Guides
105 plain answers to what people ask before they test a peptide.
start here
- choosing a lab How to test peptides: get your vials lab tested in 9 steps, from choosing tests to verifying the report
- choosing a lab How to choose a peptide testing lab: 12 checks before you send a vial
- coas and verification How to verify a peptide COA: a 6-step check that works for any lab
- china and hong kong Peptide testing in China: how to test peptides made by Chinese manufacturers
Choosing a lab
- How to choose a peptide testing lab: 12 checks before you send a vial How to choose the best peptide testing lab for your vial: 12 checks on identity, raw data, safety tests and verification, drawn from 26 lab report formats.
- Peptide testing labs compared: tests, identity methods, turnaround and verification for 19 labs Peptide testing labs compared side by side: tests, identity method, endotoxin and sterility, published turnaround and report checks for 19 labs.
- Third party peptide testing: what it means and how to check a seller's 'third party tested' claim Third party peptide testing explained: what it means, five ways independence breaks down between seller and lab, and how to check a 'third party tested' claim.
- Where to test peptides: mail-in peptide testing labs by country and region Where to test peptides near you: mail-in peptide testing labs in the US, Europe, Canada and Australia, what to do if none is local, and free options.
- How long does peptide testing take? Turnaround at 17 labs, and what slows it down How long does peptide testing take? Stated turnaround at 17 labs, why sterility needs 14 days, and the common reasons results arrive late.
- Peptide testing cost: how much a test costs in 2026, what drives the price and what costs extra How much peptide testing costs in 2026: typical prices by test, what drives the bill, the usual extras, and how group tests split the cost.
- Full panel peptide test: what each test answers, and which ones you can skip A full panel peptide test, test by test: what identity, purity, content, endotoxin, sterility and the rest answer, and which ones to skip for your purpose.
- Peptide testing in the USA: labs by state, what each one tests and how to check its reports Peptide testing labs in the USA compared by identity method, safety tests, published turnaround and report checks, with labs in Texas, Florida and California.
- Peptide testing in the UK and Europe: labs, what each one tests and how to send samples Peptide testing in Europe and the UK: labs in Prague, Wrocław, Zagreb, Switzerland and London, what each tests, turnaround and how to check reports.
- Peptide testing in Canada: the labs in Ontario, what each one tests and how to send samples Peptide testing in Canada: Testides, SideChain Analytics and Peptide Test Canada compared on methods, turnaround and report checks, plus labs abroad.
- Peptide testing in Australia: the local lab, what it tests and how to send samples overseas Peptide testing in Australia: what the Sydney lab Ozcanium Analytics tests, how to check its reports, and how to send vials to an overseas lab from any state.
- How to test peptides: get your vials lab tested in 9 steps, from choosing tests to verifying the report How to test peptides: choose the tests and the lab, get a quote, send sealed and numbered vials with tracking, then read and verify the report. Nine steps.
- Public peptide test results: where to find them and how to weigh what you read Where public peptide test results live (Finnrick, Peptigrity, PeptideBenchmark, Disclosed Labs, lab databases) and five checks before you trust one.
Cost and value
- Cheapest peptide testing lab: how to get a full, checkable result for less Cheapest peptide testing lab in 2026: the lowest published prices, what the lowest price leaves out, and how to pay less and keep the evidence.
- Peptide testing price comparison 2026: published prices by lab, side by side Peptide testing price comparison, checked September 2026: core test, GLP-1, endotoxin and sterility prices at Janoshik, Freedom, Chromate, Vanguard and more.
- Free peptide testing: what free and community tests cover, who pays and what they leave out Free peptide testing in 2026: what Finnrick's community tests and seller-paid tests cover, who pays the lab, what they leave out and when to pay.
- Endotoxin test cost and sterility test cost: what labs charge, and what cheaper methods leave out Endotoxin test cost and sterility test cost in 2026: published lab prices for LAL and USP <71>, gel-clot, PCR screens, extra vials and what cheaper tests miss.
- Peptide purity testing cost: what an HPLC test costs, what LC-MS adds and what purity alone misses Peptide purity testing cost in 2026: published HPLC and LC-MS prices by lab, what mass spectrometry adds, and what a purity-only test cannot tell you.
- Affordable peptide testing lab: why testing in Hong Kong can cost less, and what stays the same Affordable peptide testing lab: what lowers the price, what testing in Hong Kong changes, prices in Asia, and the evidence that must stay the same.
- Cheap peptide testing: is it reliable? 8 checks for a low-price lab Cheap peptide testing can be reliable, and price says little about the method. 8 checks for any low-price lab, plus what Reddit buyers say about it.
