copper ions. The most-studied copper peptide is GHK-Cu. See Copper Peptides Explained.

Cyclic Peptide. A peptide whose structure forms a ring rather than a linear chain. Cyclization protects peptides from exopeptidase degradation and often extends half-life.

DAC (Drug Affinity Complex). A chemical modification used in CJC-1295 with DAC that allows reversible albumin binding, extending the peptide's half-life from ~30 minutes (without DAC) to ~6-8 days (with DAC).

Dipeptide. A peptide consisting of two amino acids joined by one peptide bond. The shortest possible peptide structure.

Dipeptidyl Peptidase-4 (DPP-4). An enzyme that rapidly degrades native GLP-1, contributing to its short half-life. Modern GLP-1 receptor agonists are designed with modifications that resist DPP-4 cleavage.

Dose. In research peptide context, the per-research-unit amount used in a specific protocol. Calculated from peptide concentration in the reconstituted vial and the syringe units drawn. See Peptide Reconstitution Calculator Guide.

Dual Agonist. A peptide that activates two different receptors simultaneously. Tirzepatide is a dual GLP-1/GIP agonist. See What Is Tirzepatide?.

Endogenous. Originating from within the body. Endogenous GH release means GH released by the body's own pituitary gland (in contrast to exogenous administered GH).

Excipient. Inactive ingredients added to a peptide formulation for stability or other purposes. Lyophilized peptides may contain mannitol or other excipients.

Fatty Acid Conjugation. Attachment of a fatty acid chain to a peptide, allowing reversible binding to albumin and dramatic extension of half-life. The strategy underlying semaglutide, tirzepatide, retatrutide, and cagrilintide. See Peptide Half-Life Explained.

FDA Pharmacy Compounding Advisory Committee (PCAC). A US FDA committee that reviews compounds for inclusion on or removal from compounding pharmacy lists. The July 2026 PCAC review of several research peptides is a significant ongoing regulatory event. See FDA Peptide Reclassification 2026: What It Means for Canadian Researchers.

Freeze-Drying. See Lyophilization.

Gauge (needle). A measure of needle thickness. Higher gauge numbers indicate thinner needles. Peptide research typically uses 29-31 gauge needles. See Peptide Insulin Syringes Guide.

GHK-Cu. Glycyl-L-histidyl-L-lysine copper. A naturally occurring tripeptide-copper complex with over 100 published research studies. See GHK-Cu: The Anti-Aging Copper Peptide with Over 100 Published Studies.

Ghrelin. A peptide hormone that stimulates GH release through the GHSR-1a receptor. Synthetic ghrelin mimetics like ipamorelin are research peptides in the growth hormone peptide category.

GHRH (Growth Hormone-Releasing Hormone). A hypothalamic peptide that stimulates GH release from the pituitary. Sermorelin and CJC-1295 are GHRH analogs. See Growth Hormone Peptides Research Overview.

GIP (Glucose-Dependent Insulinotropic Polypeptide). An incretin hormone. Tirzepatide and retatrutide both activate the GIP receptor.

GLOW Blend. Durham Peptides' three-peptide formulation containing 50mg GHK-Cu + 10mg BPC-157 + 10mg TB-500. See GLOW Blend Composition: Why GHK-Cu + BPC-157 + TB-500 Work Together.

GLP-1 (Glucagon-Like Peptide-1). An incretin hormone. GLP-1 receptor agonists like semaglutide are the foundation of modern metabolic peptide research.

GLP-3. An informal community term for "third-generation GLP-class peptide" — typically referring to retatrutide and other triple agonists. Not an established receptor name. See Triple Agonist Peptides Explained.

Glucagon Receptor. A receptor that responds to glucagon. Activated by retatrutide as part of its triple agonist mechanism.

Half-Life (t½). The time required for the plasma concentration of a peptide to fall to half its initial value after administration. See Peptide Half-Life Explained: Why Some Peptides Last Hours and Others Days.

