By John Mayers, Peptide Sourcing Expert, 6+ Years. Reviewed by Henry Matt, Editor. Supplier listings and COAs last reviewed: October 14, 2026. FDA and Federal Register information last checked: October 14, 2026.
If you want to buy tirzepatide peptide for research, you’ll find it sold as a lyophilized research-grade powder: a dual GIP/GLP-1 receptor agonist (CAS 2023788-19-2), usually in 10mg to 60mg vials. Listings look alike, but the documentation behind them doesn’t.
We opened every certificate of analysis (COA) we could find, matched lot numbers, and converted prices to cost per milligram across five suppliers. We scored each one on information accessibility, product purity, final cost, and stock availability.
Kylo Peptides came out on top. It publishes ≥99% HPLC purity with LC-MS identity for each lot, a lot-matched COA, and a 30-day guarantee that covers COA mismatches. Members pay $49.98 for 10mg: Kylo membership is a one-time $497 payment with no renewal, takes 50% off every compound for life, and adds a $100 store credit on every membership anniversary. Here are the results of our closer examination of each business.
Where to Buy Tirzepatide Peptide: Top 5 Suppliers at a Glance
| Supplier | Product category and listing | Listed quantity | Current listed price | COA availability | Batch-specific documentation | Important limitations or verification notes |
| Kylo Peptides | Research use only; “GLP 2 (TZ).” | 10 mg, 30 mg | $99.95 (10mg), $249.95 (30mg); members $49.98 / $124.97 | Yes, linked on listing | Lot ID on each vial; COA published against the lot number | LC-MS identity check; refund covers COA mismatch |
| American Peptides | Research use only; “AP-TRZ-2” | 10, 20, 30, 60, 100 mg | $100 (10 mg) | Yes, one per strength | Lot codes, e.g. TIR10-0803 | Purity shown two ways; lab not named |
| Polaris Peptides | Research use only; “Tirzepatide 10mg” | 5, 10, 30, 50, 60 mg | $89 (10 mg) | Yes, Accumark Labs PDF | Lot POL-T10-19, July 2, 2026 | Members-only site |
| Planet Peptide | Research use only; “Tirzepatide-RUO 30MG” | 30 mg | $85 (30 mg) | Yes, Chromate report | Batch TZ30-040925, April 2025 | Report predates listing by 18 months |
| Pacific Research Peptides | Research use only; “Tirzepatide” | 5 to 60 mg | $119 (20 mg) | Listed as “COA pending” | None shown | No CAS, MW, or purity on page |
Quick Picks: Comparing Tirzepatide Suppliers by Documentation
- Kylo Peptides is our #1 pick because it provides HPLC purity testing and refunds if the COA doesn’t match your lot. You rarely find both in one listing, so this combination is uncommon.
- Polaris Peptides has the clearest analytical documentation for a general audience. Its Accumark Labs report, which was signed by two lab employees on July 2, 2026, has a QR code on it.
- American Peptides has the clearest batch identification. Each vial strength has a unique, lot-coded COA.
- Most complete product specifications: Kylo Peptides. CAS, formula, molecular weight, salt form, storage for both states, and both test methods. Planet comes in a close second, with a full amino-acid sequence.
- Clearest published pricing: Polaris Peptides. A six-step volume table takes you from $89 down to $62.30 per vial.
- Most verifiable testing information: Planet Peptide. Its report includes an access code you can verify on the lab’s verification portal. Just match the dates.
How We Evaluated Tirzepatide Suppliers
We ran every listing through our 5-layer check. We use the same supplier checklist for tesamorelin.
Category Specification and Listing Integrity
Does the listing state its product category unambiguously? For this purpose, we looked for clear research-use labeling. All five listings met this requirement. Kylo and Polaris took an additional stance by explicitly describing themselves as non-503A/503B chemical suppliers.
Chemical Specifications and Matching Identification
Have the suppliers provided CAS number, chemical formula, molecular weight, and vial size? Again, consistency was important alongside completeness. Three suppliers provided identical CAS numbers but different molecular weights, so we verified formula consistency.
Analytical Documentation and Verification
Is there an available document specifying analysis methods and outcomes? We inspected each accessible COA and categorized “pending” analyses as unavailable reports.
Lot Specificity
Can a supplied COA be associated with your purchased lot? This step involved matching the batch number on both the COA and the listing.
Unit Price per Gram and Verification of Data Consistency
We calculated prices based on the quoted milligrams. Where available, we also calculated prices based on milligrams confirmed by COAs. We recorded discrepancies in values, along with the requirement for logins and/or portals.
What Matters When Comparing Tirzepatide Listings?
Product Category Comes First
Every listing in this guide is labeled for laboratory research. Check the category label first, then compare research listings with research listings.
