Understand Research Peptides
Clear, research-calibrated guides to what peptides are, how their quality is verified, and how to handle them. Everything here is for laboratory research context, not medical guidance.
What Are Research Peptides? A Complete Guide
Research peptides are short chains of amino acids (typically 2 to 50 residues) synthesized for use in controlled laboratory and preclinical research. They are supplied as lyophilized (freeze-dried) powder, reconstituted before study, and are intended strictly for in-vitro research use, not for human or veterinary consumption. Quality is defined by verified purity, confirmed molecular identity, and a batch-specific Certificate of Analysis from an independent laboratory.
Read the guideFundamentals
What Are Research Peptides? A Complete Guide
Research peptides are short chains of amino acids (typically 2 to 50 residues) synthesized for use in controlled laboratory and preclinical research. They are supplied as lyophilized (freeze-dried) powder, reconstituted before study, and are intended strictly for in-vitro research use, not for human or veterinary consumption. Quality is defined by verified purity, confirmed molecular identity, and a batch-specific Certificate of Analysis from an independent laboratory.
Read guidePeptide Purity Explained: What 99% Actually Means
Peptide purity is the percentage of a sample that is the intended peptide rather than impurities such as truncated or deletion sequences and residual reagents, measured by HPLC. A stated purity of 99% means that, by HPLC peak area, 99% of the material is the target peptide. Higher and more consistent purity reduces confounding variables and improves the reproducibility of research results.
Read guideHow Research Peptides Are Tested: HPLC and Mass Spec
Research peptides are characterized mainly by two independent analytical methods: high-performance liquid chromatography (HPLC), which measures how pure the sample is, and mass spectrometry (MS), which confirms that the molecule is the intended one by measuring its mass. A complete testing report pairs these with physical checks such as appearance and, for many peptides, water and counterion content. Together they establish that a specific production lot is both the right compound and free of significant impurities, which is the whole point of characterized research material.
Read guideBuying Guide
How to Read a Peptide Certificate of Analysis (COA)
A peptide Certificate of Analysis (COA) is an independent laboratory report that documents, for one specific production lot, the peptide's measured purity (by HPLC), its confirmed molecular identity (by mass spectrometry), and its physical characteristics. To read one, match the lot number to your vial, confirm the HPLC purity meets the stated threshold, verify the mass-spec observed mass matches the theoretical mass, and check that the overall result reads PASS.
Read guideHow to Choose a Research Peptide Supplier
Choose a research peptide supplier by verifying seven things: independent third-party testing, Certificates of Analysis matched to your exact lot number, a clearly stated purity threshold, molecular-identity confirmation by mass spectrometry, transparent manufacturing and sourcing, proper research-use-only positioning with no human-use claims, and responsive documentation-first support. Any supplier that markets peptides for human consumption or hides its test data should be avoided.
Read guideResearch Peptide Compliance and Labeling Explained
Research-use-only (RUO) labeling signals that a product is intended strictly for in-vitro laboratory research and development and is not a drug, food, or cosmetic for human or veterinary use. Compliant suppliers carry that framing consistently across labels, product pages, and documentation, and they avoid any human-use, dosing, or therapeutic claims. Buyers are responsible for understanding and following the rules that apply to research materials in their own jurisdiction. This article is general information about how labeling and compliance are framed, not legal advice.
Read guideFirst-Time Research Peptide Buyer Guide and Checklist
For a first research peptide purchase, work through a short checklist before ordering: confirm the supplier provides a third-party Certificate of Analysis matched to the exact lot you receive, check that the stated purity threshold is measured by HPLC, verify identity is confirmed by mass spectrometry, and read the handling and storage documentation. Treat human-use or dosing claims, missing or generic Certificates of Analysis, and reports that are not matched to a lot as red flags. Everything on this site is supplied for laboratory research use only.
