--- title: "How to Read a COA — Peptide Purity Verification Guide" description: "Learn to read and verify Certificates of Analysis for research peptides. Check purity, identify red flags, and use our free COA analyzer tool." lang: en json-ld: | [ { "@context": "https://schema.org", "@type": "Article", "headline": "How to Read & Verify a Certificate of Analysis (COA)", "description": "Learn to read and verify Certificates of Analysis for research peptides. Check purity, identify red flags, and use our free COA analyzer tool.", "url": "https://www.bodyhackguide.co/guides/coa-verification", "author": { "@type": "Organization", "name": "BodyHackGuide", "url": "https://www.bodyhackguide.co" }, "publisher": { "@type": "Organization", "name": "BodyHackGuide", "url": "https://www.bodyhackguide.co" } }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "What is a COA for peptides?", "acceptedAnswer": { "@type": "Answer", "text": "A Certificate of Analysis (COA) is a lab-issued document that verifies a peptide's identity, purity, and safety. It reports HPLC purity percentage, mass spectrometry confirmation of molecular weight, endotoxin levels, sterility testing, and the testing lab's name and accreditation. Reputable research peptide vendors publish a COA per batch so buyers can verify exactly what is in the vial." } }, { "@type": "Question", "name": "What purity percentage should I look for on a peptide COA?", "acceptedAnswer": { "@type": "Answer", "text": "For research peptides, look for 98% or higher purity by HPLC. Anything below 95% is considered low-grade and should be avoided for research use. The COA must explicitly state the purity method (HPLC at 220 nm is standard) and the observed molecular weight must match the expected value by mass spectrometry within the lab's stated tolerance." } }, { "@type": "Question", "name": "How do I verify if a peptide COA is real?", "acceptedAnswer": { "@type": "Answer", "text": "Check five things: (1) the COA lists a real accredited lab such as Janoshik Analytical or Alkemist Labs, (2) the batch or lot number on the COA matches the physical product label, (3) the test date is within the past 12 months, (4) every reported result shows the testing method next to it, and (5) the purity is ≥95% (ideally ≥98%). Red flags include missing lab name, generic template COAs, no batch number, or implausibly perfect 100% purity with no method listed." } }, { "@type": "Question", "name": "Which peptide vendors provide third-party COAs?", "acceptedAnswer": { "@type": "Answer", "text": "Most reputable research-chemical vendors publish COAs per batch, typically tested by Janoshik Analytical or similar independent analytical labs. BodyHackGuide's vendor directory flags which vendors publish third-party COAs for each batch, and the Vendor Trust Scorecard grades vendors on COA transparency, consistency, and publication frequency." } }, { "@type": "Question", "name": "What does Janoshik testing mean?", "acceptedAnswer": { "@type": "Answer", "text": "Janoshik Analytical is a Slovakia-based independent analytical lab widely used by research-peptide vendors for third-party HPLC and mass spectrometry testing. A 'Janoshik tested' COA means the batch was verified by this external lab rather than the vendor's in-house lab. Janoshik has become an informal standard in the research-peptide community because their reports are detailed, consistent, and traceable to the testing instrument." } }, { "@type": "Question", "name": "Can a vendor fake a COA?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — and it happens. Common fakes include using a generic template with no batch number, copying another lab's branding, reporting unrealistic 100% purity with no method, listing a test date that never changes across batches, or posting a single COA and claiming it applies to all products. Always cross-reference the batch number on the physical product with the COA, verify the lab exists and has the stated accreditation, and run the COA through an analyzer tool to spot inconsistencies." } } ] }, { "@context": "https://schema.org", "@type": "HowTo", "name": "How to Verify a Peptide Certificate of Analysis", "description": "Step-by-step process for reading and verifying a research peptide COA before use.", "totalTime": "PT3M", "step": [ { "@type": "HowToStep", "position": 1, "name": "Confirm identity", "text": "Check that the compound name on the COA matches the product label exactly and that the molecular weight observed by mass spec matches the expected value." }, { "@type": "HowToStep", "position": 2, "name": "Check purity", "text": "Look for HPLC purity of 98% or higher. Confirm the method (HPLC at 220 nm is standard) is listed next to the result." }, { "@type": "HowToStep", "position": 3, "name": "Verify the lab", "text": "Confirm the testing lab is a real, accredited third-party lab such as Janoshik Analytical or Alkemist Labs — not the vendor's in-house lab." }, { "@type": "HowToStep", "position": 