Research Library
Peptide Research, Explained
Evergreen guides on purity, documentation, handling, and the compounds themselves — written as research and procurement education. For laboratory research use only.
Tirzepatide Pricing: What Drives the Cost of Research-Grade Material
A look at chain length, the fatty-diacid modification, verification costs and how to compare tirzepatide prices per milligram of documented peptide.
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Where to Buy PT-141 (Bremelanotide) for Research
A buyer's guide to sourcing PT-141 for laboratory research: purity and identity checks for a cyclic peptide, questions for suppliers, storage and concentration math.
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MOTS-c Purity Testing: HPLC & Mass-Spec Identity Verification
Sequence-specific guide to verifying a synthetic MOTS-c lot: methionine oxidation, charge states, chromatogram reading and certificate contents.
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Cagrilintide Purity Testing: HPLC, Mass Spec & CoA Guide
A practical guide to verifying cagrilintide lots: reversed-phase HPLC for a lipidated amylin analog, mass-spec identity at about 4409 Da, and what a credible CoA contains.
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IGF-1 LR3 Purity Testing: HPLC, Mass Spec & Folding
A methods-first guide to verifying IGF-1 LR3: what HPLC, SDS-PAGE and mass spectrometry each prove, why folding is the extra question for this protein, and what a useful COA contains.
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Semax Purity Testing: HPLC, Mass Spec & CoA Guide
How semax lots are verified: reversed-phase HPLC, mass spectrometry near 814 Da, methionine oxidation, proline-isomer quirks, and the documents a complete certificate contains.
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Selank Purity Testing: HPLC, Mass Spec & CoA Guide
How selank is verified in the lab: HPLC for purity, mass spectrometry to confirm the Pro-Gly-Pro extension, proline-related impurities and what a lot CoA should contain.
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PT-141 Purity Testing: HPLC and Mass Spec Identity Verification
A cyclic peptide one dalton from its parent needs more than a purity number. How HPLC, mass spectrometry and a good CoA verify PT-141.
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Melanotan-II: Purity Testing & Identity Verification
How HPLC and mass spectrometry verify melanotan-II, including cyclization state, oxidation and dimer impurities, and the documents a lot should carry.
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KPV Purity Testing: HPLC, Mass Spec & CoA Guide
A practical guide to verifying KPV lots: why a tripeptide is hard to chromatograph, what the ~342 Da mass check shows, and how to read a KPV certificate of analysis.
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KLOW Stack Purity Testing: Verifying Four Peptides in One Vial
Why a blend needs component-level testing, what each analytical method shows for GHK-Cu, KPV, BPC-157 and TB-500, and how to read a KLOW Stack certificate.
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GHK-KPV Purity Testing: HPLC, Mass Spec & Identity Verification
How HPLC and mass spectrometry verify GHK-KPV: reference masses, joined chain versus blend, chromatogram checks and what a certificate should contain.
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AOD-9604 Purity Testing: HPLC, Mass Spec & CoA Guide
A working guide to verifying an AOD-9604 lot: reversed-phase HPLC, mass spectrometry for fragment boundary and disulfide state, net peptide content, and the documents a complete CoA contains.
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Hexarelin Purity Testing: HPLC, Mass Spec & CoA Guide
How hexarelin is verified in the lab: reversed-phase HPLC, mass-spectrometric identity, the difference between purity and content, and what a lot-specific CoA should contain.
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Tesamorelin: Purity Testing & Identity Verification
How HPLC and mass spectrometry verify tesamorelin, why the N-terminal hexenoyl group is the key identity check, and what a lot certificate should contain.
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CJC-1295 (DAC): Purity Testing & Identity Verification
How HPLC and mass spectrometry verify CJC-1295 with DAC, why maleimide hydrolysis matters, and what a lot-specific certificate should show.
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CJC-1295 (No DAC) Purity Testing: HPLC, Mass Spec & CoA Guide
A practical guide to verifying a CJC-1295 (No DAC) lot: reading the HPLC trace, confirming the ~3,368 Da mass, and what a certificate should contain.
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Ipamorelin Purity Testing: HPLC, Mass Spec & CoA Guide
How ipamorelin lots are verified: reversed-phase HPLC, mass-spec identity near 712 Da, what the method cannot see, and the documents a complete certificate includes.
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Sermorelin Purity Testing: HPLC, Mass Spec and COA Guide
What HPLC and mass spectrometry each prove for sermorelin, which mass shifts signal oxidation or deamidation, and what a batch COA should contain.
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NAD+ Purity Testing: HPLC, Identity & Degradation Checks
NAD+ is a small polar dinucleotide, so its purity testing differs from peptides. This guide covers HPLC, mass identity, degradation products and CoA checks.
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CJC-1295 & Ipamorelin Purity Testing: How to Verify a Blend
A two-peptide blend needs more than one purity number. This guide covers per-component HPLC, mass-spec identity, molar ratio, COA contents and the limits of testing.
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GHK-Cu Purity Testing: Sequence, Copper Content and Coordination
GHK-Cu needs two kinds of testing: sequence purity for the tripeptide and copper content and coordination for the metal. Here is how each is measured and read.
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BPC-157 Purity Testing: HPLC, Mass Spec and COA Explained
A researcher's guide to verifying a BPC-157 lot: what HPLC and mass spectrometry each prove, which impurities each can miss, and what a batch COA should show.
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TB-500 Purity Testing: HPLC, Mass Spec & CoA Guide
A practical guide to verifying TB-500 lots: what the name refers to, how HPLC and mass spectrometry work together, and what a credible certificate of analysis shows.
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