Compound Identity and Product Specifications
A clear listing specifies details like CAS 2023788-19-2, the formula, the molecular weight, and the vial size. When the basics are missing, everything that follows is harder to trust.
COA Availability and Batch Matching
Read the report first, then match its lot code to the lot on your vial. A clean COA for a different batch tells you nothing about the vial you bought.
Price and Quantity Differences
$85 for 30 mg and $89 for 10 mg can only be compared when the values are converted to price per milligram. Run the same math before you buy retatrutide peptide.
Supplier Claims Versus Verifiable Evidence
“Third-party tested” is a claim. A downloadable report with a lab name, a date, and a lot code is evidence.
Tirzepatide Peptide Supplier Reviews
1. Kylo Peptides: Research Listing and Documentation Review
Overview
Kylo Peptides sells laboratory research materials and establishes itself as a chemical supplier, outside the 503A and 503B pharmacy rules. Our full Kylo Peptides review covers the wider catalog.
Listing and quantity
Tirzepatide appears as “GLP 2 (TZ)” in 10 mg and 30 mg lyophilized vials, acetate salt. The listing specifies CAS 2023788-19-2, formula C225H348N48O68, and a molecular weight of 4813.45 g/mol.
Price
$99.95 for 10mg and $249.95 for 30mg. Members pay 50% less, $49.98 and $124.97, after a one-time $497 membership. Kylo membership has no renewal fee and does not expire, covers every compound in the catalog, and adds a $100 store credit each year on your join date. Free US shipping starts at $150, the lowest threshold of the five.
COA and lot matching
Each vial carries a printed lot ID, and the COA links straight from the listing with the current lot number and report date.
Testing
Kylo spelled out each of its test methods: HPLC for purity and LC-MS for identity, with mass checked against 4813.45 g/mol. HPLC tells you how clean the sample is. LC-MS confirms it’s the right molecule.
Strengths
Every lot is specified at ≥99% by HPLC, and the 30-day money-back guarantee covers a COA mismatch.
Limitations
Newer listing; lacks a long track record from buyers
Bottom line
Want identity confirmed by mass, plus a refund if the paperwork doesn’t match your vial? Kylo’s 10 mg listing is the place to start.
2. Polaris Peptides: Product Identification and Documentation Review
Overview
Polaris Peptides runs a members-only shop, so you’ll need an account before the tirzepatide listing loads. It’s a small hoop, but worth knowing.
Listing and quantity
Vials come in 5, 10, 30, 50, and 60 mg, lyophilized and vacuum-sealed. Only the lyophilized powder ships.
Price
$89 for 10 mg (down from $99), falling to $62.30 per vial at 20 or more. The 30 mg vial is $225.
COA and lot matching
We opened the Accumark Labs report for lot POL-T10-19. We received it on June 29; it was published on July 2, 2026, signed by a lab manager and a lab director, and includes a QR code check.
Testing
The report shows 99.936% purity by HPLC and 12.68 mg measured in a 10 mg vial, about 27% over label. The listing says “HPLC-MS,” while the report we saw shows the HPLC trace only.
Independent data
On Finnrick, Polaris tirzepatide holds an 80% rating across 16 samples. The most recent test, from September 16, 2026, is marked as a fail.
Bottom line
Polaris had the freshest public report in this group. Worth the sign-up if documentation tops your list.
3. Planet Peptide: Analytical Report and Batch Traceability Review
Overview
Planet Peptide, run by NEOS BIO, LLC, asks visitors to confirm their age and research-only use before the shop opens.
Listing and quantity
Tirzepatide-RUO 30MG sells for $85, down from $125. The listing specifies the full amino-acid sequence, CAS, formula, and a ≥98% purity spec.
COA and lot matching
The Chromate report covers batch TZ30-040925, analyzed April 11, 2025. It includes an access code you can use to check on the lab’s verification page.
Testing
RP-HPLC with UV detection showed 99.984% purity and 35.13 mg in a 30 mg vial, 17.1% over label. HPLC confirmed identity, with no mass spec on this report.
Limitations
The report is about 18 months older than today’s listing, so that current stock may come from a newer batch. The listing specifies 4813.63 g/mol while the COA reports 4813.53. It even shows two different PubChem IDs.
Bottom line
The lowest price per milligram here is about $2.83. Ask which batch ships before you order.
4. American Peptides: Product Specification and Price Transparency Review
Overview
American Peptides sells tirzepatide as “AP-TRZ-2” (catalog code LY3298176) and asks buyers to confirm they’re 21+ and doing in vitro research.
Listing and quantity
Vials come in 10, 20, 30, 60, and 100 mg. 100 mg was sold out when we checked. CAS, formula, and 4813.45 g/mol are all listed.
Price
$100 for 10 mg, or $85 per delivery on subscribe-and-save. Free shipping starts at $300.