4, "name": "Check dates and batch", "text": "The test date should be within the past 12 months and the batch or lot number must match the physical product label." }, { "@type": "HowToStep", "position": 5, "name": "Scan for red flags", "text": "Reject COAs with missing lab names, generic templates, no batch number, implausibly perfect 100% purity, or recycled test dates across multiple products." } ] }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://www.bodyhackguide.co" }, { "@type": "ListItem", "position": 2, "name": "Guides", "item": "https://www.bodyhackguide.co/guides" }, { "@type": "ListItem", "position": 3, "name": "COA Verification", "item": "https://www.bodyhackguide.co/guides/coa-verification" } ] }, { "@context": "https://schema.org", "@type": "Article", "headline": "How to Read & Verify a Certificate of Analysis (COA)", "description": "Learn to read and verify Certificates of Analysis for research peptides. Check purity, identify red flags, and use our free COA analyzer tool.", "url": "https://www.bodyhackguide.co/guides/coa-verification", "author": { "@type": "Organization", "name": "BodyHackGuide", "url": "https://www.bodyhackguide.co" }, "publisher": { "@type": "Organization", "name": "BodyHackGuide", "url": "https://www.bodyhackguide.co" } }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "What is a COA for peptides?", "acceptedAnswer": { "@type": "Answer", "text": "A Certificate of Analysis (COA) is a lab-issued document that verifies a peptide's identity, purity, and safety. It reports HPLC purity percentage, mass spectrometry confirmation of molecular weight, endotoxin levels, sterility testing, and the testing lab's name and accreditation. Reputable research peptide vendors publish a COA per batch so buyers can verify exactly what is in the vial." } }, { "@type": "Question", "name": "What purity percentage should I look for on a peptide COA?", "acceptedAnswer": { "@type": "Answer", "text": "For research peptides, look for 98% or higher purity by HPLC. Anything below 95% is considered low-grade and should be avoided for research use. The COA must explicitly state the purity method (HPLC at 220 nm is standard) and the observed molecular weight must match the expected value by mass spectrometry within the lab's stated tolerance." } }, { "@type": "Question", "name": "How do I verify if a peptide COA is real?", "acceptedAnswer": { "@type": "Answer", "text": "Check five things: (1) the COA lists a real accredited lab such as Janoshik Analytical or Alkemist Labs, (2) the batch or lot number on the COA matches the physical product label, (3) the test date is within the past 12 months, (4) every reported result shows the testing method next to it, and (5) the purity is ≥95% (ideally ≥98%). Red flags include missing lab name, generic template COAs, no batch number, or implausibly perfect 100% purity with no method listed." } }, { "@type": "Question", "name": "Which peptide vendors provide third-party COAs?", "acceptedAnswer": { "@type": "Answer", "text": "Most reputable research-chemical vendors publish COAs per batch, typically tested by Janoshik Analytical or similar independent analytical labs. BodyHackGuide's vendor directory flags which vendors publish third-party COAs for each batch, and the Vendor Trust Scorecard grades vendors on COA transparency, consistency, and publication frequency." } }, { "@type": "Question", "name": "What does Janoshik testing mean?", "acceptedAnswer": { "@type": "Answer", "text": "Janoshik Analytical is a Slovakia-based independent analytical lab widely used by research-peptide vendors for third-party HPLC and mass spectrometry testing. A 'Janoshik tested' COA means the batch was verified by this external lab rather than the vendor's in-house lab. Janoshik has become an informal standard in the research-peptide community because their reports are detailed, consistent, and traceable to the testing instrument." } }, { "@type": "Question", "name": "Can a vendor fake a COA?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — and it happens. Common fakes include using a generic template with no batch number, copying another lab's branding, reporting unrealistic 100% purity with no method, listing a test date that never changes across batches, or posting a single COA and claiming it applies to all products. Always cross-reference the batch number on the physical product with the COA, verify the lab exists and has the stated accreditation, and run the COA through an analyzer tool to spot inconsistencies." } } ] }, { "@context": "https://schema.org", "@type": "HowTo", "name": "How to Verify a Peptide Certificate of Analysis", "description": "Step-by-step process for reading and verifying a research peptide COA before use.", "totalTime": "PT3M", "step": [ { "@type": "HowToStep", "position": 1, "name": "Confirm identity", "text": "Check that the compound name on the COA matches the product label exactly and that the molecular weight observed by mass spec matches the