Read guideCompound Guide
Tesamorelin: Research Overview and Mechanism
Tesamorelin is a synthetic analog of growth hormone-releasing hormone (GHRH) studied in laboratory and preclinical research for its effects on the somatotropic axis, growth hormone secretion dynamics, and lipid metabolism. It is supplied as lyophilized powder for laboratory research only and is not for human use in this form. This overview describes how the GHRH analog is characterized in the research literature, including its public regulatory record as Egrifta, and not a therapeutic effect of the material sold here.
Read guideGLP-3RT: Research Overview and Mechanism
GLP-3RT is a research peptide studied as a triple agonist of the GIP, GLP-1, and glucagon receptors. In laboratory and preclinical research it is investigated within energy metabolism, glucose homeostasis, and adiposity endpoints. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideBPC-157 and TB-500: Tissue-Repair Research Overview
BPC-157 and TB-500 are peptides studied in laboratory and preclinical research for their roles in angiogenesis, cell migration, and tissue-repair pathways. GHK-Cu, a copper-binding peptide, is studied for extracellular-matrix remodeling. These three appear together in tissue-repair research blends such as GLOW-70. All are for research use only and are not approved for human use.
Read guideTirzepatide: Research Overview and Mechanism
Tirzepatide is a synthetic 39-residue peptide studied as a dual agonist of the GIP and GLP-1 receptors. In laboratory and preclinical research it is used to investigate incretin signaling, insulin-secretion dynamics, and energy-homeostasis endpoints. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideGHK-Cu: Copper Peptide Research Overview
GHK-Cu (copper tripeptide-1) is a copper-binding tripeptide studied within extracellular-matrix remodeling, collagen, and skin-research models. Its copper coordination gives reconstituted solutions a characteristic blue color. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideSurvodutide: Research Overview and Mechanism
Survodutide is an acylated synthetic peptide studied as a dual agonist of the glucagon and GLP-1 receptors. In laboratory and preclinical research it is investigated within incretin signaling, glucagon-receptor activity, and energy-homeostasis endpoints. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideCagrilintide: Research Overview and Mechanism
Cagrilintide is a long-acting, acylated amylin analog studied for its interactions with the amylin and calcitonin receptor families. In laboratory and preclinical research it is investigated within satiety signaling and energy-homeostasis models, often alongside incretin peptides. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideMOTS-C: Research Overview and Mechanism
MOTS-c is a 16-residue mitochondrial-derived peptide studied in laboratory and preclinical research for its association with AMPK signaling and metabolic homeostasis. Encoded within the mitochondrial 12S rRNA region, it is used as a tool compound in cellular-metabolism and mitochondrial-biology research. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guide5-Amino-1MQ: Research Overview and Mechanism
5-Amino-1MQ is a small-molecule inhibitor of the enzyme nicotinamide N-methyltransferase (NNMT), studied in laboratory and preclinical research for its association with NAD+ and nicotinamide metabolism. It is a non-peptide tool compound used in cellular-metabolism and adipocyte-biology research. It is supplied as a powder for research use only and is not approved for human use.
Read guideCJC-1295: Research Overview and Mechanism
CJC-1295 is a modified GRF(1-29) analog of growth hormone-releasing hormone (GHRH) studied in laboratory and preclinical research within the somatotropic axis. It is offered in a no-DAC (Modified GRF 1-29) variant and a longer-acting DAC variant that binds serum albumin to extend research half-life. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideIpamorelin: Research Overview and Mechanism
Ipamorelin is a selective synthetic pentapeptide agonist of the growth hormone secretagogue receptor (GHS-R1a) studied in laboratory and preclinical research for growth hormone-secretion dynamics and somatotroph signaling. It is noted in research literature for its selectivity relative to earlier secretagogues, which makes it a useful tool compound for isolating GHS-R signaling. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideSermorelin: Research Overview and Mechanism
Sermorelin is GRF(1-29), the shortest fully active N-terminal fragment of growth hormone-releasing hormone, studied in laboratory and preclinical research as a GHRH-receptor agonist within somatotroph signaling and growth hormone-secretion models. It is supplied as a lyophilized powder for research use only and is not approved for human use. Its former U.S. regulatory history as the molecule once marketed as Geref is noted here as public fact about the compound, not a therapeutic property of this research material.
