Peptide Research Glossary

A hormone co-secreted with insulin from pancreatic beta cells. Suppresses glucagon, slows gastric emptying, and promotes satiety. Amylin analogs like cagrilintide mimic this action for weight management.

A cellular energy sensor activated when ATP is low. Triggers fat oxidation and glucose uptake. AICAR and MOTS-C activate AMPK pathways, mimicking exercise-like metabolic effects.

Sterile water preserved with 0.9% benzyl alcohol to inhibit bacterial growth. The standard diluent for reconstituting research peptides. Allows a vial to remain in use for up to 28 days. See: Bacteriostatic Water Guide →

A protein that supports neuronal survival, growth, and synaptic plasticity. Peptides like Semax and P21 upregulate BDNF expression, contributing to their nootropic effects.

The fraction of a drug that reaches systemic circulation unchanged. Subcutaneous peptide injection typically yields 70–90% bioavailability. Oral peptide bioavailability is often near zero due to GI proteolysis.

A 15-amino-acid peptide sequence derived from a gastric protein. Widely researched for tissue healing, gut repair, and anti-inflammatory effects. See: BPC-157 Calculator →

The amount of dissolved peptide per unit volume of solution. Calculated as: Vial Strength ÷ Reconstitution Volume. The foundation of every ASCEND draw calculation.

A modified growth hormone releasing hormone (GHRH) analog. Available in two forms: No DAC (short-acting, ~30 min) and With DAC (long-acting, ~8 day half-life via drug affinity complex binding to albumin). See: CJC-1295 Calculator →

A reactive maleimide group added to CJC-1295 that covalently binds to circulating albumin in the bloodstream. Dramatically extends half-life from ~30 minutes to approximately 8 days, enabling once-weekly or twice-monthly dosing.

The graduation line to draw to on a 100-unit insulin syringe. Calculated as: Liquid Volume (mL) × 100. Example: 0.167 mL = draw to the 16.7 (roughly 17) line.

A dosing frequency of once every 48 hours. Common for peptides with intermediate half-lives (BPC-157, TB-500). The ASCEND Protocol Tracker automatically calculates EOD schedules from a start date.

A synthetic tetrapeptide (Ala-Glu-Asp-Gly) derived from the pineal gland bioregulator epithalamin. Studied for telomerase activation and anti-aging properties. See: Epithalon Calculator →

A naturally occurring copper complex (Gly-His-Lys-Cu²⁺) found in human plasma. Stimulates collagen and elastin synthesis, promotes wound healing. See: GHK-Cu Calculator →

A hypothalamic neuropeptide that stimulates the pituitary to release growth hormone. Sermorelin, CJC-1295, and Tesamorelin are synthetic GHRH analogs.

An incretin hormone released from intestinal L-cells that stimulates insulin secretion, suppresses glucagon, slows gastric emptying, and reduces appetite. The target receptor for Semaglutide, Liraglutide, and components of dual/triple agonists.

The time required for the plasma concentration of a substance to fall to half its initial value. Determines dosing frequency. Short half-life (minutes–hours): BPC-157, Ipamorelin. Long half-life (days–weeks): Semaglutide, CJC-1295 w/DAC.

An analytical technique used to separate, identify, and quantify components in a mixture. Used in batch testing to verify peptide purity (% by area). ASCEND's verification standard requires HPLC analysis from independent labs.

A peptide hormone produced primarily in the liver in response to growth hormone. Mediates most of the anabolic effects of GH including muscle protein synthesis and cellular growth. IGF-1 LR3 is a long-acting analog. See: IGF-1 LR3 Calculator →

On an insulin syringe: the graduation markings, where 100 IU = 1 mL (on a U-100 syringe). ASCEND displays draw values in IU for direct syringe reading. Not to be confused with IU as a pharmacological unit of biological activity (used for HCG).

The standard storage form for most research peptides. Water is removed by freezing then sublimation under vacuum, yielding a stable dry powder with extended shelf life. Requires reconstitution before use.

An analytical technique that measures the mass-to-charge ratio of ions to confirm molecular identity. Used alongside HPLC to verify that a peptide sample is the correct compound and not an impurity or substitution.

A peptide encoded in the mitochondrial genome that regulates metabolic homeostasis. Activates AMPK, improves insulin sensitivity, and enhances exercise capacity. See: MOTS-C Calculator →

A short chain of amino acids (typically 2–50) linked by peptide bonds. Peptides act as signaling molecules, hormones, and growth factors. Research peptides are synthetic versions of endogenous peptides or novel analogs.

The study of how a drug moves through the body: absorption, distribution, metabolism, and excretion (ADME). PK parameters like Cmax, Tmax, and half-life inform dosing intervals.

The process of dissolving a lyophilized peptide with a diluent (typically BAC water) to create an injectable solution. The volume used determines concentration. See: Methodology →

How a substance enters the body. Common routes for research peptides: subcutaneous (SQ/SC) injection into fat tissue, intramuscular (IM) injection, and intranasal spray. Route affects onset, bioavailability, and duration.

A compound that causes the secretion of another substance. Growth hormone secretagogues (GHS) stimulate the pituitary to release GH. Examples: Ipamorelin, GHRP-2, GHRP-6, Hexarelin.

A compound that selectively kills senescent (dysfunctional, non-dividing) cells that accumulate with age and contribute to inflammation. FOXO4-DRI is a senolytic peptide studied in aging research.

Injection into the tissue layer between skin and muscle. The most common route for peptide administration. Uses a short, fine needle (typically 28–31 gauge, 5/16–½ inch). ASCEND draw calculations are calibrated for 100-unit subcutaneous insulin syringes.

A synthetic fragment of Thymosin Beta-4 (Tβ4), an actin-regulating protein involved in cell migration, angiogenesis, and tissue repair. Researched for injury recovery and reduced inflammation. See: TB-500 Calculator →

A dual GIP and GLP-1 receptor agonist. FDA-approved as Mounjaro/Zepbound. Among the most studied peptides in the ASCEND database with the most extensive clinical trial dosing data. See: Tirzepatide Calculator →

The total mass of peptide contained in a vial, expressed in mg (or IU for HCG). One of the two inputs to the ASCEND concentration formula. Common sizes range from 1 mg (IGF-1 LR3) to 5000 IU (HCG).