Independent testing verifies what is actually inside the vial you purchased. This guide covers the four quality layers a laboratory can measure — identity, purity, quantity, and contamination — what each one costs, how long it takes, and what a certificate does not tell you.
HPLC purity across brands ranges from 85% to 99.5% for the same compound. Platform average sits at 99.5% — but that average reflects tests people chose to submit, which skews high. Untested vials are an unknown, not an average.
02
Underdosing
Quantity verification reveals whether a vial holds the labelled amount. A vial can be over 99% pure and still contain well under its label claim — purity and quantity are separate measurements.
03
Contamination
Endotoxin screening detects bacterial cell-wall fragments that cause fever and inflammatory reactions. Routine HPLC detects none of this — it is a different test entirely.
04
Identity substitution
Mass spectrometry confirms molecular identity. A chromatographically pure sample can be the wrong compound, cleanly synthesised.
The four quality layers
What labs actually sell
Laboratories bundle identity, purity and quantity into a base panel, then sell contamination screening as add-ons. A purity figure alone answers one of four questions.
Layer
What it answers
Method
Typical cost
Identity
Is this the right compound?
MS / LC-MS against a reference standard
bundled in base panel
Purity
What fraction is the target compound?
HPLC area-percent (UV, DAD or MS detection)
bundled in base panel
Quantity
How many mg are actually in the vial?
calibrated assay / net peptide content
bundled, or from +$25
Base panel — all three
—
—
$150–$300
Endotoxin
Bacterial pyrogens present?
LAL / USP <85>
$150–$300
Sterility
Viable organisms present?
PCR screen or USP <71> culture
$150–$300
Heavy metals
As, Cd, Cr, Hg, Pb
ICP-MS
$100–$250
Bundled safety package
base + endotoxin + sterility (+ metals)
—
$550–$700
Four things a purity percentage does not tell you
Read this before you read a COA
01
Whether it is the right compound.
Purity is a chromatographic area-percent: it measures how much of the sample is one dominant peak, not which molecule that peak is. Identity requires mass spectrometry against a reference standard. A COA showing a purity figure with no identity method named has answered half the question.
02
How much peptide is in the vial.
Ask what "mg" means on the certificate. Total powder weight, calibrated assay, and net peptide content excluding water, salts and counterions are three different numbers from the same vial. Only the last tells you how much active compound you have.
03
Whether it is sterile — and which sterility test was run.
Two very different tests share the name. A PCR screen detects microbial DNA and returns in 48–72 hours. A compendial USP <71> culture requires a minimum of 14–15 days and cannot be rushed, because it waits for organisms to grow. A laboratory advertising 48-hour turnaround is not running USP <71>. Both are legitimate; they answer different questions with different confidence.
04
Whether it is endotoxin-free.
Endotoxins are bacterial cell-wall fragments that survive sterilisation. Sterile and endotoxin-free are not the same claim. Endotoxin requires a separate LAL assay, and most labs require an additional vial for it.
On verification: a QR code or portal lookup confirms the report is genuine and unaltered. It does not confirm that the vial tested was representative of the batch you received. Verification defeats PDF tampering; it does not prove sampling integrity.
How to get your peptides tested
5-step process
01
Choose a laboratory
Browse the testing laboratories directory, sorted by published test volume. 11 of 29 labs operate a public COA-lookup portal, meaning any result can be independently confirmed by a third party. Match the lab to the question: a routine purity check and a full injection-safety panel are different purchases.
02
Confirm scope, method and price in writing
Only 9 laboratories publish public numeric pricing — most quote on request. Before shipping, confirm: which identity method is used, whether quantity means net peptide content, how many vials the order consumes, and the current price. A missing public price is not evidence of a high price, but it is a reason to get a written quote.
03
Prepare and ship your sample
Most labs need 1–5 mg of material. Ship in the original sealed vial where possible. Add-ons consume extra vials — endotoxin and sterility each typically require one additional vial, though some labs cover both from a single extra. Compendial sterility can require 4 to 20 vials depending on batch size.
04
Receive your Certificate of Analysis
Delivered as PDF, usually by email or portal. Turnaround runs from 24 hours to 15 days depending on the tests ordered — see how long it takes. Advertised turnaround is analysis time only; it excludes shipping, customs and queue.
05
Submit your results to the database
Upload through the lab test submission form. Published results feed shop trust scores and let other buyers compare brands. Four fields are required: peptide name, brand, purity percentage, and testing laboratory. Endotoxin levels, batch numbers and container details are optional but raise the value of the submission considerably.
How much does testing cost?
Published rates, 9 laboratories
Prices rose sharply through 2025–26. A base panel runs $150–$300 at US laboratories. Adding endotoxin, sterility and metals can more than double the bill.