Health Canada. The Canadian federal department responsible for health policy and regulation. Research peptides are not approved by Health Canada for human or veterinary therapeutic use; they are sold for laboratory use only.

HPLC (High-Performance Liquid Chromatography). An analytical chemistry technique used to measure peptide purity. The ≥99% HPLC purity standard is the research-grade benchmark. See What Is HPLC? The Science Behind Peptide Purity Testing.

Identity Confirmation. Verification that a peptide is what its label claims, typically through mass spectrometry analysis on the Janoshik COA showing the molecular weight matches the expected value.

Incretin. A class of hormones (including GLP-1 and GIP) that stimulate insulin secretion from pancreatic beta cells in response to food intake. Modern metabolic peptides target incretin receptors.

Insulin Syringe. A syringe calibrated for insulin administration but widely used for peptide

research due to its small volume and unit-marked calibration. U-100 is the standard for peptide research math. See Peptide Insulin Syringes Guide.

Ipamorelin. A synthetic pentapeptide ghrelin mimetic studied for selective GH release through the GHSR-1a receptor. See Growth Hormone Peptides Research Overview.

Janoshik Analytical. An independent peptide testing laboratory whose Certificates of Analysis are widely recognized as the research-grade standard for peptide quality verification. See How to Verify a Janoshik Test Report Unique Key.

Lyophilization (Freeze-Drying). A manufacturing process that removes water from a peptide solution at low temperature under vacuum, producing a stable dry powder. Modern research peptides are sold in lyophilized form. See What Is Lyophilization? Why Every Research Peptide Is Freeze-Dried.

Mass Spectrometry (MS). An analytical technique that measures the molecular weight of a compound. Used in research peptide quality control to confirm peptide identity. See How to Read a Janoshik COA.

Microgram (mcg or μg). One-thousandth of a milligram. 1 mg = 1000 mcg. Research peptide doses are commonly expressed in mcg.

Milligram (mg). One-thousandth of a gram. Research peptide vial contents are typically labeled in mg (e.g., 10mg BPC-157, 50mg GHK-Cu).

MOTS-c. Mitochondrial-derived peptide of 16 amino acids. Studied in mitochondrial biology and longevity research. See What Is MOTS-c? The Mitochondrial Peptide Reshaping Longevity Research.

Net Peptide Content. The actual peptide mass in a vial after accounting for counterion mass (acetate salt, water of hydration, etc.). May differ slightly from the labeled vial mass. Reported on most Janoshik COAs.

Pentadecapeptide. A peptide consisting of 15 amino acids. BPC-157 is a pentadecapeptide.

Pentapeptide. A peptide consisting of 5 amino acids. Ipamorelin is a pentapeptide.

Peptide. A short chain of amino acids (typically 2-50) connected by peptide bonds. Distinguished from proteins, which are larger amino acid chains. See What Are Peptides? A Beginner's Guide.

Peptide Bond. The chemical bond connecting two amino acids. Formed by condensation between the carboxyl group of one amino acid and the amino group of the next.

Pharmacokinetics (PK). The study of how a compound is absorbed, distributed, metabolized, and eliminated in a biological system. Peptide pharmacokinetics is dominated by enzymatic degradation considerations. See Peptide Half-Life Explained.

Pramlintide. A first-generation amylin analog with short half-life (~50 minutes). The predecessor to long-acting cagrilintide.

Pulsatile Release. The natural pattern in which some hormones (including GH) are released in brief pulses rather than continuously. Some research peptides like sermorelin are designed to mimic this pattern.

Purity. The percentage of a peptide preparation that consists of the intended peptide compound, with the remainder being impurities (related peptides, truncated fragments, manufacturing byproducts). The ≥99% HPLC purity standard is the research-grade benchmark. See Peptide Purity: Why 99% Matters.

Reconstitution. The process of dissolving a lyophilized peptide in bacteriostatic water to produce a usable research solution. See How to Reconstitute Peptides.

