By Eliana Jacob, Peptide Research Analyst, 11+ Years. Fact-checked by Susane Podmore, Editor
Trying to buy tesamorelin for research? Choose a supplier that provides a lot-matched COA for the exact vial you’re getting. Many sites ship the compound as a lyophilized powder, and on paper, they all look the same.
The difference is under the hood: the testing, the COA tied to your specific batch, and what you’re actually paying per mg. Two vials can both say “tesamorelin, 99% pure” and still have very distinct quality. That’s when you count on a real, batch-matched COA. It tells you a lot more about the material than the bare purity number on the website.
We ran the top suppliers through a few checks and found the top 3 you can trust. Use our guide to size up any vendor yourself.
Best Place to Buy Tesamorelin Peptide Online
You can buy tesamorelin from research peptide suppliers that sell it as a lyophilized powder for laboratory use. They differ in testing, COA transparency, pricing, documentation, and how tightly the certificate is tied to your exact vial. Based on our evaluation, 3 suppliers stand out in 2026, and we have reviewed them below.
1. Kylo Peptides: Best for Testing & COA Transparency
Address: 30 N Gould St, Ste R, Sheridan, WY 82801
Phone: +1 833 854 9601
Email: support@kylopeptides.com
If your first question about any vial is “can I see the paperwork,” Kylo Peptides is built for you. The vendor lists Tesamorelin 10mg at $99.95 and ties every order to a lot-matched Certificate of Analysis published on the website.
With lab testing, Kylo goes deeper than most suppliers around. Every batch is checked at 99% or higher purity by HPLC, with LC-MS confirming the compound’s identity. The results come from 3 independent labs: Vanguard Laboratory, Janoshik Analytical, and Freedom Diagnostics. Two of those labs, Janoshik and Freedom Diagnostics, run their own public verification portals.
When we pulled up the listing, the COA library was public and browsable. Kylo ships all materials under clear research-use-only labeling for qualified researchers. If detailed batch documentation and independent testing are your top priorities, Kylo Peptides is a strong place to start.
2. American Peptides: Best Multi-Size Vial Options (10mg, 20mg)
Address: 9742 St. Vincent Ave, Shreveport, LA 71106, USA
Phone: +1 (318) 347-5336
Email: support@americanpeptides.us
Research protocols do not all run at the same scale. Pick American Peptides when you want a choice of vial size. It lists tesamorelin in both 10mg ($120) and 20mg ($190), so you can match the amount of material to the size of your study in a single vial.
Both sizes include their own lot-matched COA, which you can download before checkout: the 10mg is tied to lot TESA10-0803 and the 20mg to lot TESA20-0803. Purity is at 99% or higher by HPLC and mass spec. Volume pricing kicks in as you add units.
One trade-off we found was a really high free shipping threshold. It started at $300, so a single small vial almost always came with hefty shipping charges. Nevertheless, for a lab that wants to stock multiple vial sizes, American Peptides earns a look.
3. Puratek: Best For Researchers On Budget
Address: 1810 E Sahara Ave, Suite #522, Las Vegas, NV 89104
Phone: +1 (702) 518-4855
Email: support@puratekpeptides.com
Small fund or grant money? Puratek offers a low price per vial on its Tesamorelin listing. The compound costs range from $54.95 for 10mg to $104.95 for 20mg, well below what most vendors charge.
The savings stack if you order in bulk: 10% off at five to nine units and 15% off at ten or more, plus another 10% off your first order. Purity is still 99% or higher by HPLC and mass spectrometry, and each batch carries a verified COA, so a lower price doesn’t mean you have to skip the paperwork.
When we checked, the product name on the site read “TESA” rather than the full spelling, which is easy to miss, so keep it in mind to land on the right page. For a lab watching every dollar without dropping testing entirely, Puratek is the value play.
What Is Tesamorelin?
