Laboratory documentation, clearly explained
Technical resources for reviewing batch identifiers, analytical reports, certificates of analysis, and research-material records. These documents are limited to laboratory records and are not instructions for use in people or animals.
Documentation essentials
Use the report issued for the exact lot in hand. A document should be evaluated within the receiving laboratory's own validated procedures and acceptance criteria.
How to choose a research materials supplier
Six checks that separate a documented supplier from a reseller: lot-matched reports, named laboratories, and whether the report was published before the batch went on sale. Run them on any site.
Read the guide → Switching suppliersLooking for a Peptide Sciences alternative?
Seven checks to run on any new research supplier before you order, and how we answer each one.
Switching suppliersResearch supplier closures in 2026
A dated list of research supplier closures, each linked to its public source, and what to check in a new supplier.
Switching suppliersChemyo closed: choosing a new supplier
Five checks to run on any new research supplier before you order, and how we answer each one.
Switching suppliersEternal Peptides closed: what to check next
Five questions to answer about a new research supplier before your first order.
Switching suppliersChameleon Peptides closed: choosing a new supplier
What to check in any new research supplier, and how we answer each check.
Analytical reportsReading third-party test documentation
Review sample identity, lot matching, methods, dates, results, and laboratory attribution without treating a report as a universal guarantee.
Read the guide → Certificates of analysisA peptide COA, annotated
One real third-party report read top to bottom: sample block, purity method, identity method, net content, screens, and the footnotes most readers skip.
Read the guide → Certificates of analysisHow to read a certificate of analysis
What each section of an analytical report means, how to read a chromatographic purity result, and how to verify a certificate number with the issuing laboratory.
Read the guide → Lot traceabilityLot traceability: match a vial to its report
The three links between a vial and its lab report, what a lot code means, what a COA cannot prove, and what breaks the chain.
Read the guide → Storage and recordsStoring lyophilized research materials
What freeze-dried material in a sealed vial is sensitive to, the storage conditions commonly specified, and the receiving records that keep a stored lot traceable.
Read the guide → VerificationHow to verify a certificate of analysis
Find the certificate number, confirm it on the issuing laboratory's verification page, compare the fields, and record the check.
Read the guide → Analytical methodsHPLC vs mass spectrometry
What each test proves about a research peptide, what each misses, and how to read purity and identity lines together.
Read the guide → ReceivingReceiving inspection checklist
Package, seal and label checks, lot-to-record matching, and the seven-field receiving record.
Read the guide → GlossaryCertificate of analysis glossary
Lot, HPLC, peak area, retention time, mass spectrometry, certificate number and the other terms on a report, defined plainly.
Read the guide → Documentation processHow batch documentation is published
The chain from a production lot to a verifiable report: identification, independent analysis, library entry, verification.
Read the guide → TestingThird-party vs. in-house testing
How to tell which one a report is, and what each can and cannot support.
Read the guide → Analytical methodsWhat a purity percentage means on a certificate of analysis
How a figure such as 99.2% is calculated, what it leaves out, and how to compare results between lots.
Compound documentationBPC-157: peptide identity, purity, and stability
The 15-residue sequence, why its proline and aspartate chemistry shapes the impurity profile, and what a lot report should show.
Compound documentationGHK-Cu: copper peptide identity, purity, and reading two lots
Why the copper changes the analysis, and what comparing two lots across two laboratories does and does not tell you.
Compound documentationTB-500 and thymosin beta-4: what the name actually covers
One name, two molecules, a fivefold mass difference — and the one line on a report that tells them apart.
Compound documentationBPC-157 vs TB-500: what the analytical report shows
Fifteen residues against forty-three, no sulfur against one, two charge states against an envelope — how the two reports differ line by line, and which lots are documented.
Compound documentationCJC-1295 with and without DAC: two different materials
What the linker changes: mass, retention time, and an impurity that is itself a legitimate peptide.
Compound documentationMOTS-c: identity, purity, and why oxidation is its failure mode
A mitochondrially derived 16-mer whose first six residues tell you how it will degrade and where the peaks appear.