Receptor. A protein on or in cells that responds to specific molecular signals (including peptides) and triggers biological responses.

Research-Use-Only. A regulatory designation indicating a product is intended for laboratory and research applications, not for human or veterinary therapeutic use. All Durham Peptides products are research-use-only.

Retatrutide. A triple agonist peptide (GLP-1, GIP, and glucagon receptors). The reference compound for the triple agonist peptide category. See What Is Retatrutide?.

Semaglutide. A long-acting GLP-1 receptor agonist with ~7-day half-life. Single agonist. See What Is Semaglutide?.

Sermorelin. A 29-amino-acid GHRH analog with very short half-life (~10-20 minutes). The first-generation GHRH analog research compound. See Growth Hormone Peptides Research Overview.

Single Agonist. A peptide that activates a single receptor. Semaglutide is a single GLP-1 agonist.

Solid-Phase Peptide Synthesis (SPPS). The dominant modern method for manufacturing research peptides. Uses synthetic amino acids assembled on a solid resin support. Produces fully synthetic peptides with no animal-derived materials. See Vegan Peptides: Why It Matters and How Synthetic Manufacturing Changed Everything.

Somatostatin. A hypothalamic peptide that inhibits GH release. Counter-regulator to GHRH in the natural GH release system.

Subcutaneous (SC). Beneath the skin. Subcutaneous administration is the most common route for research peptide protocols.

Synthetic. Manufactured rather than extracted from natural sources. Modern research peptides are synthetic via SPPS.

TB-500. A synthetic fragment derived from Thymosin Beta-4. Studied in tissue-repair research. See TB-500: The Recovery Peptide Behind the Wolverine Stack.

Tirzepatide. A dual GLP-1/GIP receptor agonist with ~5-day half-life. Reference compound for the dual agonist category. See What Is Tirzepatide?.

Tripeptide. A peptide consisting of three amino acids. GHK (the peptide portion of GHK-Cu) is a tripeptide.

Triple Agonist. A peptide that activates three different receptors simultaneously. Retatrutide is the reference triple agonist (GLP-1, GIP, glucagon). See Triple Agonist Peptides Explained.

U-100. A syringe calibration standard for U-100 insulin (100 units/mL). The standard for peptide research math. On a U-100 syringe, 100 units = 1.0 mL. See Peptide Insulin Syringes Guide.

U-40. A different syringe calibration (40 units/mL) used in some veterinary insulins. Should not be used for peptide research where U-100 math is assumed.

Unique Key. A verification code on Janoshik Certificates of Analysis that allows

independent verification of the test report at janoshik.com/verify. See How to Verify a Janoshik Test Report Unique Key.

Unit (syringe). A graduated mark on an insulin syringe. On a U-100 syringe, 1 unit = 0.01 mL.

Vegan Peptide. A peptide manufactured without animal-derived materials, achieved through Solid-Phase Peptide Synthesis with synthetic amino acids. Modern research peptides including all Durham Peptides products are vegan. See Vegan Peptides.

Wolverine Stack. Durham Peptides' two-peptide formulation containing 5mg BPC-157 + 5mg TB-500. See The Wolverine Stack Explained: BPC-157 + TB-500.

Frequently Asked Questions

What's the difference between a peptide and a protein? Peptides are typically 2-50 amino acids; proteins are larger amino acid chains (often 50-1000+). The distinction is somewhat arbitrary, but peptide research generally refers to compounds in the smaller range.

What's the difference between mg and mcg? 1 mg = 1000 mcg. Research peptide vials are typically labeled in mg; per-research-unit amounts are often specified in mcg.

What does "research-use-only" mean? A regulatory designation indicating the product is sold for laboratory and research applications, not for human or veterinary therapeutic use. It is not a quality designation — it reflects the regulatory category, not the manufacturing standard.

