Reference Guide

PeptideGlossary

A comprehensive dictionary of peptide terminology. The Peptide Prime app includes an expanded in-app glossary and this page extends the reference with linked educational context.

Peptide Glossary

All terms

A

Adherence
How consistently a person follows a prescribed or planned medication schedule (including titration and ongoing weekly injections).
Opens: /glossary/adherence
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How consistently a person follows a prescribed or planned medication schedule (including titration and ongoing weekly injections). In obesity pharmacotherapy trials, continued adherence is strongly linked to maintaining weight-loss outcomes.
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Amino Acid
Organic compounds that serve as the building blocks of peptides and proteins. There are 20 standard amino acids that combine to form different peptide chains.
Opens: /glossary/amino-acid
Related: /blog/what-are-peptides-complete-beginners-guide
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Organic compounds that serve as the building blocks of peptides and proteins. There are 20 standard amino acids that combine to form different peptide chains.
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Aseptic Technique
The set of sterile-handling practices that keeps peptides and injection equipment free from contamination during reconstitution and dosing.
Opens: /glossary/aseptic-technique
Related: /blog/how-to-reconstitute-peptides-step-by-step
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The set of sterile-handling practices, including hand hygiene, disinfecting vial stoppers with alcohol, and using single-use needles and syringes, that keeps peptides and injection equipment free from contamination during reconstitution and dosing.
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B

Bacteriostatic Water
Sterile water containing 0.9% benzyl alcohol as a preservative. Used for reconstituting peptides because it prevents bacterial growth, allowing multi-dose vial use.
Opens: /glossary/bacteriostatic-water
Related: /blog/bacteriostatic-water-guide-peptides
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Sterile water containing 0.9% benzyl alcohol as a preservative. Used for reconstituting peptides because it prevents bacterial growth, allowing multi-dose vial use.
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Bioavailability
The proportion of a substance that enters circulation when introduced into the body and is able to have an active effect. Subcutaneous injection typically provides high bioavailability for peptides.
Opens: /glossary/bioavailability
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The proportion of a substance that enters circulation when introduced into the body and is able to have an active effect. Subcutaneous injection typically provides high bioavailability for peptides.
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BPC-157
Body Protection Compound-157, a pentadecapeptide (15 amino acids) derived from human gastric juice. Researched for its potential tissue healing and protective properties.
Opens: /glossary/bpc-157
Related: /blog/bpc-157-complete-guide-benefits-dosage
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Body Protection Compound-157, a pentadecapeptide (15 amino acids) derived from human gastric juice. Researched for its potential tissue healing and protective properties.
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C

CJC-1295
A synthetic analogue of growth hormone-releasing hormone (GHRH). Available with or without DAC (Drug Affinity Complex) which extends its half-life.
Opens: /glossary/cjc-1295
Related: /blog/cjc-1295-dac-vs-no-dac-explained
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A synthetic analogue of growth hormone-releasing hormone (GHRH). Available with or without DAC (Drug Affinity Complex) which extends its half-life.
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Co-Administration
Giving two or more peptides during the same session.
Opens: /glossary/co-administration
Related: /blog/peptide-stacking-combination-guide
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Giving two or more peptides during the same session. Co-administration usually means separate back-to-back injections; less commonly it means combining compounds in one syringe. Same-syringe mixing requires confirmed compatibility of diluent, pH, and post-mix stability, and when compatibility is unknown, separate injections are the safer default.
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Concentration
The amount of peptide per unit of liquid after reconstitution, usually expressed in mcg/mL.
Opens: /glossary/concentration
Related: /calculators/reconstitution
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The amount of peptide per unit of liquid after reconstitution, usually expressed in mcg/mL. Calculated as peptide amount divided by diluent volume, it determines how many syringe units equal a target dose.
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D

DAC (Drug Affinity Complex)
A modification added to certain peptides that significantly extends their half-life by binding to albumin in the bloodstream.
Opens: /glossary/dac-drug-affinity-complex
Related: /blog/cjc-1295-dac-vs-no-dac-explained
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A modification added to certain peptides that significantly extends their half-life by binding to albumin in the bloodstream.
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Desensitization
A reduction in receptor sensitivity that can occur with continuous use of certain peptides. Often addressed through cycling protocols.
Opens: /glossary/desensitization
Related: /blog/peptide-cycling-guide-when-to-take-breaks
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A reduction in receptor sensitivity that can occur with continuous use of certain peptides. Often addressed through cycling protocols.
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Diluent
The sterile liquid added to lyophilized peptide powder during reconstitution, most commonly bacteriostatic water. The diluent volume you choose sets the final concentration.
Opens: /glossary/diluent
Related: /tools/bac-vs-sterile-water
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The sterile liquid added to lyophilized peptide powder during reconstitution, most commonly bacteriostatic water. The diluent volume you choose sets the final concentration.
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E