Compound documentationMelanotan II: cyclic identity and the 18-dalton question
Why the identity result on a cyclic peptide is really a structural check, and what an 18-unit discrepancy would mean.
Compound documentationIpamorelin: unnatural residues and why the mass looks wrong
Aib, D-residues and an amide cap — why your own mass calculation disagrees with the certificate, and which error only the chromatogram can catch.
Compound documentationSemax: identity, purity, and the proline tail that defines it
Why the appended tail is the point, and why the identity result should describe seven residues rather than four.
Compound documentationNAD+ is not a peptide, and its COA looks different
Why a dinucleotide needs different documentation, and why water content is the line that matters most.
Compound documentationMelanotan I: linear versus cyclic, and why it matters
One numeral apart, roughly 620 mass units apart, and a completely different impurity profile.
Compound documentationIGF-1 LR3 is a protein, not a peptide
83 residues, three disulfide bonds, and the reason a perfect purity figure cannot tell you it folded correctly.
Compound documentationTesamorelin: a 44-residue chain and the group on its end
Why chain length sets the impurity profile, and why the missing acyl group is the failure to rule out.
Compound documentationSermorelin and modified GRF: the parent and its analogues
Three closely spaced 29-residue molecules, and why the formula matters more than the rounded mass.
Compound documentationSelank and Semax: the same tail on two different peptides
Shared design, opposite failure modes — and you can tell which is which from the first residue.
Compound documentationEpitalon: four residues and the limits of a short synthesis
Why a 99% figure on a tetrapeptide tells you much less than the same figure on a 44-residue chain.
Compound documentationThe GHRP family: GHRP-2, GHRP-6 and Hexarelin side by side
Three compounds separated by a methyl group and a substitution — and why a rounded mass is not identification.
Compound documentationThymosin alpha-1: an acetylated N-terminus and what it hides
A 42-unit cap, and the third example of a compound whose characteristic impurity is a legitimate peptide.
Compound documentationPT-141: a second cyclic melanocortin analogue
The same ring and the same 18-unit check as Melanotan II, and why the formula beats the rounded mass here.
Compound documentationAOD-9604: a fragment with an added residue
One added tyrosine, one disulfide bond, and two different mass checks a report should satisfy.
Compound documentationDSIP: a nonapeptide with an unusually simple report
No ring, no cap, no oxidisable residue — the clearest example of what a plain certificate should still contain.
Compound documentationKisspeptin-10: a C-terminal amide and a very basic chain
Why a tailing peak makes a high purity figure less trustworthy, and what the amide cap has to prove.
Compound documentationSS-31: alternating aromatic and basic residues
Dimethyltyrosine, a D-arginine, and two reasons your own mass calculation will disagree with the certificate.
Compound documentationWhat a blend COA has to show
One purity figure cannot describe three compounds — what a multi-component report needs instead.
Compound documentationNet peptide content: why the label weight is not the peptide weight
A vial can be 99% pure and 70% peptide at the same time. Both numbers are honest, and they answer different questions.
Compound documentationArgireline: a cosmetic peptide and its documentation
Capped at both ends, named by cosmetic convention — and why a specification sheet is not a lot report.
Analytical methodsHow to read an HPLC chromatogram on an analytical report
Axes, the main peak, retention time, baseline, impurity peaks, and the integration table, explained in order.
SourcingHow to evaluate a research-materials supplier
Lot-matched certificates, laboratory verification, business identity, policies, and labeling: what to check before ordering.
Batch recordsPublished COA library
Locate currently published documents and compare the material name, strength, and lot identifier with the corresponding container label.
Browse documents → StandardsResearch standards
Review the site's research-use limitations, documentation approach, and boundaries for laboratory materials.
Review the standards →Traceability resources
Recordkeeping helps laboratories connect a received container, its supporting document, and the work performed with that material.
Batch traceability
A practical overview of identifiers and records used to maintain continuity from receipt through internal disposition.
View traceability → RecordsResearch ledger
Review the site's published record format and how material documentation is organized.
Open the ledger → EvidenceEvidence atlas
Navigate the available technical records and the limits of what each record establishes.
Explore the atlas →