Read guideHexarelin: Research Overview and Mechanism
Hexarelin (examorelin) is a synthetic hexapeptide agonist of the growth hormone secretagogue receptor studied in laboratory and preclinical research for growth hormone-secretion signaling and for its noted interaction with the CD36 receptor. It is supplied as a lyophilized powder for research use only and is not approved for human use. Its dual engagement of GHS-R and the CD36 scavenger receptor is described here as reported laboratory pharmacology of the molecule, not a therapeutic effect.
Read guideGHRP-2: Research Overview and Mechanism
GHRP-2 (pralmorelin) is a synthetic hexapeptide agonist of the growth hormone secretagogue receptor studied in laboratory and preclinical research within ghrelin signaling and growth hormone-secretion models. It is a frequently referenced secretagogue tool compound in somatotroph pharmacology. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideGHRP-6: Research Overview and Mechanism
GHRP-6 is a first-generation synthetic hexapeptide agonist of the growth hormone secretagogue receptor studied in laboratory and preclinical research within ghrelin signaling and growth hormone-secretion models. It is one of the original secretagogue tool compounds in somatotroph pharmacology. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideMK-677: Research Overview and Mechanism
MK-677 (Ibutamoren) is a non-peptide small molecule studied in laboratory and preclinical research as an orally active agonist of the growth hormone secretagogue receptor within GH/IGF-1 axis models. Unlike the peptide secretagogues, it is a small molecule rather than a lyophilized peptide. It is for research use only and is not approved for human use.
Read guideHGH Fragment 176-191: Research Overview and Mechanism
HGH Fragment 176-191 is a 16-residue C-terminal fragment of human growth hormone, studied in laboratory and preclinical research within lipolysis and GH structure-activity models. It retains the native cysteine-cysteine disulfide bridge and differs from AOD-9604 only by its N-terminal residue. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideAOD-9604: Research Overview and Mechanism
AOD-9604 is a modified analog of the human growth hormone 176-191 fragment carrying a tyrosine substituted for its N-terminal phenylalanine, studied in laboratory and preclinical research within lipolysis and adipose-metabolism models. It retains the native disulfide bridge and is a frequently referenced GH-fragment tool compound. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideBPC-157: Research Overview and Mechanism
BPC-157 is a synthetic pentadecapeptide derived from a partial sequence of a gastric protein, studied in laboratory and preclinical research within angiogenesis, cytoprotection, and tissue-repair pathways. It is one of the most frequently referenced tool compounds in tissue-repair research literature. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideWolverine: Research Overview and Mechanism
Wolverine is a two-component research blend combining BPC-157 and TB-500 in a single vial, studied across complementary tissue-repair pathways in laboratory and preclinical models. BPC-157 is studied for angiogenesis and cytoprotection, and TB-500, a thymosin beta-4 fragment, is studied for cell migration and actin regulation. As a multi-component blend it has no single molecular formula; component ratios are documented on the lot-matched Certificate of Analysis. It is for research use only and is not approved for human use.
Read guideKPV: Research Overview and Mechanism
KPV is the C-terminal tripeptide (lysine-proline-valine) of alpha-MSH, studied in laboratory and preclinical research within inflammation-pathway (NF-kB) and epithelial-barrier models. It is used as a compact peptide tool in melanocortin-related and inflammation research. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideGLOW-70: Research Overview and Mechanism
GLOW-70 is a three-component research blend combining GHK-Cu, BPC-157, and TB-500 in a single vial, studied across tissue-repair, extracellular-matrix remodeling, and cellular-regeneration pathways in laboratory and preclinical models. It reconstitutes to a characteristic blue solution from the copper-peptide component. As a multi-component blend it has no single molecular formula; component ratios are documented on the lot-matched Certificate of Analysis. It is for research use only and is not approved for human use.