Category
Range
Notes
Base panel, single compound (US labs)
$150–$300
identity + purity + quantity
Base panel, catalogue-priced
$215–$450
varies by compound complexity
Blends / multi-component
$320–$800
each component resolved separately
Endotoxin
$150–$300
usually requires an extra vial
Sterility
$150–$300
PCR screen vs USP <71> — different tests
Heavy metals
$100–$250
confirm which elements are covered
Bundled safety package
$550–$700
3–4 vials typically required
Rush / expedited
up to +$500
can exceed the base test price
Prices verified from official laboratory sites on 22 July 2026, across 9 laboratories publishing public rates. Most labs quote on request. Confirm current pricing before shipping.
European pricing is quoted in local currency and does not map cleanly to USD — Polish laboratory rates start around 599 PLN for peptide analysis, rising for growth-hormone and IGF work. Cross-border shipping, customs and return postage should be costed in separately.
Why the cheapest number is rarely the best value
Base prices are not comparable line-for-line. Laboratories differ on:
whether identity is confirmed by LC-MS or only by retention time against a standard
whether net peptide content is included or charged as an add-on
whether raw chromatograms are supplied or held back
how many vials the order consumes
whether the result is quantitative (mg/vial) or qualitative (present / not present)
A $150 qualitative identification and a $300 quantitative assay with raw data are not the same product. Compare what is in the panel.
How long does it take?
3 turnaround tiers
Advertised turnaround is analysis time. It excludes shipping, customs clearance, laboratory queue, and repeat runs.
Tier
Typical
What sets it
Rapid chromatography
24–72 hours
HPLC/MS purity, identity, quantitation
Standard
3–10 business days
most catalogue and package testing
Culture-based sterility
14–15 days minimum
USP <71> waits for growth — cannot be rushed
If a quoted turnaround for a "full safety panel" is under two weeks, the sterility component is a rapid PCR screen rather than a compendial culture. That is a legitimate choice — but know which one you bought.
Test counts reflect results submitted to Peptigrity only — not a laboratory's total commercial volume. A high count means the lab is widely used by this community, not that it is more accurate.
A note on accreditation
Peptigrity does not accredit, endorse, or verify any laboratory. Listings are aggregated from community-submitted test data.
Accreditation claims in this sector need reading carefully:
ISO/IEC 17025 is scope-specific. A laboratory can hold accreditation while the particular peptide method in question sits outside the accredited scope. Ask for the current signed scope document, not just the certificate.
Some claims are in progress. Several labs describe ISO 17025 as pending or underway. That is not the same as accredited.
Other credentials are not analytical accreditation. A DEA licence, CLIA number, FDA registration, or business rating each mean something specific — none of them is ISO 17025.
The most widely used laboratories in this space publish no ISO/IEC 17025 statement at all. That does not make their work unreliable; it means accreditation is not the axis on which this market competes. Verifiability, method disclosure and raw-data access are the practical signals.
Verify credentials directly with the laboratory before submitting samples.
What to do with your results
After receiving your Certificate of Analysis, submit the results to the lab tests database. Published results contribute to trust scores for peptide shops, help buyers compare brands, and build a transparent quality record for the market.
Currently 10,489 tests are on file from 29 laboratories.
Each submission requires four fields: peptide name, brand name, purity percentage, and testing laboratory. Endotoxin levels, batch numbers and container descriptions are optional — and are the fields that make a submission genuinely useful to the next reader.
Common questions
6 answers
How much does peptide testing cost in 2026?
A base panel covering identity, purity and quantity runs $150-$300 at US laboratories. Contamination add-ons - endotoxin, sterility, heavy metals - run $150-$300, $150-$300 and $100-$250 respectively. Bundled safety packages run $550-$700.
How long does peptide testing take?
Rapid chromatography returns in 24-72 hours. Standard turnaround is 3-10 business days. Compendial USP <71> sterility requires a minimum of 14-15 days because it is culture-based.
Does a high purity percentage mean the peptide is safe?
No. Purity measures the proportion of the sample that is the dominant compound. It does not confirm identity, quantity, sterility, endotoxin levels, or heavy metals - each requires a separate test.
What is the difference between PCR sterility and USP <71>?
A PCR screen detects microbial DNA and returns in 48-72 hours. USP <71> is a compendial culture test requiring 14-15 days minimum. They answer different questions at different confidence levels.
How much sample does a laboratory need?
Most require 1-5 mg. Endotoxin and sterility typically require an additional vial each. Compendial sterility can require 4-20 vials depending on batch size.
Are these laboratories affiliated with Peptigrity?
No. There is no business relationship, sponsorship, or affiliate agreement between Peptigrity and any laboratory listed.
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