Epithalon
A synthetic tetrapeptide (Ala-Glu-Asp-Gly) based on the pineal peptide epithalamin, studied for telomerase activation and melatonin regulation.
Opens: /glossary/epithalon
Related: /blog/epithalon-longevity-peptide-guide
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A synthetic tetrapeptide (Ala-Glu-Asp-Gly) based on the pineal peptide epithalamin, studied for telomerase activation and melatonin regulation. Typically reconstituted with bacteriostatic water and dosed in short 10 to 20 day cycles; no published same-syringe compatibility data exists for combining it with other peptides, so it is generally injected separately.
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Epithalon (Epitalon)
Synthetic tetrapeptide Ala-Glu-Asp-Gly (AEDG), also spelled Epitalon. Studied mainly in aging, pineal, and telomerase research contexts; human standardized clinical protocols remain limited.
Opens: /glossary/epithalon
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Synthetic tetrapeptide Ala-Glu-Asp-Gly (AEDG), also spelled Epitalon. Studied mainly in aging, pineal, and telomerase research contexts; human standardized clinical protocols remain limited.
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G

GH Secretagogue
Compounds that stimulate the pituitary gland to release growth hormone. Includes peptides like Ipamorelin, GHRP-2, GHRP-6, and Sermorelin.
Opens: /glossary/gh-secretagogue
Related: /blog/ipamorelin-growth-hormone-secretagogue-guide
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Compounds that stimulate the pituitary gland to release growth hormone. Includes peptides like Ipamorelin, GHRP-2, GHRP-6, and Sermorelin.
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GHK-Cu
Glycyl-L-histidyl-L-lysine copper complex, a copper-binding tripeptide studied for collagen synthesis, wound healing, and skin matrix remodeling.
Opens: /glossary/ghk-cu
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Glycyl-L-histidyl-L-lysine copper complex, a copper-binding tripeptide studied for collagen synthesis, wound healing, and skin matrix remodeling.
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GHRH (Growth Hormone-Releasing Hormone)
A hormone released by the hypothalamus that stimulates the pituitary gland to produce and release growth hormone. Synthetic analogues like Sermorelin mimic this hormone.
Opens: /glossary/ghrh-growth-hormone-releasing-hormone
Related: /blog/sermorelin-natural-growth-hormone-optimization
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A hormone released by the hypothalamus that stimulates the pituitary gland to produce and release growth hormone. Synthetic analogues like Sermorelin mimic this hormone.
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GHRP (Growth Hormone-Releasing Peptide)
A class of synthetic peptides that stimulate growth hormone release through the ghrelin receptor. Includes GHRP-2 and GHRP-6.
Opens: /glossary/ghrp-growth-hormone-releasing-peptide
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A class of synthetic peptides that stimulate growth hormone release through the ghrelin receptor. Includes GHRP-2 and GHRP-6.
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H

Half-Life
The time required for the concentration of a peptide in the body to decrease by half. Important for determining dosing frequency.
Opens: /glossary/half-life
Related: /tools/half-life
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The time required for the concentration of a peptide in the body to decrease by half. Important for determining dosing frequency. After about five half-lives, only a small fraction of the original dose typically remains.
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I

Ipamorelin
A selective growth hormone secretagogue that stimulates GH release with minimal effect on cortisol or prolactin. Popular for its clean side effect profile.
Opens: /glossary/ipamorelin
Related: /blog/ipamorelin-growth-hormone-secretagogue-guide
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A selective growth hormone secretagogue that stimulates GH release with minimal effect on cortisol or prolactin. Popular for its clean side effect profile.
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L

Lyophilization
The freeze-drying process used to preserve peptides. Lyophilized peptides appear as a powder or cake in the vial and require reconstitution before use.
Opens: /glossary/lyophilization
Related: /blog/how-to-reconstitute-peptides-step-by-step
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The freeze-drying process used to preserve peptides. Lyophilized peptides appear as a powder or cake in the vial and require reconstitution before use.
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M

Melanotan II
A synthetic analogue of alpha-melanocyte-stimulating hormone. Researched for its effects on skin pigmentation and other physiological processes.
Opens: /glossary/melanotan-ii
Related: /blog/melanotan-2-tanning-peptide-guide
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A synthetic analogue of alpha-melanocyte-stimulating hormone. Researched for its effects on skin pigmentation and other physiological processes.
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P

