43 research terms defined — peptide science, analytical methods, key compounds, and regulatory language. Bookmark this page for quick reference.
An organic molecule containing an amino group (–NH₂) and a carboxyl group (–COOH). Twenty standard amino acids serve as the building blocks of peptides and proteins. The sequence of amino acids in a peptide determines its three-dimensional structure and biological activity.
A peptide hormone co-secreted with insulin from pancreatic beta cells. Amylin slows gastric emptying, suppresses glucagon, and promotes satiety. Cagrilintide is a long-acting amylin analog studied in combination with semaglutide (CagriSema) for metabolic research.
The physiological process of new blood vessel formation from pre-existing vessels. In peptide research, angiogenesis is a key mechanism studied in tissue repair models — particularly with BPC-157 (VEGF upregulation) and TB-500 (endothelial cell migration).
A neurotrophin protein that supports neuron survival, growth, and synaptic plasticity. Several nootropic peptides (semax, selank, dihexa) are studied for their ability to upregulate BDNF expression as a mechanism for cognitive enhancement in research models.
The fraction of an administered peptide dose that reaches systemic circulation unchanged. Different delivery routes (subcutaneous, intranasal, oral) produce different bioavailability profiles. Subcutaneous administration typically provides the highest bioavailability for peptides, while oral bioavailability is limited by gastric degradation.
The most abundant structural protein in the human body, forming connective tissue, skin, tendons, and bone. Collagen peptides (hydrolyzed collagen) are enzymatically broken fragments studied for bioavailability and fibroblast-stimulating properties in skin and joint research.
Originating from within the organism. Many research peptides are synthetic versions of endogenous peptides — BPC-157 is a fragment of a naturally occurring gastric protein, GHK-Cu is found in human plasma, and GLP-1 is produced by intestinal L-cells.
A hypothalamic peptide that stimulates growth hormone secretion from the anterior pituitary gland. Synthetic GHRH analogs (CJC-1295, sermorelin) are studied for their pulsatile GH-releasing properties in endocrine research models.
A class of synthetic peptides that stimulate growth hormone release by activating the ghrelin/growth hormone secretagogue receptor (GHSR). Ipamorelin is the most selective GHRP, sparing cortisol and prolactin. GHRPs are often studied in combination with GHRH analogs.
An incretin hormone produced by intestinal L-cells that stimulates insulin secretion, inhibits glucagon release, and slows gastric emptying. GLP-1 receptor agonists (semaglutide, tirzepatide) are among the most-studied peptide-based compounds for metabolic research.
A 191–amino acid protein hormone produced by the anterior pituitary gland. GH regulates growth, body composition, and metabolism through direct and IGF-1–mediated pathways. Research peptides like CJC-1295, ipamorelin, and sermorelin stimulate endogenous GH release.
The time required for the concentration of a peptide in biological systems to decrease by 50%. Peptide half-lives range from minutes (unmodified peptides) to days (modified analogs like semaglutide). Half-life determines administration frequency in research protocols.
A hormone structurally similar to insulin, produced primarily by the liver in response to growth hormone stimulation. IGF-1 mediates many of GH's growth-promoting effects on muscle, bone, and tissue. IGF-1 LR3 is a modified analog with extended half-life studied in research.
A class of gut hormones (GLP-1 and GIP) that enhance insulin secretion in response to oral nutrient intake. Incretin-based peptide research focuses on GLP-1 receptor agonists (semaglutide), dual GIP/GLP-1 agonists (tirzepatide), and triple agonists (retatrutide).
The sum of atomic weights of all atoms in a peptide molecule, expressed in Daltons (Da). Molecular weight is a primary identity confirmation tool on COAs — the observed MW from mass spectrometry should match the theoretical MW of the target peptide sequence.
A neurotrophic factor essential for the growth, maintenance, and survival of sympathetic and sensory neurons. Peptide research explores NGF upregulation through semax and related nootropic compounds as a mechanism for neuroprotection and cognitive support.
A compound studied for cognitive enhancement — including memory, focus, neuroprotection, or neuroplasticity. Nootropic peptides in research include semax (BDNF/NGF upregulation), selank (anxiolytic/BDNF), dihexa (HGF/Met synaptogenesis), and pinealon (pineal bioregulation).
A short chain of amino acids (typically 2–50) linked by peptide bonds. Peptides are smaller than proteins and serve as signaling molecules in biological systems — regulating hormones, immunity, tissue repair, and neurotransmission. The human body produces thousands of endogenous peptides.
A covalent chemical bond formed between the carboxyl group of one amino acid and the amino group of another through a dehydration (condensation) reaction. Peptide bonds are the backbone linkages that hold amino acid chains together in peptides and proteins.
The resistance of a peptide to degradation over time. Major degradation pathways include hydrolysis, oxidation, deamidation, and aggregation. Stability is maximized by lyophilization, cold storage (−20°C for powder, 2–8°C for solution), protection from light, and minimizing freeze-thaw cycles.
A large polypeptide chain (typically >50 amino acids) that folds into a specific three-dimensional structure. Proteins perform structural, enzymatic, transport, and signaling functions. Peptides are distinguished from proteins by their shorter length and generally simpler folding patterns.
