# Peptide Quality & Verification How research peptide material is tested, what a certificate of analysis actually records, and how a buyer checks that a vial matches its paperwork. Every article in this hub is about verification, not about use. ## Articles in this hub - [Which peptide company is the most trusted?](https://www.formlaboratories.com/learn/peptide-quality-verification/which-peptide-company-is-the-most-trusted) - What regulator letters, batch tests and business records can show about peptide companies. Learn why company size cannot settle trust. - [How to read a certificate of analysis (COA)](https://www.formlaboratories.com/learn/peptide-quality-verification/how-to-read-a-certificate-of-analysis) - What a certificate of analysis shows: its fields, purpose and layout, how it differs from a safety data sheet, what purity and identity numbers prove, and where the paperwork stops. - [How to check a peptide certificate of analysis is genuine](https://www.formlaboratories.com/learn/peptide-quality-verification/how-to-check-a-peptide-coa-is-genuine) - A field-by-field checklist for a peptide certificate of analysis: match the batch, confirm the laboratory, read the test scope, and see what each check can and cannot show. - [How to check an Australian peptide supplier is legitimate](https://www.formlaboratories.com/learn/peptide-quality-verification/how-to-check-a-peptide-supplier) - Ten checks for an Australian research peptide supplier: business identity, contact details, batch documents, test scope, payment records, handling and regulatory warnings. - [What research grade actually means](https://www.formlaboratories.com/learn/peptide-quality-verification/what-research-grade-actually-means) - Research grade is a catalogue phrase, not a published standard. What named grades like ACS and USP are, and what For Research Use Only does not mean. - [What a batch or lot number lets a researcher verify](https://www.formlaboratories.com/learn/peptide-quality-verification/what-a-batch-or-lot-number-lets-a-researcher-verify) - A batch or lot number identifies one production run. What that code lets a researcher check, what it ties together, and where its verifying power stops. - [CJC-1295 with DAC vs without DAC: what is the difference?](https://www.formlaboratories.com/learn/peptide-quality-verification/cjc-1295-dac-vs-no-dac) - CJC-1295 with DAC and without DAC are two different peptides. Side-by-side sequence, half-life literature and registry numbers, and what modified GRF(1-29) means. - [Selank vs Semax: are they the same peptide?](https://www.formlaboratories.com/learn/peptide-quality-verification/selank-vs-semax) - Selank and Semax are two different seven-amino-acid peptides that share a Pro-Gly-Pro ending. A position-by-position sequence table, origins, what studies say about which is better, DSIP, and the limits of comparing studies. - [Is NAD+ a peptide?](https://www.formlaboratories.com/learn/peptide-quality-verification/is-nad-plus-a-peptide) - NAD+ is a coenzyme made of two nucleotides, not a peptide. What the PubChem, ChEBI and wwPDB records show about its structure. - [How mass spectrometry confirms peptide identity](https://www.formlaboratories.com/learn/peptide-quality-verification/how-mass-spectrometry-confirms-peptide-identity) - How mass spectrometry confirms peptide identity: what a matching mass shows, how fragmentation reads the sequence, and why identical masses call for a second test. - [How HPLC purity is measured for peptides](https://www.formlaboratories.com/learn/peptide-quality-verification/how-hplc-purity-is-measured-for-peptides) - How HPLC purity is measured for peptides: what a 99% figure means, how peak area becomes a percentage, and what the number cannot show about identity or content. - [Endotoxin, sterility and purity: three different tests](https://www.formlaboratories.com/learn/peptide-quality-verification/endotoxin-sterility-and-purity) - What an endotoxin test, a sterility test and a purity test each measure, and which of the three the 14 lab reports on file at Form Laboratories document. - [TB-500 vs thymosin beta-4: is TB-500 the same molecule?](https://www.formlaboratories.com/learn/peptide-quality-verification/tb-500-vs-thymosin-beta-4) - TB-500 and thymosin beta-4 are not the same molecule in the papers that define them: a full-length protein against a short acetylated fragment, compared side by side. - [What does a peptide cleavage predictor measure?](https://www.formlaboratories.com/learn/peptide-quality-verification/peptide-cleavage-prediction) - What peptide cleavage predictors estimate from an amino acid sequence, what cut-site scores mean, and why a computer prediction needs separate lab evidence. - [What is peptide mass fingerprinting, and what can it identify?](https://www.formlaboratories.com/learn/peptide-quality-verification/peptide-mass-and-fingerprinting) - Peptide mass, mass-to-charge ratio and mass fingerprinting explained: what a database match can identify, why sequence matters, and what purity needs. --- Canonical page: https://www.formlaboratories.com/learn/peptide-quality-verification Form Laboratories - Perth-based research-use-only peptide supplier, shipping Australia-wide. - Site guide for agents: https://www.formlaboratories.com/llms.txt - Sitemap: https://www.formlaboratories.com/sitemap.xml - Full catalogue: https://www.formlaboratories.com/shop - Contact: hello@formlaboratories.com All materials are supplied for laboratory research use only - not for human or veterinary use, and nothing on this site is medical advice.