China and Hong Kong
- Peptide testing in China: how to test peptides made by Chinese manufacturers Peptide testing in China: what to test in peptides from Chinese manufacturers, where to send samples, and how to read a factory COA against a lab result.
- Sending peptide samples from mainland China to Hong Kong for testing How to send peptide samples from mainland China to a Hong Kong lab: choosing a courier, declaring the contents accurately, packing, the custody form, tracking.
- How to check a Chinese manufacturer's peptide COA before you rely on it China COA verification for peptides: what a factory COA usually shows, what it leaves out, six checks you can run yourself, and when to test the batch.
- Pre-shipment testing in China: how peptide brands test a batch before it ships Pre shipment inspection in China checks cartons and labels. A peptide batch also needs a lab test: what to ask the factory, how to sample and what to test.
- Testing bulk peptide powder before you buy a batch: sampling, tests and retained samples Peptide raw material testing for bulk powder from China: how to sample a lot, which tests matter (identity, purity, content, salt, water, solvents) and why.
- How to vet a Chinese peptide manufacturer: a 12-point testing checklist for new brands Chinese peptide manufacturers vary in in-house QC. A 12-point testing checklist for new brands: documents to ask for, samples to test, factory COAs to check.
- Peptide testing in Hong Kong: what the lab tests and how samples reach it Peptide testing in Hong Kong: the tests HK Analytical runs, how samples reach the lab from Hong Kong, mainland China and abroad, and how reports are verified.
- Peptide testing in Asia: options for buyers and brands in Asia-Pacific Peptide testing in Asia: the labs in Australia, India and Hong Kong that test peptides, what buyers in Singapore can do, and how to mail samples to labs abroad.
- Factory COA vs an outside lab: why the numbers differ, and when the gap matters Manufacturer COA vs third party test: why a factory COA and an outside lab give different numbers for the same peptide, and which gaps point to a real problem.
- How to start a peptide company: what to test before your first batch ships Starting a white label or private label peptide brand? What to test before the first batch ships, what rating sites check and how to publish per-lot reports.
- Where are peptides made? How research peptides are produced, and why so many come from China Where are peptides made? How research peptides are synthesised, what FDA and lab records show about China, and the sourced reasons so many come from there.
- Are peptides from China safe? What published lab results show about quality Are peptides from China safe? A lab test cannot say. What 11,999 published tests show about quality by seller location, and how to check a batch.
COAs and verification
- How to verify a peptide COA: a 6-step check that works for any lab Verify a peptide COA in six steps: open the lab's own lookup, match the ID, batch and dates, compare the vial photo, then check the file fingerprint.
- Fake peptide COA: 15 signs a certificate is forged, borrowed or too weak to trust How to spot a fake peptide COA: 15 signs a certificate was forged, edited, borrowed from another batch, or is real but too thin to prove much.
- Peptide vendor COA vs testing your own vial: what each one proves A peptide vendor COA describes the vial the seller sent to a lab. Here is what it can and cannot prove, and when testing your own vial is worth it.
- Reused COAs: how one peptide test report ends up on many products Reused COA data: how one peptide lab report ends up on other batches, strengths and sellers, what rating sites count, and eight checks to catch it.
- Peptide purity on a COA: what the number means, what it does not tell you and how to test for it Peptide purity on a COA, explained for buyers: what the percentage means, why one vial can give different numbers, how to read it and how to get it tested.
- Net peptide content: why a 10 mg peptide vial does not hold 10 mg of peptide Net peptide content explained: what else is in the powder, how to calculate peptide content, and why labs report different mg for the same vial.
- Signed COAs: how a digital signature shows a peptide report was not edited How a signed COA works: an Ed25519 signature over a canonical record, a public key anyone can use, and what a signature proves about a lab report.
- White-label COAs: why a lab report under a seller's brand breaks trust What a white-label COA is, the forms it takes in the peptide market, why it hides who measured and who paid, and how to check any report's real lab.
Test methods
- HPLC peptide purity: how the test works, what it misses, peak purity and aggregation HPLC peptide purity as a method: how the run and peak integration work, what HPLC cannot see, peak purity, aggregation and what a good report shows.
- Mass spectrometry peptide identity: why retention time alone is not enough Mass spectrometry peptide identity explained: how LC-MS matches a peptide's mass, why retention time alone can pass the wrong peptide, and what a COA shows.
- HPLC vs mass spec for peptides: which test answers which question HPLC vs mass spec: HPLC with UV measures how much, mass spectrometry measures which molecule. A table of peptide testing methods and what each answers.