A substance that stimulates secretion of another substance. Growth hormone secretagogues (GHS) are compounds that stimulate GH release from the pituitary — including GHRH analogs (CJC-1295, sermorelin) and ghrelin mimetics (ipamorelin, GHRP-6).
A family of NAD+-dependent deacetylase enzymes (SIRT1–7) involved in cellular metabolism, DNA repair, inflammation, and aging. NAD+ peptide research explores how boosting NAD+ levels activates sirtuin pathways implicated in longevity and metabolic regulation.
Repetitive DNA sequences (TTAGGG) at chromosome ends that shorten with each cell division. Telomere length is studied as a biomarker of biological aging. Epitalon is a research peptide studied for its effects on telomerase activation and telomere length in preclinical models.
A signaling protein that promotes angiogenesis — the formation of new blood vessels from existing vasculature. Several research peptides (BPC-157, TB-500, GHK-Cu) are studied for their effects on VEGF-mediated pathways in tissue repair models.
A 15–amino acid partial sequence of human gastric juice protein BPC. Research models explore its activity through VEGF-mediated angiogenesis, nitric oxide modulation, and GABAergic signaling. It is one of the most widely studied tissue-repair peptides in preclinical literature.
A naturally occurring copper-binding tripeptide (glycyl-L-histidyl-L-lysine) found in human plasma. Research explores its roles in collagen synthesis, matrix metalloproteinase modulation, anti-inflammatory signaling, and wound healing. GHK-Cu levels decline with age.
A class of synthetic compounds that selectively bind androgen receptors in muscle and bone tissue with reduced activity in other organs. SARMs are not peptides — they are small molecules with different mechanisms, regulatory classifications, and risk profiles than research peptides.
A GLP-1 receptor agonist with an extended half-life achieved through albumin binding and DPP-4 resistance. FDA-approved forms exist for type 2 diabetes (Ozempic) and chronic weight management (Wegovy). Research-use materials are distinct from prescription formulations.
A synthetic 43–amino acid fragment of thymosin beta-4, an actin-sequestering protein involved in cell migration and wound healing. Research models evaluate TB-500 for tissue remodeling, inflammatory modulation, and cardiac repair through actin polymerization regulation.
A dual GIP/GLP-1 receptor agonist studied in the SURMOUNT and SURPASS clinical trial programs. It activates both glucose-dependent insulinotropic polypeptide and glucagon-like peptide-1 receptors, producing differentiated metabolic outcomes compared to GLP-1–only agonists.
Sterile water containing 0.9% benzyl alcohol as a preservative that inhibits bacterial growth. It is the standard solvent for reconstituting lyophilized peptides in research settings because the preservative allows multi-use vials over days to weeks, unlike single-use sterile water.
A chemical modification that extends peptide half-life by enabling reversible binding to serum albumin. CJC-1295 with DAC has a half-life of approximately 6–8 days, versus minutes for unmodified GHRH. This distinction affects GH release profiles in research models.
An analytical technique that separates, identifies, and quantifies components in a peptide sample by pumping it through a pressurized column. HPLC purity percentage (e.g., 99%+) is the primary quality metric on Certificates of Analysis for research peptides.
A dehydration process that removes water from a frozen peptide solution under vacuum via sublimation. The resulting lyophilized powder is stable at low temperatures for months to years. Reconstitution with bacteriostatic water restores the peptide to solution before research use.
An analytical technique that measures the mass-to-charge ratio of ions to confirm peptide identity. On a COA, the observed molecular weight from mass spectrometry should match the expected molecular weight of the target peptide within instrument tolerance (typically ±1 Da).
The percentage of target peptide in a sample, measured by HPLC. Research-grade peptides typically specify ≥95% purity, while high-quality suppliers achieve 99%+. Impurities may include truncated sequences, deletion sequences, or residual solvents from synthesis.
The process of dissolving a lyophilized (freeze-dried) peptide powder in a sterile solvent — typically bacteriostatic water — to create a solution suitable for research use. Proper reconstitution technique involves gentle swirling (never shaking) and directing the solvent down the vial wall to avoid damaging the peptide.
A Nobel Prize-winning technique for manufacturing synthetic peptides by building amino acid chains one residue at a time on a solid resin support. After synthesis, peptides are cleaved from the resin, purified via HPLC, and lyophilized. SPPS enables precise control over sequence and purity.
A route of administration where a substance is delivered into the layer of tissue between the skin and muscle (the subcutis). In peptide research, subcutaneous administration is the most common delivery route, typically using insulin syringes at sites with adequate subcutaneous tissue.
A document from an independent third-party laboratory that reports the identity, purity, and quality specifications of a specific peptide batch. A proper COA includes HPLC purity data, mass spectrometry identity confirmation, batch number, and testing date. COA-verified peptides are accompanied by this documentation.
The United States federal agency responsible for regulating drugs, biological products, and food safety. Research peptides sold as RUO are not FDA-approved drugs. Distinct regulatory pathways exist for FDA-approved peptide pharmaceuticals (e.g., semaglutide as Ozempic/Wegovy).
A regulatory designation indicating that a product is sold exclusively for laboratory, analytical, and research purposes — not for human or veterinary therapeutic use. RUO products are not FDA-approved drugs and cannot be marketed with therapeutic claims.
Ready to source?
Use code SOL at Live Alpha Labs for 10% off COA-verified research peptides.