Read guideEpithalon: Research Overview and Mechanism
Epithalon (epitalon) is a synthetic tetrapeptide with the sequence Ala-Glu-Asp-Gly (AEDG), studied in laboratory and preclinical research within telomere biology, circadian and pineal regulation, and cellular-senescence models. It is a compact analog of the pineal peptide epithalamin, supplied as a lyophilized powder for research use only and is not approved for human use. This overview reports how the tetrapeptide is characterized in the research record, not a therapeutic outcome for any individual.
Read guideNAD+: Research Overview and Mechanism
NAD+ (nicotinamide adenine dinucleotide) is a dinucleotide coenzyme, not a peptide, studied in laboratory and preclinical research within cellular metabolism, redox biology, mitochondrial function, and sirtuin enzymology. It is used as a reference compound in energy-metabolism and DNA-repair research models. It is supplied for research use only and is not approved for human use, and this overview describes what it is studied for in research literature, not a therapeutic effect.
Read guideSS-31: Research Overview and Mechanism
SS-31 (elamipretide) is a mitochondria-targeted synthetic tetrapeptide studied in laboratory and preclinical research for its association with cardiolipin binding and mitochondrial bioenergetics. Under its development name elamipretide, the same molecule was evaluated in the Phase 3 MMPOWER-3 trial in primary mitochondrial myopathy and the TAZPOWER trial in Barth syndrome, and in September 2025 elamipretide HCl received FDA accelerated approval for Barth syndrome under the brand name FORZINITY, described as the first mitochondria-targeted therapeutic approved in the United States. That regulatory record is stated here as public fact; the material supplied is a lyophilized powder for research use only, not the approved drug product, and this overview describes what the molecule is studied for in research literature, not a therapeutic effect.
Read guideFOXO4-DRI: Research Overview and Mechanism
FOXO4-DRI is a D-retro-inverso interfering peptide studied in laboratory and preclinical research within cellular-senescence and senolytics models, where it is investigated for disrupting the FOXO4-p53 protein interaction. Because its exact construct varies by supplier, its sequence and molecular weight should be reconciled against the Certificate of Analysis. It is supplied as a lyophilized powder for research use only and is not approved for human use, and this overview describes what it is studied for in research literature, not a therapeutic effect.
Read guideSemax: Research Overview and Mechanism
Semax is a synthetic heptapeptide analog of an ACTH(4-10) fragment, studied in laboratory and preclinical research within neurotrophic signaling, including BDNF, and neuroprotection models. It is registered as a pharmaceutical in Russia, where it has been used clinically and studied in human research, a regulatory status stated here as public fact. It is supplied as a lyophilized powder for research use only, and this overview describes what it is studied for in research literature, not a therapeutic effect.