expected value." }, { "@type": "HowToStep", "position": 2, "name": "Check purity", "text": "Look for HPLC purity of 98% or higher. Confirm the method (HPLC at 220 nm is standard) is listed next to the result." }, { "@type": "HowToStep", "position": 3, "name": "Verify the lab", "text": "Confirm the testing lab is a real, accredited third-party lab such as Janoshik Analytical or Alkemist Labs — not the vendor's in-house lab." }, { "@type": "HowToStep", "position": 4, "name": "Check dates and batch", "text": "The test date should be within the past 12 months and the batch or lot number must match the physical product label." }, { "@type": "HowToStep", "position": 5, "name": "Scan for red flags", "text": "Reject COAs with missing lab names, generic templates, no batch number, implausibly perfect 100% purity, or recycled test dates across multiple products." } ] }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://www.bodyhackguide.co" }, { "@type": "ListItem", "position": 2, "name": "Guides", "item": "https://www.bodyhackguide.co/guides" }, { "@type": "ListItem", "position": 3, "name": "COA Verification", "item": "https://www.bodyhackguide.co/guides/coa-verification" } ] } ] --- [Skip to content](#main-content) ## Research Use Only This site is an **educational resource** for research compounds. We do **not endorse** human consumption of any compound. BodyHackGuide and **BHG Labs share common ownership**; we rank every vendor on the same public methodology, and we earn a commission on purchases through our links. By entering, you confirm you are **21 years of age or older** and agree to our [Terms](/terms) & [Privacy Policy](/privacy). I'm 21+ — Enter SiteLeave site [![BodyHackGuide](/assets/bodyhackguide-logo-DOzZNUyh.webp)BodyHackGuide ](/) [Compare](/compare)[Wiki](/wiki)[Vendors](/vendors)[Deals](/deals)[Stacks](/stack-builder)[Nootropics](/nootropics)[Tools](/tools) Learn Community Search ⌘K [Sign In](/auth?returnTo=%2Fguides%2Fcoa-verification) 100K+ researchers trust BodyHackGuide — Join [r/BodyHackGuide](https://reddit.com/r/bodyhackguide) 1. [Home](/) 2. [Guides](/guides) 3. COA Verification # How to Read & Verify a Certificate of Analysis (COA) A practical guide to checking peptide purity, spotting red flags, and verifying independent lab reports. A **Certificate of Analysis (COA)** is the single most important document when evaluating a research peptide. It tells you what's actually in the vial — the identity of the compound, its purity, and whether it passed independent safety testing. Without a valid COA, you are trusting the vendor's label alone, which is not an acceptable standard for research use. The research-peptide market is unregulated. Two vials with identical labels can contain very different materials. A third-party COA from an accredited lab is the only way to close that gap. This guide walks through the five things to check on every COA, the common red flags used in fakes, and how to use BodyHackGuide's free COA analyzer to validate any report in seconds. ## The 5 Things to Check on Every COA 1 ### Identity confirmation The compound name on the COA must match the product label exactly. Mass spectrometry (MS) should confirm the observed molecular weight matches the expected value (e.g., BPC-157 expected MW 1419.5 Da). If the MS result is missing or the MW doesn't match, the vial may contain the wrong compound — or no peptide at all. 2 ### Purity percentage Look for ≥98% purity by HPLC for peptides and ≥95% for nootropics. The method must be stated explicitly — HPLC at 220 nm is the standard wavelength for peptide purity. A result like '99.8%' with no method listed is not a valid purity claim. 3 ### Testing lab name and accreditation The lab should be an independent third party, not the vendor's in-house lab. Janoshik Analytical (Slovakia) and Alkemist Labs (US) are two commonly cited independent labs in the research-peptide space. The lab name, address, and ideally accreditation status (ISO 17025) should appear on the report. 4 ### Date of analysis The COA should be recent — ideally within the last 6 months, and definitely within 12 months. An old COA may not reflect the current batch. If every product on a vendor's site shows the same test date across multiple batches, the COA is almost certainly recycled. 