- TFA in peptides: what a TFA salt is, how much of the powder it is, and how labs test and remove it TFA peptide salts explained: how TFA gets into synthetic peptides, how much of the powder it can be, how labs test for it and what TFA removal means.
- Peptide water content: Karl Fischer testing and why water changes net peptide content Peptide water content explained: why freeze-dried powder holds water, coulometric vs volumetric Karl Fischer, and how water shifts net peptide content.
- Residual solvents test for peptides: ICH Q3C classes, limits and headspace GC A residual solvents test measures DMF, DCM, acetonitrile and ethers left from making a peptide. ICH Q3C classes, ppm limits and how to read a GC result.
- Peptide degradation: how storage and shipping change what a lab test finds Peptide degradation explained: how heat, moisture, oxygen and time change a vial, the main pathways, and how HPLC and LC-MS show the damage.
- Peptide blend testing: why each peptide in the vial needs its own identity and mg Peptide blend testing explained: why each peptide in a blend needs its own identity and mg, why one purity number misleads, and what to ask a lab first.
- Which GLP-1 is in my vial? Blind GLP-1 identification for semaglutide, tirzepatide and retatrutide Which GLP-1 is in my vial? How a blind GLP-1 test names semaglutide, tirzepatide or retatrutide by mass, without the label, and how to read the result.
- Peptide test accuracy: what ± and k = 2 on a COA tell you, and how repeatable a result is Peptide test accuracy explained: what ± and k = 2 mean on a COA, how repeatable results are, and how to read a result near the label or a limit.
Safety tests
- Endotoxin testing for peptides: LAL methods, EU per mg and how to read the result Endotoxin testing for peptides: the USP <85> LAL methods, what EU per mg and EU per vial mean, and how to read the LOQ, replicates and spike recovery.
- Endotoxin vs sterility: two tests that answer different questions Endotoxin vs sterility: what the LAL test and the 14-day USP <71> test each measure, why a sterile vial can still hold endotoxin, and what to ask a lab for.
- Sterility testing for peptides: USP <71> vs PCR screens vs microbial counts Sterility testing for peptides: how the 14-day USP <71> test works, how many vials it needs, and why PCR screens and microbial counts are not sterility tests.
- How to choose the best lab for endotoxin testing: what 21 peptide labs report Looking for the best lab for endotoxin testing? What 21 peptide labs say they report: LAL method, unit, a number or a pass, with a source for each.
- How to choose the best lab for sterility testing: which labs run the 14-day USP <71> test Choosing the best lab for sterility testing: which peptide labs list the 14-day USP <71> test, which sell counts or PCR screens, and what to ask first.
- Bioburden test: what a microbial count measures, and why it is not a sterility test A bioburden test counts live microbes in CFU per gram or mL under USP <61>. How it works, how to read the count, and why it is not a sterility test.
Contaminant testing
- How to test for microplastics: detection methods, size limits and what a lab report shows How to test for microplastics: how labs detect them by µ-FTIR, Raman, LDIR and pyrolysis GC/MS, their size limits, why blanks matter, and what home kits miss.
- Microplastics in supplements and peptides: what studies found and how a lab tests for them Microplastics in supplements: what studies found in fish oil, fibre and spirulina, how labs detect them, and what is known about peptides.
- What is PFAS testing? Lab methods, standards, kits and what drives the cost What is PFAS testing? How labs measure forever chemicals by LC-MS/MS, what EPA 533, 537.1 and 1633A cover, what kits show and what drives the cost.
- PFAS in dietary supplements and peptides: what has been measured and how a lab tests for them PFAS in dietary supplements: what studies found, how labs test consumer products, why TFA in peptides counts as a PFAS, and how to read a result.
- Can you test for BPA? BPA testing methods, standards, kits and what a report shows Can you test for BPA? Yes. How labs measure it by LC-MS/MS and GC-MS, the EU limits, what test strips miss, and how to read a BPA-free test report.
- Extractables and leachables testing: what vials, stoppers and pens can add to a peptide Extractables and leachables testing explained: USP <1663> and <1664>, FDA guidance, the ICH Q3E draft, the AET formula, phthalates, and what stoppers add.
Compounds
- Retatrutide testing: what a full lab test shows and how published samples fail Retatrutide testing explained: what LC-MS, HPLC and mg results show, how often published samples fail (Finnrick data) and how to get a vial tested.
- Tirzepatide testing: purity, impurities, mg per vial and how published samples fail Tirzepatide testing explained: what HPLC purity, LC-MS identity and mg per vial show, how often published samples fail, and how to read a test report.