Read guideSelank: Research Overview and Mechanism
Selank is a synthetic heptapeptide studied in laboratory and preclinical research within neuropeptide signaling, GABAergic and monoaminergic pathways, and tuftsin-related immunomodulation. Its N-terminal segment corresponds to the immunopeptide tuftsin, extended with a proline-glycine-proline sequence that resists enzymatic degradation. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideP21: Research Overview and Mechanism
P21 (also written P021) is an adamantylated peptidomimetic derived from an active region of ciliary neurotrophic factor (CNTF), studied in laboratory and preclinical research within neurotrophic signaling, BDNF induction, neurogenesis, and synaptic-plasticity models. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideThymosin Alpha-1: Research Overview and Mechanism
Thymosin Alpha-1 is a 28-amino-acid, N-terminally acetylated thymic peptide studied in laboratory and preclinical research within immune signaling, Toll-like-receptor pathways, and T-cell and dendritic-cell modulation. It is a well-characterized single molecule, distinct from the heterogeneous Thymalin extract. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideThymalin: Research Overview and Mechanism
Thymalin is a thymus-derived polypeptide fraction (an extract), not a single defined molecule, studied in laboratory and preclinical research within immune-signaling and thymic-peptide models. Because it is a heterogeneous mixture, it has no single molecular formula, weight, or sequence. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideLL-37: Research Overview and Mechanism
LL-37 is the human cathelicidin antimicrobial peptide, a 37-residue amphipathic helix studied in laboratory and preclinical research within innate immunity, host defense, membrane biophysics, and receptor-mediated immunomodulation. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideArgireline: Research Overview and Mechanism
Argireline (Acetyl Hexapeptide-8) is an N-acetylated, C-amidated hexapeptide studied in laboratory research within SNARE-complex assembly, SNAP-25-mimetic behavior, and dermal-fibroblast models. It is one of the most referenced cosmetic peptides in skin-research literature. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideSNAP-8: Research Overview and Mechanism
SNAP-8 (Acetyl Octapeptide-3) is a synthetic cosmetic octapeptide studied in laboratory research as a mimic of the N-terminal domain of SNAP-25, a SNARE-complex protein, within neuromuscular-signaling and dermal-fibroblast models. It is a C-terminal-extended analog of Argireline, adding an alanine and an aspartate to the parent hexapeptide sequence. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guidePT-141: Research Overview and Mechanism
PT-141 (bremelanotide) is a cyclic melanocortin heptapeptide studied in laboratory research within melanocortin-receptor pharmacology, with reported agonist activity at melanocortin receptors including MC4R and MC1R, and within broader GPCR signaling models. It is the free-acid analog of Melanotan II, differing only at the C-terminus. As a molecule, bremelanotide is an approved drug marketed as Vyleesi for hypoactive sexual desire disorder, stated here as regulatory context only. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideMT-2 (Melanotan II): Research Overview and Mechanism
MT-2 (Melanotan II) is a cyclic, amidated alpha-MSH analog studied in laboratory research as a non-selective melanocortin-receptor agonist within melanogenesis and receptor-pharmacology models. It differs from PT-141 only at the C-terminus (amide versus free acid), a frequent structure-activity comparison, and it is the parent structure from which the melanocortin agonist bremelanotide was derived. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideMelanotan I: Research Overview and Mechanism
Melanotan I (afamelanotide) is a linear 13-residue analog of alpha-MSH studied in laboratory research as a potent melanocortin agonist whose MC1R activity is examined within melanogenesis and receptor-pharmacology models. Its linear backbone distinguishes it from the cyclic Melanotan II. As a molecule, afamelanotide is an approved drug marketed as Scenesse, stated here as regulatory context only. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideKisspeptin-10: Research Overview and Mechanism
Kisspeptin-10 is a C-terminally amidated decapeptide, the active KISS1R/GPR54 agonist fragment of the KISS1 gene product, studied in laboratory research within reproductive neuroendocrinology and the GnRH-axis signaling that sits at the apex of the hypothalamic-pituitary-gonadal axis. Kisspeptin-10 has also been investigated in published human clinical research on gonadotropin release within reproductive endocrinology. It is supplied as a lyophilized powder for research use only and is not approved for human use.
Read guideComparisons
Tirzepatide vs GLP-3RT: A Research Comparison
The core difference is receptor breadth: Tirzepatide is studied as a dual agonist of the GIP and GLP-1 receptors, while GLP-3RT is studied as a triple agonist that adds glucagon-receptor activity. Both are investigated within incretin signaling and energy-metabolism research models, and both are for research use only.