What does HPLC measure? HPLC (High-Performance Liquid Chromatography) measures the purity of a peptide preparation by separating components based on their chemical properties. ≥99% HPLC purity is the research-grade standard.

What does mass spec measure? Mass spectrometry measures the molecular weight of a peptide, used to confirm the identity of the compound matches the expected molecular weight of the labeled peptide.

What's the difference between an agonist and an antagonist? An agonist activates a receptor, producing a biological response. An antagonist blocks a receptor, preventing activation. Most research peptides in the metabolic and recovery categories are agonists.

What does SPPS stand for? Solid-Phase Peptide Synthesis — the dominant modern method for manufacturing research peptides using synthetic amino acids on a resin support.

What's a U-100 insulin syringe? A syringe calibrated for U-100 insulin concentration (100 units/mL). The standard for peptide research math, where 100 units = 1.0 mL.

What's the difference between lyophilized and reconstituted peptide? Lyophilized peptide is the freeze-dried powder form sold in vials. Reconstituted peptide is the lyophilized powder dissolved in bacteriostatic water for use in research protocols.

What does t½ or half-life mean? The time required for the plasma concentration of a peptide to fall to half its initial value after administration. See Peptide Half-Life Explained.

What is a Janoshik COA? A Certificate of Analysis from Janoshik Analytical, an independent peptide testing laboratory. The widely recognized standard for research peptide quality verification.

What's the difference between a single, dual, and triple agonist? Single agonists activate one receptor; dual agonists activate two; triple agonists activate three. The distinction reflects the number of distinct receptor pathways engaged simultaneously.

Final Thoughts

The vocabulary of peptide research can be overwhelming on first encounter, but most terms are simpler than they sound once explained. This glossary is designed to be a reference researchers return to as questions arise during peptide work — not a one-time read.

For deeper coverage of any term, follow the internal links throughout the glossary. The foundational starting points are What Are Peptides? A Beginner's Guide, How to Read a Janoshik COA, and Peptide Reconstitution Calculator Guide.

For Canadian researchers entering the peptide field for the first time, the practical

sequence is:

1. Understand the foundational science — What Are Peptides?

2. Learn how to evaluate suppliers — 5 Things to Look for in a Canadian Peptide Supplier and Peptides for Sale in Canada

3. Learn how to verify quality — How to Read a Janoshik COA and How to Verify a Janoshik Test Report Unique Key

4. Learn the reconstitution math — Peptide Reconstitution Calculator Guide or use the Durham Peptides peptide calculator

5. Learn the physical reconstitution protocol — How to Reconstitute Peptides

Browse the complete Durham Peptides catalog at durhampeptides.ca/category/all-products. For our Lab Results archive including current Janoshik COA data, see durhampeptides.ca/lab-results.

Selected References

1. International Union of Pure and Applied Chemistry. IUPAC Nomenclature of Organic Chemistry. Standard reference for peptide and amino acid nomenclature.

2. International Council for Harmonisation. ICH Q6A: Specifications: Test Procedures and Acceptance Criteria for New Drug Substances and New Drug Products. Standards on peptide quality testing.

3. United States Pharmacopeia. USP General Chapters on Peptide Drug Substances. Pharmacopeial standards for peptide manufacturing and quality.

4. Lau JL, Dunn MK. Therapeutic Peptides: Historical Perspectives, Current Development Trends, and Future Directions. Bioorganic & Medicinal Chemistry. 2018;26(10):2700-2707. https://pubmed.ncbi.nlm.nih.gov/28720325/

5. Fosgerau K, Hoffmann T. Peptide Therapeutics: Current Status and Future Directions. Drug Discovery Today. 2015;20(1):122-128. https://pubmed.ncbi.nlm.nih.gov/25450771/

All products sold by Durham Peptides are for research and laboratory use only. They are not intended for human or animal consumption, diagnosis, treatment, cure, or prevention of any disease. This glossary is informational and intended as a reference resource for Canadian researchers; it does not constitute medical advice.