Tesamorelin is a synthetic 44-amino-acid analog of growth-hormone-releasing hormone (GHRH), a signaling peptide. Researchers also refer to it as GRF(1-44) or by its development code, TH9507. In the lab, it is used as a stable tool for GHRH receptor research and is supplied as a lyophilized powder for laboratory use only.
Tesamorelin as a Research Peptide
Chemically, tesamorelin is the full 44-amino-acid sequence of human GHRH with one addition: a trans-3-hexenoyl group attached to the tyrosine at the front of the molecule. That small change blocks DPP-4, the enzyme that degrades natural GHRH in seconds, so the peptide lasts much longer in research settings.
In the literature, Tesamorelin appears as a stable probe for studying GHRH receptor signaling and related metabolic pathways. Because much of that research focuses on lipid handling and visceral fat, tesamorelin often gets grouped with peptides studied for weight and fat-loss research, though those are separate categories.
Tesamorelin vs Other Peptides
Tesamorelin gets compared to a few other growth-hormone-related peptides, and the real differences are structural. Sermorelin is a shorter 29-amino-acid fragment of the same hormone, while tesamorelin carries the full 44 with its stabilizing modification.
CJC-1295 is another GHRH analog, which puts it in the same family as tesamorelin and sermorelin. Ipamorelin belongs to a separate class, the growth hormone secretagogues. People often mention the two together, but they are different types of compounds.
What Should You Look for When Buying Tesamorelin?
When you buy tesamorelin, look for clear product specs, testing tied to the exact batch you are getting, results from an independent lab, and a supplier that is easy to identify and reach.
Clear Product Specifications
A reliable product page states the basics without making you hunt: the product name, amount per vial, physical form, lot or batch information, a research-use designation, storage guidance, and manufacturer or supplier details.
For tesamorelin specifically, you want to see the 44-amino-acid GHRH analog described accurately, along with CAS number 218949-48-5 and the lyophilized-powder form.
Batch-Specific Testing
Consider a COA tied to the exact batch you are buying rather than a generic certificate that could describe any run of the compound. The results then describe the powder heading to your bench, not just any sample of the product.
Independent Laboratory Testing
Third-party testing means an outside lab ran the analysis. An independent analytical result is evidence. Look for a named lab and an identifiable method, ideally one accredited to ISO/IEC 17025, the international standard for testing-lab competence, so you know who ran the test and how.
Supplier Transparency
Trustworthy suppliers make themselves easy to check: a real company name and address, working contact details, product documentation, testing information, clear terms and policies, and plain research-use-only statements. When all of that is visible, you can verify the vendor exists and stands behind what it sells.
How to Read a Tesamorelin COA
A Certificate of Analysis (COA) is the lab report that tells you what is actually in the vial. For tesamorelin, a COA lists the compound and lot, shows HPLC purity and an LC-MS identity result, and includes a verification code you can look up on the testing lab’s site.
Verify a Tesamorelin COA in 60 Seconds
What Is a Certificate of Analysis?
A Certificate of Analysis is a document from a testing lab that records what a sample contains and how pure it is. For research materials, it is the paper trail that backs up a supplier’s claims with actual analytical data. It is the receipt that proves the compound was tested, by whom, and with what result.
What Information Should a Tesamorelin COA Have?
A strong tesamorelin COA carries a handful of fields.
| COA Element | Why It Matters |
| Product name | Identifies the material that was tested |
| Lot number | Connects the results to a specific batch |
| Test date | Shows when the testing was done |
| Laboratory | Identifies who performed the testing |
| Test method | Shows how the material was analyzed |
| Purity result | Provides the reported analytical result |
| Identity test | Helps confirm the compound is what it claims to be |
How to Match a COA to the Product
Matching a COA to your vial takes about a minute: check that the lot number on the vial matches the lot on the COA, the product names agree, the testing date is present, and the reported results line up.
A COA includes a verification code (Janoshik calls it a Task number plus a Unique key), and you can enter that code into the lab’s portal to pull the original record.