Peptide Bond
The chemical bond that links amino acids together in a peptide chain. Formed through a dehydration synthesis reaction between the carboxyl group of one amino acid and the amino group of another.
Opens: /glossary/peptide-bond
Related: /blog/what-are-peptides-complete-beginners-guide
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The chemical bond that links amino acids together in a peptide chain. Formed through a dehydration synthesis reaction between the carboxyl group of one amino acid and the amino group of another.
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Peptide Stacking
The practice of using multiple peptides simultaneously to achieve synergistic effects. Requires careful consideration of timing and compatibility.
Opens: /glossary/peptide-stacking
Related: /blog/peptide-stacking-combination-guide
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The practice of using multiple peptides simultaneously to achieve synergistic effects. Requires careful consideration of timing and compatibility.
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PT-141 (Bremelanotide)
A synthetic peptide that acts on melanocortin receptors. Researched for its effects on sexual function and libido enhancement.
Opens: /glossary/pt-141-bremelanotide
Related: /blog/pt-141-bremelanotide-libido-guide
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A synthetic peptide that acts on melanocortin receptors. Researched for its effects on sexual function and libido enhancement.
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R

Reconstitution
The process of adding bacteriostatic water to lyophilized (freeze-dried) peptide powder to create an injectable solution.
Opens: /glossary/reconstitution
Related: /blog/how-to-reconstitute-peptides-step-by-step
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The process of adding bacteriostatic water to lyophilized (freeze-dried) peptide powder to create an injectable solution.
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S

Semaglutide
A GLP-1 receptor agonist peptide used for weight management and blood sugar control. Available as both injectable and oral formulations.
Opens: /glossary/semaglutide
Related: /blog/semaglutide-weight-loss-peptide-guide
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A GLP-1 receptor agonist peptide used for weight management and blood sugar control. Available as both injectable and oral formulations.
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Sermorelin
A synthetic analogue of the first 29 amino acids of human GHRH. Used to stimulate natural growth hormone production.
Opens: /glossary/sermorelin
Related: /blog/sermorelin-natural-growth-hormone-optimization
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A synthetic analogue of the first 29 amino acids of human GHRH. Used to stimulate natural growth hormone production.
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Subcutaneous Injection
Injection into the fatty tissue layer beneath the skin. The most common administration method for peptides, typically in the abdomen, thigh, or deltoid area.
Opens: /glossary/subcutaneous-injection
Related: /blog/peptide-injection-sites-rotation-guide
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Injection into the fatty tissue layer beneath the skin. The most common administration method for peptides, typically in the abdomen, thigh, or deltoid area.
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T

TB-500 (Thymosin Beta-4)
A synthetic version of a naturally occurring peptide present in almost all human and animal cells. Researched for tissue repair and anti-inflammatory properties.
Opens: /glossary/tb-500-thymosin-beta-4
Related: /blog/tb-500-thymosin-beta-4-healing-guide
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A synthetic version of a naturally occurring peptide present in almost all human and animal cells. Researched for tissue repair and anti-inflammatory properties.
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Tesamorelin
A synthetic form of growth hormone-releasing hormone approved for reducing abdominal fat in certain conditions.
Opens: /glossary/tesamorelin
Related: /blog/tesamorelin-visceral-fat-peptide-guide
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A synthetic form of growth hormone-releasing hormone approved for reducing abdominal fat in certain conditions.
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Tirzepatide
A dual GIP and GLP-1 receptor agonist peptide. Represents a newer class of weight management peptides with enhanced efficacy.
Opens: /glossary/tirzepatide
Related: /blog/tirzepatide-dual-agonist-weight-loss
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A dual GIP and GLP-1 receptor agonist peptide. Represents a newer class of weight management peptides with enhanced efficacy.
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PeptideGlossary

A

Adherence

Amino Acid

Aseptic Technique

B

Bacteriostatic Water

Bioavailability

BPC-157

C

CJC-1295

Co-Administration

Concentration

D

DAC (Drug Affinity Complex)

Desensitization

Diluent

E

Epithalon

Epithalon (Epitalon)

G

GH Secretagogue

GHK-Cu

GHRH (Growth Hormone-Releasing Hormone)

GHRP (Growth Hormone-Releasing Peptide)

H

Half-Life

I

Ipamorelin

L

Lyophilization

M

Melanotan II

P

Peptide Bond

Peptide Stacking

PT-141 (Bremelanotide)

R

Reconstitution

S

Semaglutide

Sermorelin

Subcutaneous Injection

T

TB-500 (Thymosin Beta-4)

Tesamorelin

Tirzepatide

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