The building blocks of peptides and proteins. There are 20 standard amino acids that combine in different sequences to form every peptide and protein in biology. The specific sequence determines the peptide’s structure and function.

A short chain of amino acids linked by peptide bonds. Generally defined as sequences of 2-50 amino acids, though the boundary between “peptide” and “protein” is not rigid. Peptides can function as hormones, signaling molecules, or structural components.

The chemical bond that links amino acids together in a chain. Formed through a condensation reaction between the amino group of one amino acid and the carboxyl group of another, releasing a molecule of water.

The specific order of amino acids in a peptide chain. The sequence determines the peptide’s three-dimensional structure, biological activity, and receptor binding properties. Even a single amino acid change can dramatically alter function.

A peptide in which the amino acid chain forms a ring structure rather than a linear chain. Cyclic peptides often have enhanced stability and bioavailability compared to their linear counterparts. PT-141 is an example of a cyclic peptide.

The process of removing water from a peptide solution by freezing it and then reducing pressure to allow the frozen water to sublimate directly into vapor. The result is a dry, stable powder that can be stored long-term and prepared when needed. Most research peptides are supplied in lyophilized form.

The process of dissolving a lyophilized peptide powder back into a liquid solution for use. Typically done by slowly adding bacteriostatic water along the wall of the vial rather than directly onto the powder to avoid damaging the peptide structure through excessive agitation.

Sterile water containing 0.9% benzyl alcohol as a preservative. Used for preparing lyophilized research compounds because the benzyl alcohol inhibits bacterial growth, allowing the prepared solution to be stored and used over multiple sessions rather than requiring single-use preparation.

Purified water that has been sterilized and contains no preservatives. Unlike bacteriostatic water, sterile water does not inhibit bacterial growth after opening, so prepared solutions must be used promptly. Used when benzyl alcohol sensitivity is a concern in research protocols.

A document issued by a testing laboratory that reports the results of quality testing performed on a specific batch of product. A proper COA includes the batch/lot number, test methods used, results obtained, and acceptance criteria. Batch-specific COAs verify the actual product you received, not a representative sample.

The gold standard analytical method for determining peptide purity. HPLC separates a sample’s components based on their chemical properties and measures the relative proportion of the target compound versus impurities. Research-grade peptides typically require 98% or higher purity by HPLC.

An analytical technique that identifies compounds by measuring the mass-to-charge ratio of their ions. In peptide quality control, mass spectrometry confirms that the peptide’s molecular weight matches the expected value, verifying its identity. Often used alongside HPLC for comprehensive quality assurance.

The percentage of the target peptide in a sample relative to all other components. Expressed as a percentage (e.g., 98.5% purity means 98.5% of the sample is the intended peptide and 1.5% is impurities). Higher purity reduces confounding variables in research.

Testing for the presence of bacterial endotoxins (lipopolysaccharides from gram-negative bacteria) that can contaminate peptide preparations. Endotoxin contamination can cause significant inflammatory responses and confound research results. The LAL (Limulus Amebocyte Lysate) assay is the standard testing method.

A unique identifier assigned to a specific production batch of peptide. Lot numbers enable traceability from manufacturing through testing to delivery. When reviewing a COA, the lot number should match the product you received to confirm the test results apply to your specific batch.

A molecule that binds to a receptor and activates it, producing a biological response. Many research peptides are receptor agonists. For example, Ipamorelin is a GHSR agonist (it activates the growth hormone secretagogue receptor).

The formation of new blood vessels from pre-existing vasculature. Several research peptides, including BPC-157 and TB-500, are studied for their effects on angiogenesis as part of tissue repair and wound-model research.

A compound that stimulates the secretion of growth hormone. Secretagogues can work through different receptor pathways. GHRH analogs (like CJC-1295) work through GHRH receptors, while ghrelin mimetics (like Ipamorelin) work through GHSR receptors.

The time required for the concentration of a compound to decrease by half in a biological system. Half-life affects exposure frequency in research protocols. Short half-life peptides (like Mod GRF 1-29 at ~30 minutes) produce pulsatile effects, while longer half-life compounds (like CJC-1295 DAC at ~6-8 days) produce sustained effects.

A family of peptide hormones and receptors (MC1R through MC5R) involved in diverse physiological processes including pigmentation, inflammation, energy homeostasis, and neuroendocrine signaling. PT-141 and Melanotan II are research compounds that target melanocortin receptors.

A peptide encoded by genes within the mitochondrial genome rather than the nuclear genome. MDPs represent a newly discovered class of signaling molecules that challenge the traditional view of mitochondria as purely energy-producing organelles. MOTS-C is a prominent example.