Read guideGHRP-2 vs GHRP-6: A Research Comparison
GHRP-2 and GHRP-6 are both synthetic hexapeptide agonists of the growth hormone secretagogue receptor (GHS-R1a), studied within ghrelin signaling and GH-secretion research. They share that receptor but differ in amino acid sequence and in the secretagogue-signaling profiles reported in research literature, which is why they are compared as distinct tool compounds rather than treated as interchangeable. Both are for research use only.
Read guideSemax vs Selank: A Research Comparison
Semax and Selank are both Russian-developed research heptapeptides studied in CNS models, but they descend from unrelated parent molecules and are studied for different pathways. Semax is an ACTH(4-10) analog studied for neurotrophic (BDNF) signaling, while Selank is a tuftsin analog studied for neuropeptide, GABAergic, and immunomodulatory pathways. Both are for research use only.
Read guideMelanotan I vs Melanotan II (MT-2): A Research Comparison
Melanotan I and Melanotan II are both synthetic analogs of alpha-MSH studied within melanogenesis and melanocortin-receptor research, differing mainly in structure. Melanotan I is a linear 13-residue analog, while Melanotan II (MT-2) is a shorter cyclic heptapeptide. They also differ sharply in regulatory status. Both are for research use only and are not approved for human use in this form.
Read guideCJC-1295 vs Ipamorelin: A Research Comparison
CJC-1295 and Ipamorelin are studied together in growth hormone-secretion research because they act on two different receptors that converge on the same axis. CJC-1295 is a GHRH-receptor analog that drives the somatotroph from the hypothalamic side, while Ipamorelin is a selective agonist of the ghrelin receptor (GHS-R1a). The canonical difference is receptor identity: GHRH receptor versus ghrelin receptor. Neither is an approved medicine; both are supplied for laboratory research use only.
Read guideSermorelin vs Tesamorelin: A Research Comparison
Sermorelin and Tesamorelin both act on the GHRH receptor, so the comparison turns on length, stability, and regulatory history rather than target. Sermorelin is GRF(1-29), the shortest fragment that retains full GHRH activity; Tesamorelin is a longer, stabilized 44-residue analog. Their histories diverge sharply: Tesamorelin is an approved drug while Sermorelin was previously marketed and later discontinued. Both are supplied here as research-use-only materials, distinct from any approved product.
Read guideMK-677 vs Ipamorelin: A Research Comparison
MK-677 and Ipamorelin both agonize the ghrelin receptor (GHS-R1a), so the comparison is about molecular class and route of activity, not target. MK-677 (Ibutamoren) is a non-peptide small molecule investigated as an orally active secretagogue; Ipamorelin is a selective peptide reconstituted from lyophilized powder for research. The canonical difference is small molecule versus peptide. Neither is an approved medicine, and both are supplied for research use only.
Read guideHGH Fragment 176-191 vs AOD-9604: A Research Comparison
HGH Fragment 176-191 and AOD-9604 are almost the same molecule: AOD-9604 is the 176-191 fragment with its N-terminal phenylalanine substituted by tyrosine. Both are studied within lipolysis and growth hormone structure-activity research. Their research trajectories differ, with AOD-9604 having been carried into human clinical study as a metabolic candidate while the unmodified fragment is chiefly a preclinical reference. Both are supplied for research use only.
Read guideBPC-157 vs GHK-Cu: A Research Comparison
BPC-157 and GHK-Cu are both studied in tissue-repair research but are different classes of molecule working through different pathways. BPC-157 is a synthetic pentadecapeptide studied for angiogenesis and cytoprotection, largely in preclinical models. GHK-Cu is a copper-binding tripeptide with a long history in skin and matrix-remodeling research and an established role as a cosmetic ingredient. The canonical difference is peptide class and mechanism. Both are supplied for research use only.
Read guideEpithalon vs NAD+: A Research Comparison
Epithalon and NAD+ are both studied in longevity research but belong to entirely different molecular classes. Epithalon is a synthetic tetrapeptide studied within telomere biology and cellular senescence, chiefly in preclinical and limited clinical literature. NAD+ is a dinucleotide coenzyme, not a peptide, central to redox metabolism and sirtuin enzymology, whose precursors have been studied in human clinical research. The canonical difference is peptide versus coenzyme. Both are supplied for research use only.
