What is a research peptide?
Research peptides are synthetic amino acid chains used exclusively in scientific research. These molecules, composed of 2 to 50 amino acids, enable researchers to study fundamental biological mechanisms and explore new potential therapeutic pathways.
Since their first laboratory synthesis by Bruce Merrifield in 1963 (work awarded the Nobel Prize in Chemistry in 1984), synthetic peptides have become indispensable tools of modern biomedical research. Their ability to mimic or modulate natural biological functions makes them prime candidates for studying complex molecular interactions.
Important: All our peptides are intended exclusively for scientific research (Research Use Only - RUO). They are not intended for human or animal consumption, nor for diagnostic or therapeutic use.
Molecular structure and peptide bond
Peptides differ from proteins by their size: a peptide generally contains fewer than 50 amino acids, while a protein contains more. This size difference gives peptides unique properties in terms of bioavailability and specificity of action.
The peptide bond is a covalent bond formed between the carboxyl group (-COOH) of one amino acid and the amine group (-NH₂) of the next, with the elimination of a water molecule. This bond gives peptides a characteristic planar structure that influences their three-dimensional conformation and, consequently, their biological activity [1].
Peptide classification
Peptides can be classified according to several criteria:
- Dipeptides: 2 amino acids (e.g., carnosine, anserine)
- Tripeptides: 3 amino acids (e.g., GHK-Cu, glutathione)
- Oligopeptides: 4 to 10 amino acids
- Polypeptides: 10 to 50 amino acids (e.g., BPC-157 with 15 AA)
Based on their biological function, peptides can also be categorized as signal peptides (hormones), antimicrobial peptides (defensins), neurotransmitter peptides (endorphins), and growth-regulating peptides (growth factors) [2].
Scientific applications of peptides
Research peptides find applications in many areas of biomedical research. Their specificity of action and ability to finely modulate cellular signaling pathways make them valuable tools for understanding fundamental biological mechanisms.
Cardiovascular research
Study of tissue regeneration mechanisms and cardiac protection. Exploration of signaling pathways involved in myocardial repair. Preclinical studies have demonstrated the role of peptides in modulating angiogenesis and protecting against ischemia-reperfusion injury [3].
Neuroscience
Investigation of neuroprotective factors and neuroplasticity mechanisms. Research on nootropic peptides and their effects on cognition, memory, and neuroregeneration processes. Peptides such as Semax and Selank are being studied for their interaction with the dopaminergic system [4].
Cell biology
Study of cell proliferation, apoptosis, and differentiation processes. Analysis of ligand-receptor interactions and intracellular signaling cascades. Peptides enable specific targeting of certain metabolic pathways without affecting others [5].
Dermatological research
Research on collagen synthesis, wound healing, and molecular-level skin aging processes. Copper peptides (GHK-Cu) are being studied for their ability to modulate gene expression of extracellular matrix proteins [6].
Molecular mechanisms of action
Research peptides exert their biological effects through several mechanisms:
- Membrane receptor binding: Many peptides act as ligands for G-protein-coupled receptors (GPCRs), triggering intracellular signaling cascades via cAMP or calcium [7].
- Gene expression modulation: Certain peptides such as GHK-Cu can influence the expression of over 4,000 human genes, affecting processes such as tissue repair and anti-inflammatory response [6].
- Enzymatic inhibition: Peptides can act as competitive inhibitors of specific enzymes, thereby modulating targeted metabolic pathways.
- Ion channel interaction: Some peptides alter membrane permeability by interacting with sodium, potassium, or calcium channels.
Key research peptides
Among the hundreds of available research peptides, some stand out due to the abundance of scientific literature and their interest to the research community. Here is a detailed analysis of the most studied peptides.
BPC-157 (Body Protection Compound)
RegenerationBPC-157 is a synthetic pentadecapeptide with the sequence Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val, derived from the BPC protein found in human gastric juice. Over 100 preclinical studies have explored its effects on tissue regeneration, particularly at the muscular, tendon, and gastrointestinal levels [8].
Mechanism studied: modulation of the NO system, interaction with growth factors (VEGF, EGF), and FAK-paxillin signaling pathways.
View BPC-157 productsGHK-Cu (Copper Peptide)
Cellular longevityGHK-Cu (Glycyl-L-Histidyl-L-Lysine-Copper) is a tripeptide naturally present in human blood plasma at concentrations of ~200 ng/mL in young adults, decreasing with age. Studies have identified over 4,000 genes whose expression is modulated by this peptide [6].
Mechanism studied: stimulation of collagen I and III synthesis, elastin, glycosaminoglycans, and modulation of matrix metalloproteinases (MMPs).
View GHK-Cu productsTB-500 (Thymosin Beta-4)
Wound healingTB-500 is a 43-amino-acid fragment of Thymosin Beta-4, a G-actin sequestering protein found in nearly all nucleated cells. This protein plays a central role in cell migration and cytoskeleton organization [9].
Mechanism studied: promotion of angiogenesis, actin regulation, recruitment of endothelial progenitor cells.
View TB-500 productsSemaglutide
MetabolismSemaglutide is a GLP-1 (Glucagon-Like Peptide-1) analogue modified for an extended half-life (~7 days vs. 2 minutes for native GLP-1). This modification includes an Ala8→Aib substitution and C18 acylation enabling albumin binding [10].
Mechanism studied: GLP-1R receptor activation, potentiation of glucose-dependent insulin secretion, delayed gastric emptying.
View Semaglutide productsIpamorelin
GrowthIpamorelin is a selective pentapeptide of the ghrelin receptor (GHS-R1a). Unlike other secretagogues, it exhibits high selectivity for GH release without significant effects on ACTH, cortisol, or prolactin [11].