5 ### Batch / lot number matching The batch or lot number printed on the COA must match the number on the physical vial. This is the critical link that proves the test was performed on the batch you actually received. If the numbers don't match — or if no batch number is listed at all — treat the COA as untrusted. ## Red Flags: When to Reject a COA - No lab name listed, or a lab name that can't be verified as a real third-party facility. - Purity below 95%, or a purity figure reported with no testing method stated. - Generic COA template with no logos, signatures, or identifying lab details. - Test date is missing, is more than 12 months old, or is identical across multiple products and batches. - Batch or lot number is missing from the COA or does not match the physical product label. - The molecular weight reported by mass spec does not match the expected MW for the compound. - The COA PDF has been edited — look for mismatched fonts, pixelated text, or overlapping layers when opened in a PDF reader. - A single COA is published on the vendor's site and claimed to apply to 'all batches' — COAs are per-batch by definition. ## How to Use BodyHackGuide's Free COA Analyzer BodyHackGuide's [free COA Analyzer](/tools/coa) reads any peptide Certificate of Analysis PDF and extracts the key data points automatically. It cross-checks purity, mass spec identity, endotoxin level, and sterility result against expected thresholds, then returns a PASS / CAUTION / FAIL grade in seconds. 1. Download the COA PDF from your vendor (or save it from their product page). 2. Open the [COA Analyzer](/tools/coa) and drag-and-drop the PDF into the upload box. 3. Review the extracted data: HPLC purity, expected vs observed MW, endotoxin, sterility, batch number, and lab name. 4. Check the overall grade banner — PASS (all checks clear), CAUTION (missing or borderline data), or FAIL (purity below threshold, failed sterility, or missing critical fields). 5. If the grade is CAUTION or FAIL, compare the flagged fields against the checklist above and reach out to the vendor for clarification. [Open the Free COA Analyzer](/tools/coa) ## Which Vendors Publish COAs? BodyHackGuide tracks 10 research-peptide vendors. The table below highlights the BHG-tracked vendors that publish per-batch Certificates of Analysis. For trust scores and full sourcing details on each vendor, see the [vendor directory](/vendors). Vendor COA Practice Testing [ResearchChemHQ](/vendors/researchchemhq) Per batch Third-party HPLC [Optimum Formula](/vendors/optimum-formula) Per batch Third-party HPLC [Ion Peptide](/vendors/ion-peptide) Per batch Third-party HPLC [BioMyst Labs](/vendors/biomyst-labs) Per batch Third-party HPLC [Paramount Peptides](/vendors/paramount-peptides) Per batch Third-party HPLC [Limitless Biochem EU](/vendors/limitless-biochem-eu) Per batch Third-party HPLC [VANDL Labs](/vendors/vandl-labs) Per batch Third-party HPLC Source: BHG Vendor Trust Scorecard, last reviewed 2026-05-06. Lab info reflects each vendor's stated CoA practice on their product pages — verify the actual lab name on the COA before trusting any specific batch. [View the full vendor directory →](/vendors) ## Worked Example: BPC-157 A valid BPC-157 COA should include: - **Compound name:** BPC-157 (matches vial label) - **Expected MW:** 1419.5 Da - **Observed MW by MS:** 1419.4–1419.6 Da - **HPLC purity:** ≥98% at 220 nm - **Lab:** Janoshik Analytical (or similar third party) - **Test date:** within last 6 months - **Batch number:** matches the vial label See the [BPC-157 compound page](/compound/bpc-157) for background on the molecule, reconstitution defaults, and vendor pricing. ## Frequently Asked Questions ### What is a COA for peptides? ### What purity percentage should I look for on a peptide COA? ### How do I verify if a peptide COA is real? ### Which peptide vendors provide third-party COAs? ### What does Janoshik testing mean? ### Can a vendor fake a COA? B [BioChonch](/about)Founder & Lead Researcher Researcher and founder of BodyHackGuide. Obsessed with evidence-based biohacking, peptide science, and nootropic protocols. Every recommendation is backed by PubMed citations and real-world testing. [](https://x.com/bodyhackguide)[](https://reddit.com/r/bodyhackguide)[](https://discord.gg/Mhq5UdRYBA)| [About the author](/about) ### Related Tools & Guides [How to Read a Peptide COA (identity + dose) ](/how-to-read-a-peptide-coa)[Free COA Analyzer ](/tools/coa)[Vendor Trust Scorecard ](/vendor-trust-scorecard)[Research Peptide Vendor Directory ](/vendors)[Reconstitution Calculator ](/tools/reconstitution)[BPC-157 Compound Page ](/compound/bpc-157)[All Guides ](/guides) ![BodyHackGuide](/assets/bodyhackguide-logo-DOzZNUyh.webp) ### BodyHackGuide Your biohacking research hub — compound pricing, brain health protocols, dosing tools, and vendor reviews. 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We rank every vendor on the same public, reproducible [methodology](/vendors/methodology), and we earn a commission from purchases made through our links at no extra cost to you. Full details in our [affiliate disclosure](/affiliate-disclosure). **Research Disclaimer:** All compounds listed are for laboratory and research purposes only. Not for human consumption. This site does not sell, distribute, or promote any products. Always consult a qualified healthcare professional and comply with local regulations. © 2026 BodyHackGuide. All rights reserved. · [Terms](/terms) · [Privacy](/privacy) [Shop BHG Labs · 20% off with BHG20](https://bhglabs.co/shop/?utm_source=reddit&utm_medium=paid&utm_campaign=bhg20_bridge&utm_content=sticky_mobile_bar&coupon=BHG20) hi 👋