Read guideTirzepatide vs Survodutide: A Research Comparison
Tirzepatide and Survodutide are both dual receptor agonists studied in metabolic research, and both engage the GLP-1 receptor; the difference is the second receptor. Tirzepatide adds GIP-receptor activity, while Survodutide adds glucagon-receptor activity. Their regulatory status differs sharply: Tirzepatide is an approved drug while Survodutide is investigational. The canonical difference is GIP versus glucagon as the partner receptor. Both are supplied here as research-use-only materials distinct from any approved product.
Read guideCagrilintide vs Tirzepatide: A Research Comparison
Cagrilintide and Tirzepatide are both studied in metabolic research but act on different receptor families. Cagrilintide is a long-acting amylin analog studied within amylin and calcitonin-receptor signaling; Tirzepatide is a dual GIP/GLP-1 incretin-receptor agonist and an approved drug. Because amylin and incretin pathways are complementary, the two are sometimes studied together, including in combination research. The canonical difference is amylin versus incretin receptors. Both are supplied for research use only.
Read guideThymosin Alpha-1 vs Thymalin: A Research Comparison
Thymosin Alpha-1 and Thymalin are both studied within thymic-peptide and immune-signaling research, but they differ in composition. Thymosin Alpha-1 is a single, well-defined 28-residue peptide; Thymalin is a heterogeneous thymus-derived polypeptide extract with no single molecular formula. Their regulatory histories also differ, with Thymosin Alpha-1 marketed in several countries and Thymalin used in Russian clinical practice. The canonical difference is defined peptide versus extract. Both are supplied for research use only.
Read guideSS-31 vs MOTS-C: A Research Comparison
SS-31 and MOTS-C are both studied in mitochondrial research but relate to the mitochondrion in different ways. SS-31 is a synthetic mitochondria-targeted tetrapeptide studied for cardiolipin binding and bioenergetics; MOTS-C is a peptide encoded within the mitochondrial genome itself, studied as an AMPK-linked signaling molecule. SS-31 has been carried into human clinical study, while MOTS-C is chiefly preclinical. The canonical difference is membrane targeting versus mitochondrial origin. Both are supplied for research use only.
Read guideHandling
Peptide Reconstitution and Storage: A Laboratory Guide
Lyophilized research peptides are reconstituted by slowly adding a suitable solvent (commonly bacteriostatic water) down the side of the vial, then gently swirling rather than shaking until dissolved. Store the unreconstituted powder at -20°C protected from light; refrigerate the reconstituted solution and use it within the window indicated on the Certificate of Analysis. Correct handling preserves purity and experimental reproducibility.
Read guidePeptide Storage and Shelf Life: A Research Guide
In dry, lyophilized form a research peptide is at its most stable, and when it is kept sealed at -20°C away from light and moisture it holds its integrity for an extended period. Once reconstituted, the same peptide is in solution and far less stable, so it is refrigerated and used within a much shorter window. Shelf life is not a single fixed number: it depends on the compound, the storage temperature, and how many freeze-thaw cycles the material has seen, so always defer to the stability window stated on the lot's Certificate of Analysis.
Read guideWhat Is Bacteriostatic Water? A Research Peptide Guide
Bacteriostatic water is sterile water that contains a small amount of benzyl alcohol, an additive that inhibits the growth of bacteria so a vial can be accessed more than once without the contents supporting microbial growth. In laboratory research it is a common general-purpose diluent for reconstituting lyophilized peptides, precisely because a multi-use solution needs that protection. It is not universal, though: some peptides require a different solvent for full solubility, so the correct choice depends on the compound and the research protocol.
Read guideReady to source verified peptides?
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