Guides
Peptide comparisons
Peptides come in pairs that get confused: a native form and a modified one, two agonists at one receptor, a full peptide and its active fragment. Each page here sets out what is actually different, molecule by molecule.
Compare the molecule
Sequence length, molecular weight, the receptor it was built for, and whatever modification changes its stability. Those four facts separate almost every pair. Claims about what a peptide does belong to the research literature, and these pages point there rather than repeat it.
The report settles it
Two peptides with different sequences have different masses, and the mass-spec line on a report reads that mass. If you are unsure which of two similar peptides is in a vial, the expected mass on its report is the answer. On a pepuro vial, that report is one scan away.
Common questions
What does N-acetyl amidate mean on a peptide?
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An acetyl group on one end and an amide on the other. Both caps protect the sequence from the enzymes that trim peptides from their ends. The sequence between them is unchanged, and the molecular weight is slightly higher.
Are CJC-1295 DAC and no-DAC the same?
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No. Both are modified GHRH(1-29), but the DAC version carries a drug affinity complex that binds albumin and extends its half-life from minutes to days in research models. They differ by about 280 g/mol.
Is a fragment the same as the full peptide?
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No. A fragment is a short piece of the full sequence, chosen because it carries one specific activity. TB-500 fragment 17-23 is seven residues of a 43-residue peptide.
Both sides of every comparison are in the catalog.
Browse every peptideGuides
- KLOW vs KPV: a four-peptide blend and a tripeptideKLOW contains KPV as one of its four peptides, so they are not alternatives. What separates an 80 mg blend vial from a 10 mg KPV vial, and how each is checked.
- BPC-157 vs GHK-Cu and KPV: three peptides comparedBPC-157 is a 15-residue peptide at 1419.53 g/mol. GHK-Cu and KPV are tripeptides near 400. How the three differ and which blends hold them together.
- CJC-1295 and ipamorelin vs tesamorelinCJC-1295 and ipamorelin is a two-peptide pair; tesamorelin is one GHRH analog. How they compare, where IGF-1 LR3 fits, and the masses that tell them apart.
- TB-500 vs KPV: two research peptides comparedTB-500 is a 4,963 g/mol thymosin beta-4 peptide, KPV a 353 g/mol tripeptide. How they differ, and how TB-500 and GHK-Cu end up in one vial.
- Ipamorelin vs sermorelin vs tesamorelinIpamorelin is a ghrelin agonist, sermorelin and tesamorelin are GHRH analogs. Masses, receptors, and how ipamorelin differs from HGH and MK-677.
- Bacteriostatic water vs saline for peptidesBacteriostatic water is sterile water with 0.9% benzyl alcohol. Saline is water with 0.9% salt. How they differ as peptide diluents, and which one to use.
- GHK-Cu vs AHK-Cu: two copper tripeptides comparedGHK-Cu and AHK-Cu are both copper tripeptides. How they differ in sequence, what the catalog lists for each, prices per vial, and where NAD+ fits.
- CJC-1295 and ipamorelin: why they are pairedA GHRH analog and a ghrelin agonist in one vial. Why the two are studied together, what each half does, and the molar concentrations once reconstituted.
- Mazdutide vs survodutide vs retatrutideThree peptides that add the glucagon receptor to GLP-1. Which receptors each one hits, who developed it, and how they sit next to semaglutide and tirzepatide.
- Tesamorelin and ipamorelin: why they are pairedA full-length GHRH analog and a selective ghrelin agonist in one vial. What each half does, how it compares to the CJC-1295 pairing, and molar concentrations.
- Cagrilintide vs Semaglutide: amylin analog vs GLP-1 analogPaired in research, not swapped. Cagrilintide acts at amylin and calcitonin receptors, semaglutide at GLP-1: different hormones, different masses.
- CJC-1295 DAC vs no-DACSame GHRH backbone, one extra chemical group. What the drug affinity complex does to half-life and mass, and how to tell the two apart on a report.
- GHK-Cu vs GHK basicThe same three amino acids, with and without the copper ion. What the copper adds to the mass, the colour and the chemistry.
- GHRP-2 vs GHRP-6 vs ipamorelinThree ghrelin receptor agonists that differ by one design goal: selectivity. Sequences, masses, and what separates a selective agonist from a broad one.
- Melanotan 1 vs melanotan 2 vs PT-141Three melanocortin peptides: one linear, one cyclic, and one derived from the cyclic form. Sequences, masses and receptor targets.
- Peptide blends vs single vialsA blend fixes the ratio and saves a vial. Single vials let you set the ratio and check each component's report. When each one makes sense.
- Semaglutide vs Retatrutide: one receptor or threeSemaglutide is a 31-residue GLP-1 analog. Retatrutide is a 39-residue triple agonist. 618 daltons and two receptors separate them.
- Semaglutide vs tirzepatide vs retatrutideThree incretin peptides, one, two and three receptors. How they differ by sequence, size and receptor target, and what tells them apart on a lab report.
- Semaglutide vs Tirzepatide: what is the difference?One receptor or two, 31 residues or 39, and a 700 dalton gap on the mass spec. How the two most-ordered GLP-1 research peptides differ, molecule by molecule.
- Semax vs selankTwo Russian heptapeptides from completely different parents. Sequences, masses, and why the acetylated amidated versions weigh more.
- Sermorelin vs CJC-1295 (no DAC): four substitutions apartBoth are GHRH(1-29). CJC-1295 no DAC changes four residues for stability and gains ten daltons. Why they get confused and how a report keeps them apart.
- Sermorelin vs tesamorelin vs CJC-1295Three GHRH analogs built on the same fragment, each stabilised a different way. Masses, modifications and what tells them apart.
- TB-500 vs TB-500 fragment 17-23A 43-residue peptide and the seven residues inside it that do the actin binding. Masses, and why the fragment weighs a seventh as much.
- Tirzepatide vs Retatrutide: dual agonist or triple?Both are 39 residues with a C20 fatty chain. Retatrutide adds the glucagon receptor and drops 82 daltons. What separates them on paper and on a lab report.
- BPC-157 vs TB-500: what's the difference?BPC-157 and TB-500 are distinct research peptides studied in tissue-repair models. How they differ in sequence, size and research use, and how to verify each.