COA and lot matching
This is where American Peptides shines. Each strength links to its own lot-coded COA, like TIR10-0803 for the 10 mg vial.
Testing
The listing cites HPLC and mass spectrometry, plus additional testing banners. The testing lab isn’t named, though.
Limitations
Purity shows up as “99.9%” in one spot and “≥99%” in another. The listing shows two different same-day shipping cutoffs, which can confuse buyers. Clarify these details with support.
Bottom line
Strong batch labeling and the widest size range. A solid pick if you buy several strengths.
5. Pacific Research Peptides: Supplier Transparency Review
Overview
Pacific Research Peptides ships tracked orders from Hawaii and keeps its research-only language front and center.
Listing and quantity
Sizes run from 5 mg to 60 mg. The default listing is a 20 mg vial.
Price
$119 for 20 mg, dropping to $113.05 at five vials and $107.10 at ten. A free VIP account takes 25% off the first $1,000 of an eligible first order.
COA and lot matching
The listing showed “COA pending,” with a link to a general lab-report library. We couldn’t match a report to this product’s lot.
Testing
The vendor doesn’t list a purity result, CAS number, molecular weight, or storage temperature yet.
Bottom line
Flexible sizes and fair per-milligram pricing, about $5.95 at 20 mg. Check the report library for a matching lot before you buy.
Tirzepatide Supplier Comparison: What the Listings Actually Establish
Published COAs Versus Lot-Specific Reports
Four of five suppliers published a COA you can open. A report only describes your stock when its lot code matches your vial. Planet’s lot-coded report dates from April 2025, so it may describe an older batch.
Purity Claims Versus Broader Quality Evidence
Both reports we opened showed purity above 99.9%, and neither included a contaminant panel. A 2024 study in the Journal of Medical Internet Research found research-labeled semaglutide vials claiming 99% purity measured between 7.7% and 14.37%.
Price Claims Versus Comparable Listing Information
Per labeled milligram, Planet’s $2.83 undercuts Polaris’s $8.90. Per measured milligram on their COAs, it’s $2.42 versus $7.02.
| Supplier | Verified | Not publicly available | Could not be established |
| Kylo Peptides | CAS, MW, HPLC and LC-MS methods, guarantees | N/A | N/A |
| American Peptides | Lot-coded COA links, CAS, MW | Lab name | Which purity figure applies |
| Polaris Peptides | July 2026 report, lot POL-T10-19, 99.936% | Mass spec data | Whether stock matches that lot |
| Planet Peptide | April 2025 report, 99.984%, verify code | A recent report | Whether stock is batch TZ30-040925 |
| Pacific Research Peptides | Price tiers, vial sizes | COA, purity, CAS, MW | Identity or purity |
How Much Does Tirzepatide Peptide Cost?
Price per labeled milligram is the fair way to compare vials of different sizes. Where a COA reported the measured amount, we also show price per measured milligram. Competitor prices were checked on October 14, 2026, and Kylo prices on October 26, 2026.
| Supplier | Vial | Listed price | Price per labeled mg | Price per COA-measured mg |
| Kylo Peptides | 10mg | $99.95 (members $49.98) | $10.00 (members $5.00) | Not checked |
| Kylo Peptides | 30mg | $249.95 (members $124.97) | $8.33 (members $4.17) | Not checked |
| Polaris Peptides | 10mg | $89 | $8.90 | $7.02 (12.68 mg measured) |
| Planet Peptide | 30mg | $85 | $2.83 | $2.42 (35.13 mg measured) |
| American Peptides | 10mg | $100 | $10.00 | Not reported |
| Pacific Research Peptides | 20mg | $119 | $5.95 | No COA published |
10mg or 30mg: Which Vial Size Should You Buy?
The bigger vial is usually cheaper per milligram. At Kylo, the 30mg vial works out to $8.33 per mg against $10.00 for the 10mg vial, about 17% less. Members pay $4.17 and $5.00 per mg after a one-time $497 membership. Pick 10mg for a first lot check or a small study, and 30mg when you want a whole study to run from one lot.
What Is Tirzepatide Peptide? Dual GIP/GLP-1 Agonist Explained
What Tirzepatide Is
Tirzepatide is a 39-amino-acid peptide that activates two incretin receptors: GIP and GLP-1. For the wider family, see our 2026 roundup of GLP-1 class research peptides.
Tirzepatide Versus Semaglutide
Semaglutide activates GLP-1 receptors only. Tirzepatide activates both GIP and GLP-1, which is why the peptide crowd calls it a “dual agonist.” Our retatrutide vs semaglutide vs tirzepatide breakdown adds the triple-agonist comparison for clarity.
Why Compound Names Do Not Establish Product Equivalence
Two vials can share a name and a CAS number. Their formulation, manufacturing controls, regulatory status, and quality evidence can still differ.