Screenshots and PDFs can be edited; the Janoshik verification portal cannot, and Freedom Diagnostics runs a similar public lookup. Match the compound, lot, purity, identity, and date against the lab’s copy, and if anything is off, treat the document as unconfirmed.
Red Flags on a COA
A few things are worth a second look on any COA before you rely on it. These include a missing lot number, no laboratory named, no testing date, a generic certificate not tied to a specific batch, product names that don’t match, a certificate you cannot connect to the item being sold, and a purity claim with no supporting data.
How Is Tesamorelin Purity Tested?
Tesamorelin purity comes down to two lab methods working together: HPLC measures how much of the sample is the target compound, and mass spectrometry confirms the compound is actually tesamorelin.
HPLC Testing
HPLC, or high-performance liquid chromatography, separates the parts of a sample and measures how much of each is present. It is the common method for analyzing peptide purity. The purity percentage it reports is the share of the sample that is the target compound, so a 99% result means the analyzed material was 99% tesamorelin and 1% impurities or residues.
Identity Testing
Identity testing answers the question: is this actually tesamorelin? It employs the Mass spectrometry (MS) method to check the molecular weight of the compound against the expected value, roughly 5135.9 for tesamorelin, confirming the molecule matches.
Measuring how pure a sample is means little if you have not confirmed what the sample even is, which is why identity testing runs right alongside purity.
Purity vs Identity
| Test | Main Question |
| Identity testing | Is this the stated compound? |
| Purity testing | How much of the analyzed material is the target compound? |
Why One Test Doesn’t Tell the Whole Story
Quality evaluation usually involves several checks working together: HPLC for purity, mass spec for identity, and sometimes tests for content, sterility, or endotoxins. Reading them side by side reveals the compound’s complete quality profile.
How to Compare Tesamorelin Suppliers
To compare tesamorelin suppliers, line them up on specs, testing standards, COA availability, batch traceability, company transparency, shipping, and support. Judge every vendor on the same checklist, and the strong ones rise to the top.
Compare Product Specifications
Start with what each page tells you about the compound itself: amount per vial, form, CAS number, and molecular details. Suppliers that publish full specs make comparison easy. When the specs match across vendors, you know you are comparing the same thing.
Compare Testing Standards
Look at how each supplier tests and to what level. HPLC purity plus mass-spec identity is the pairing you want, and a named, accredited lab adds weight. A vendor that lists both methods and the lab behind them is showing its work.
Compare COA Availability
Check whether the COA is available to open before you buy. The best vendors let you open the certificate for the exact lot on the spot, as Kylo does with a public COA library and American Peptides does with downloadable PDFs. Easy access to the COA is a good sign a supplier has nothing to hide.
Compare Batch Traceability
Trace whether each COA ties back to a specific batch, down to the lot number. Lot numbers that match across the vial, the page, and the certificate make traceability real.
Compare Company Transparency
Weigh how much a supplier tells you about itself: company name, address, contact routes, terms, and policies. A vendor that is easy to identify and reach is easier to hold accountable.
Compare Shipping Policies
Compare shipping speed, cost, and free-shipping thresholds, since these change the real price. Kylo offers fast dispatch with free shipping over $150, American ships free over $300, and Puratek sets its own threshold. Small differences add up across repeat orders.
Compare Customer Support
Test how reachable support is before you need it. A supplier that answers questions about testing, handling, or documentation quickly is one you can work with on a reorder. Slow or missing support becomes a friction point later, when something goes wrong.
| Supplier | Product Size | Purity Claim | Third-Party Testing | Batch COA | RUO Labeling | Price |
| Kylo Peptides | 10mg | 99%+ (HPLC + LC-MS) | Yes, four independent labs | Public, lot-matched | Yes | $99.95 |
| American Peptides | 10mg, 20mg | 99%+ (HPLC + MS) | Yes | Downloadable, lot-matched | Yes | $120 / $190 |
| Puratek | 10mg, 20mg | 99%+ (HPLC + MS) | Yes | Verified, per batch | Yes | $54.95 / $104.95 |
How Much Does Tesamorelin Cost?