- Semaglutide testing: methods, impurity profile, salt forms and how published samples fail Semaglutide testing explained: LC-MS identity, HPLC purity and impurities, salt forms, mg per vial, and how often published samples fail (Finnrick data).
- Cagrilintide testing: what a lab test shows, semaglutide mix-ups and how published samples fail Cagrilintide testing explained: LC-MS identity, HPLC purity and mg per vial, mix-ups with semaglutide, blends, and how often published samples fail.
- BPC-157 testing: purity, mg per vial, salt forms and why half of published samples fail BPC-157 testing explained: LC-MS identity, HPLC purity, mg per vial and salt forms, why about half of published samples fail, and how to read a report.
- TB-500 testing: what a full panel shows and how TB-500 samples fail in published tests TB-500 test results explained: which molecule the lab looked for, purity and mg per vial, and how 175 of 282 TB-500 samples failed in Finnrick's data.
- GHK-Cu test: what a full panel shows, why the copper ratio matters and how samples fail GHK-Cu test results explained: LC-MS identity, HPLC purity, mg per vial, the copper-to-peptide ratio, and why most recent fails were on fill.
- Tesamorelin testing: what a lab test shows, published test results and how samples fail Tesamorelin testing explained: LC-MS identity, HPLC purity, mg per vial, a 54% fail share in published data, and one batch that two labs scored differently.
- CJC-1295 test and ipamorelin test: which molecule, what a full panel shows and how samples fail CJC-1295 test results explained: DAC or no DAC, purity and mg per vial, how 236 of 333 published CJC-1295 tests failed, and how ipamorelin compares.
- Which peptides fail lab tests most often: fail rates by peptide from published test data Peptide fail rates ranked: CJC-1295, TB-500, tesamorelin and BPC-157 fail most often in Finnrick's published data. What 'fail' means and the caveats.
- MOTS-c test, NAD+ and other less-tested compounds: what a lab checks and how often samples fail MOTS-c and NAD+ testing explained, with KPV, SS-31, Semax, PT-141 and more: what a lab checks, published fail rates, and what to ask before you send.
- hGH testing: what a lab test shows for identity, content, purity and dimers What an hGH test should show: identity of the 191-amino-acid protein, mg and IU per vial, purity, and dimers by SEC. Plus 18 published hGH test results.
Fake and underdosed
- How to tell if your peptides are real: what to test first and what to check on a COA Are my peptides real? Only a lab test can say. What to test first (identity by LC-MS, then mg per vial), what to check on a COA, and what looks cannot show.
- Underdosed peptides: how to read the mg result, and why overfilled vials fail too Underdosed peptides: how to read a lab's mg result, how basis and uncertainty change it, Finnrick's ±35% fill rule, and why overfilled vials fail too.
- Fake peptides: the five failure types seen in published lab tests, and the test that catches each Fake peptides in published tests: wrong compound, no peptide, low content, low purity and endotoxin, with sourced data and the lab test that catches each one.
- Peptide test kits and test strips: can you test peptides at home? Peptide test kits and strips explained: what home tests can and cannot show, why no kit identifies retatrutide or BPC-157, and what LC-MS, HPLC and LAL need.
Sending samples
- How to send peptides for lab testing: choosing vials, labels, the sample form, packing and tracking How to send peptides for testing: get the sample form, pick and number sealed vials, fill in the custody form, pack, ship with tracking and check the receipt.
- How many vials for peptide testing: what a full panel needs, and why some tests need their own vial How many vials for peptide testing: why identity, purity and content share one vial while endotoxin, sterility and batch consistency need more, with examples.
- Anonymous peptide testing: what a lab needs to know about you, and what it does not Anonymous peptide testing: what a lab must know about you, what the test does not need, what prints on the report, and where payment leaves a trail.
Group tests and vendors
- Peptide group test: how to run one, from choosing the batch to sharing the report A peptide group test splits one lab order across buyers of the same batch. Step by step: tests, vials, money, shipping and sharing the report.
- Group buy testing checklist: 8 things peptide group test organisers forget Group buy testing goes wrong in the same eight places. A checklist for organisers: content in mg, random vials, hidden label claims, safety vials, money rules.
- Peptide batch testing for vendors: third party testing your customers can check Vendor third party testing, batch by batch: which tests to run, how many vials to send, what rating sites check and how to publish results customers can verify.
- Which lab do vendors accept? Why sellers honour some labs' results and not others Which lab do vendors accept for refund claims? Why sellers trust some labs' results, what they check before honouring one, and how to make your own test count.