How to Read a Tirzepatide COA Without Overinterpreting It
A COA is your receipt. Here’s how to read one without overinterpreting it.
Identity Testing
Identity tests confirm the molecule matches the label. Mass spec weighs the molecule, so it’s stronger proof of identity.
Purity Testing
Purity is the main compound’s share of what’s in the vial. Buyers often confuse it with the peptide’s net content. The two are different. Picture a glass of orange juice: 99.9% pure juice can still be half a glass. For instance, Polaris’s report showed 99.936% purity and 12.68 mg in a 10 mg vial.
Impurity and Contamination Testing
Contaminant panels each need their own test, so check whether a COA includes them rather than assuming purity covers them.
Batch Number and Report Date
Match the lot on the COA to the lot on your vial. Then compare the report date with the listing date. An old report may describe old stock.
Laboratory Identity and Accreditation
Look for a named lab and a verification code or QR. Enter the access code into the lab’s verification page to confirm the report is real. Check any accreditation claim with the accrediting body directly.
Storage and Stability
Lyophilized tirzepatide is typically stored at −20 °C, sealed and protected from light. Check the storage line on both the listing and the COA, and log the date each vial arrives so its storage history stays tied to its lot.
What a COA Cannot Prove
A COA can’t show how a batch was stored after testing, or whether your vial came from that batch. It simply tests a sample’s purity on a specific date.
Red Flags When Buying Tirzepatide Peptide
COAs That Cannot Be Matched to a Lot
No lot code means no match. Ask the vendor which batch ships before you place the order.
Purity Percentages Used as the Only Quality Claim
One number can’t cover identity, quantity, and contamination. In Finnrick’s public tirzepatide log, 59 of the 200 most recent tests were marked as fails.
Unverifiable Testing or Manufacturing Claims
“Third-party tested” with no lab name or report is a claim you can’t check. It’s less transparent than a report you can open.
Prices Presented Without Comparable Quantities
A low headline price on a small vial can cost more per milligram. Do the per-mg calculation before you compare.
Frequently Asked Questions About Buying Tirzepatide Peptide
Where can I buy tirzepatide peptide for research?
Research suppliers list it as lyophilized powder in vials from 5 mg to 100 mg. Start with the listing’s category label, then open the COA and match its lot code to the vial. These listings are sold for laboratory research only.
Why do tirzepatide listings have different prices?
Vial size, documentation, and testing depth all move the price. In our check, price per labeled milligram ran from about $2.83 to $10. Compare per milligram first, then weigh the paperwork behind each price.
What should I check when reviewing a supplier’s tirzepatide listing?
Check five things: product category, CAS and specs, an openable COA, a lot code that matches your vial, and comparable pricing. That’s the Five-Layer Listing Check in one breath.
How much does tirzepatide peptide cost per mg?
In our check, price per labeled milligram ran from about $2.83 to $10.00. Kylo’s 30mg vial works out to $8.33 per mg at list price and $4.17 per mg for members.
10mg or 30mg: which vial size is better value?
The larger vial is usually cheaper per milligram. Kylo’s 30mg vial costs 249.95(8.33 per mg) against 99.95for10mg(10.00 per mg).
What purity should a tirzepatide COA show?
Most research listings specify ≥98% or ≥99% by HPLC. The two reports we opened showed 99.936% and 99.984%. Purity alone does not confirm identity, so also look for mass spectrometry and a lot number that matches your vial.
How should lyophilized tirzepatide be stored?
Sealed, protected from light, and typically at −20 °C. Follow the storage line on the listing or the COA for your lot.
What is tirzepatide’s CAS number and molecular weight?
CAS 2023788-19-2, formula C225H348N48O68, molecular weight about 4813.45 g/mol. Listings differ slightly in the last decimal (Planet lists 4813.63), so check the figure against the COA.
Final Verdict: Best Place to Buy Tirzepatide Peptide for Research
After reviewing many Tirzepatide reports and ads, we found that Kylo Peptides stands out. Their dedication to quality sets them apart; if the COA doesn’t match your lot, they offer LC-MS identification testing and a return guarantee. Kylo Peptides is the best option for anyone looking for dependable Tirzepatide products because this innovative technique adds an extra layer of confidence.
American Peptides has the clearest batch labeling, whereas Polaris has the most recent public report. Pacific’s listing is awaiting a published COA, while Planet wins on price per milligram and has an earlier report.
We verified the pricing, test procedures, report dates, and lot codes. We couldn’t determine whether certain merchants tested for contamination or whether the current stock matched their claims.
Kylo prevails: it pairs ≥99% HPLC purity and LC-MS identity for each lot with a lot-matched COA and a 30-day guarantee on COA mismatches.
Disclaimer: This guide covers laboratory research materials only. Not for use in diagnostic or therapeutic procedures.