Mechanism studied: selective GHSR agonism, pulsatile GH stimulation, without rapid receptor desensitization.
View Ipamorelin productsNAD+ (Nicotinamide Adenine Dinucleotide)
LongevityNAD+ is an essential coenzyme present in all living cells, involved in over 500 enzymatic reactions. Its decline with age is associated with numerous cellular aging processes [12].
Mechanism studied: sirtuin cofactor (SIRT1-7), mitochondrial energy metabolism regulation, DNA repair via PARPs.
View NAD+ productsEditorial hubs — incretins & GHRH analogs
Dive deeper into our four flagship molecules: mechanism, pivotal clinical trials, dose comparison, and 8 FAQs per hub.
Retatrutide
GLP-1 / GIP / GCGR · TRIUMPH 2024 · 6 doses
Read the hub Dual agonistTirzepatide
GLP-1 / GIP · SURMOUNT-1 · SURPASS-2 · 4 doses
Read the hub GLP-1 referenceSemaglutide
GLP-1 only · STEP-1 · SELECT 2023 · 3 doses
Read the hub GHRH analogTesamorelin
GHRH · Egrifta · LIPO-010 · MATCH · 2 formats
Read the hubAccess our complete catalog of premium research peptides:
Quality criteria
The quality of research peptides is critical for the reproducibility and reliability of experimental results. Here are the essential criteria to consider:
Verified by high-performance liquid chromatography. A research-grade peptide must have a minimum purity of 98%.
Molecular mass confirmation to ensure the identity of the synthesized peptide.
Document certifying the results of quality control tests performed on each production batch.
Optimal storage in lyophilized form at negative temperature to preserve stability.
Reconstitution guide
Proper reconstitution of lyophilized peptides is essential to preserve their molecular integrity and ensure reliable research results.
Preparation
Allow the vial to reach room temperature before opening to avoid condensation.
Solvent selection
Use bacteriostatic water or sterile 0.9% NaCl according to the peptide-specific recommendations.
Slow injection
Add the solvent along the wall of the vial, never directly onto the lyophilized powder.
Dissolution
Gently roll the vial between your palms. Never shake vigorously.
Frequently asked questions
What is the difference between a peptide and a protein?
The main difference lies in size: a peptide generally contains fewer than 50 amino acids, while a protein contains more. This difference gives peptides distinct properties in terms of bioavailability and ease of synthesis.
How should research peptides be stored?
Lyophilized peptides should be stored at -20°C, protected from light and moisture. Once reconstituted, they should be refrigerated at 2-8°C and used within the specified time frame (typically 14-30 days depending on the peptide).
What is HPLC purity?
HPLC purity (High-Performance Liquid Chromatography) indicates the percentage of the target peptide relative to impurities in the sample. A purity of ≥98% is the standard for research-grade peptides.
Why are peptides sold in lyophilized form?
Lyophilization (freeze-drying) removes water from the peptide, making it more stable for long-term storage. In this form, peptides can be preserved for several years without significant degradation.
Which solvent should be used for reconstitution?
The choice of solvent depends on the peptide: bacteriostatic water is suitable for most hydrophilic peptides, while some hydrophobic peptides require dilute acetic acid or DMSO. Always consult the specific recommendations.
Are research peptides intended for human consumption?
No. All our peptides are sold exclusively for scientific research (Research Use Only - RUO). They are not intended for human or animal consumption, nor for diagnostic or therapeutic use.
Scientific references
This guide is based on peer-reviewed scientific literature. All references are available on PubMed for further consultation.
- Pauling L, Corey RB. The structure of proteins: two hydrogen-bonded helical configurations of the polypeptide chain. Proc Natl Acad Sci USA. 1951;37(4):205-11. PubMed: 14816373
- Fosgerau K, Hoffmann T. Peptide therapeutics: current status and future directions. Drug Discov Today. 2015;20(1):122-8. PubMed: 25450771
- Lau JL, Dunn MK. Therapeutic peptides: Historical perspectives, current development trends, and future directions. Bioorg Med Chem. 2018;26(10):2700-2707. PubMed: 29454660
- Dolotov OV, et al. Semax, an analog of ACTH(4-10) with cognitive effects, regulates BDNF and trkB expression in the rat hippocampus. Brain Res. 2006;1117(1):54-60. PubMed: 16942760
- Craik DJ, et al. The future of peptide-based drugs. Chem Biol Drug Des. 2013;81(1):136-47. PubMed: 23253135
- Pickart L, Margolina A. Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data. Int J Mol Sci. 2018;19(7):1987. PubMed: 29986520
- Henninot A, Collins JC, Nuss JM. The Current State of Peptide Drug Discovery: Back to the Future? J Med Chem. 2018;61(4):1382-1414. PubMed: 28737935
- Sikiric P, et al. Brain-gut Axis and Pentadecapeptide BPC 157: Theoretical and Practical Implications. Curr Neuropharmacol. 2016;14(8):857-865. PubMed: 27306034
- Goldstein AL, et al. Thymosin β4: a multi-functional regenerative peptide. Basic properties and clinical applications. Expert Opin Biol Ther. 2012;12(1):37-51. PubMed: 22074294
- Knudsen LB, Lau J. The Discovery and Development of Liraglutide and Semaglutide. Front Endocrinol (Lausanne). 2019;10:155. PubMed: 31031702
- Raun K, et al. Ipamorelin, the first selective growth hormone secretagogue. Eur J Endocrinol. 1998;139(5):552-61. PubMed: 9849822
- Covarrubias AJ, et al. NAD+ metabolism and its roles in cellular processes during ageing. Nat Rev Mol Cell Biol. 2021;22(2):119-141. PubMed: 33353981