Accreditation and trust
- ISO 17025 peptide testing: what accreditation covers and how to check a lab's scope ISO 17025 peptide testing explained: what accreditation covers, how to check a lab's scope on A2LA or PJLA, and which scopes named peptides in 2026.
- Is a peptide lab independent? How to check who owns a testing lab Is a peptide lab independent? How to check who owns a testing lab in company registers, what rating sites flag, and what to ask before you trust a report.
- 99% purity peptide results: why 99.9% can be a warning sign, and how to read the decimals What a 99% purity peptide result means, why 99.9x% figures and very narrow purity spreads draw doubt from rating sites, and how to check the decimals.
- Peptide lab results differ: why labs disagree on the same batch, and how to compare two results Peptide lab results differ for known reasons: net vs gross mg, reference standards, salt and water, single injections and integration. Published cases inside.
Labs by name
- Janoshik review: tests, turnaround, how to verify a report and how to order Janoshik review: the tests and methods the lab lists, its published turnaround, how to verify a Janoshik report with the unique key, and who it suits.
- Freedom Diagnostics review: peptide tests, turnaround, COA lookup and how to order Freedom Diagnostics review: the peptide tests and methods it lists, its published 1–3 business day turnaround, how to look up a COA, and who the lab suits.
- Vanguard Laboratory review: peptide packages, accreditation scope, COA lookup and ordering Vanguard Laboratory review: the Olympia lab's peptide packages, what its ISO/IEC 17025 scope covers, how to look up a Vanguard COA, and how to order.
- Chromate review: peptide tests, published methods, COA verification and how to order Chromate review: the Hudson, NH lab's peptide and supplement tests, its published methods, how to verify a Chromate COA, how to order and who it suits.
- Krause Analytical review: peptide tests, methods, COA verification and how to order Krause Analytical review: the Austin, TX lab's peptide tests and methods, how to verify a Krause COA, how to order, its Finnrick role and who it suits.
- MZ Biolabs review: mass-spec peptide testing, what the COA shows, verification and ordering MZ Biolabs review: the Tucson lab's HPLC and QTOF mass-spec peptide testing, what its COA shows, how to check a report, how to order and who it suits.
- Testides review: peptide testing in Canada, methods, evidence reports and verification Testides review: how the Ontario service works with its partner lab, the methods it lists, its 10-day results promise, how to verify a report and how to order.
- Analiza Białek review: the Wrocław lab's tests, turnaround, verification and ordering Analiza Białek review: what the Wrocław lab tests and how, its stated turnaround, how to verify a report with the order number and password, and who it suits.
- Janoshik alternatives: labs that test the same peptides, compared by method, turnaround and report checks Janoshik alternatives in the US, Europe, Canada and Australia, compared by identity method, endotoxin and sterility tests, turnaround and report checks.
- Janoshik vs Freedom Diagnostics: tests, turnaround, reports and same-batch results compared Janoshik vs Freedom Diagnostics side by side: tests, identity method, sterility, turnaround and report checks, plus published same-batch results.
- Finnrick explained: how its peptide testing, lab network and vendor ratings work How Finnrick works: free and paid peptide testing, which labs run the tests, how vendor pass rates are scored, and what a rating cannot tell you.
- Finnrick alternatives: where to test your own peptide vial, privately and with the lab you choose Finnrick alternatives for testing your own vial: labs you can order from directly, group-test platforms and other rating sites, compared with sources.
- Peptide vendor ratings compared: Finnrick, Peptigrity, PeptideBenchmark, Peptide Critic, PeptIQ and others Peptide vendor ratings compared: how Finnrick, Peptigrity, PeptideBenchmark, Disclosed Labs, Merit Verified, PeptIQ and Peptide Critic score labs and sellers.
- Freedom Diagnostics alternatives: peptide labs compared by test menu, sterility method and turnaround Freedom Diagnostics alternatives for USP <71> sterility, counter-ion, solvent and HGH tests, labs outside the US and other report checks, with sources.
Market data
- The peptide testing market in 2026: 47 labs, their prices, methods, accreditation and rating sites The peptide testing market in 2026: 47 labs by region, report volume, identity methods, accreditation scopes, turnaround, list prices and rating sites.
- Peptide lab comparison tests: what same-batch results from several labs show, and what a fair round needs Peptide lab comparison tests so far: five published same-batch cases, what each can and cannot prove, and how a fair round between labs would work.
Guides that name other labs use each lab’s public website and sample reports, with sources on every page. Spotted an error? Write to contact@hkanalytical.com.