Tesamorelin runs roughly $55 to $190 a vial depending on the supplier and the pack size. 10mg vials range from $54.95 to $120, depending on testing depth, documentation, and shipping costs.
What Determines Tesamorelin Price?
A few factors set the price on any tesamorelin vial: the quantity you buy, the supplier, the depth of testing, the documentation provided, the manufacturing standards behind it, shipping, and any promotions or quantity discounts.
Testing and paperwork add real costs, so a vial backed by multiple independent labs and a public COA often costs more than a bare listing. Bulk orders and first-order discounts pull the cost down.
Why the Cheapest Tesamorelin Isn’t Always the Best Value
The lowest sticker price does not necessarily mean the best value. Value depends on the price you pay for documentation, testing, and transparency. So, a slightly higher price with a verifiable COA can be the better buy. If you are sourcing other premium peptides, like retatrutide, apply the same concept.
Compare Price Per Milligram
Price per milligram = listed product price divided by the total amount of peptide. Based on that, Puratek’s 10mg works out to about $5.50 per mg, Kylo’s 10mg to $10.00 per mg, and American’s 10mg to $12.00 per mg.
Tesamorelin Vial Sizes: What Should You Compare?
When you compare tesamorelin vial sizes, look at the total amount of research material, the price per mg, the packaging, the documentation, and whether the COA and testing apply to that exact size and batch. Bigger vials usually lower the per-mg cost, which is the main reason to size up.
Smaller vs Larger Vials
A larger vial, like a 20mg, usually lowers the price per mg. A smaller vial can make sense when a study needs less material, and you would rather not have excess sitting in storage. Either way, confirm the COA and testing documentation apply to that specific size and batch.
What Does “Research Use Only” Mean for Tesamorelin?
Research use only (RUO) means the product is sold strictly for laboratory research, not for human or veterinary use. An RUO tesamorelin vial is a reference chemical for the bench. It is not a finished drug product, and the FDA has not reviewed it for any use in people.
Understanding RUO Labeling
RUO labeling tells you the vial is meant for laboratory and analytical work, handled by qualified researchers. It indicates the product’s intended use and regulatory category. Suppliers put it on their websites and on the label. It is the category under which the material is sold.
RUO Products vs Approved Pharmaceutical Products
Tesamorelin’s approved version is the prescription drug Egrifta, which the FDA cleared in 2010 and which Theratechnologies markets for reducing excess abdominal fat in people with HIV-associated lipodystrophy.
Its own FDA label notes it is not a weight-loss treatment. An RUO research vial is a separate product made for lab study and sold without a prescription, so you should never treat the two as the same thing.
Why RUO Labeling Matters When Shopping Online
When you shop online, RUO labeling reminds you that a product sold by a research supplier is not the same as an approved pharmaceutical. A vial on a peptide site has not gone through the approval process a prescription drug has, even when the molecule shares a name. Reading the label keeps your expectations aligned with what you are actually buying.
How to Identify a Reliable Tesamorelin Supplier
A reliable tesamorelin supplier is easy to identify: clear company details, detailed product pages, batch numbers on everything, accessible COAs from labs you can name, honest research-use-only labeling, and responsive support. Run any vendor through that list, and the picture gets clear.
Signs of a Transparent Supplier
The strongest suppliers make trust easy to build. Look for a clear company identity, detailed product pages, visible batch information, accessible COAs, identifiable testing laboratories, clear RUO labeling, transparent policies, and responsive customer support.
The same checklist works for any research peptide, whether you are sourcing compounds studied in women’s health research or sleep research. When most of these boxes are checked, you are dealing with a vendor that stands behind its product.
Warning Signs
A few warning signals are worth a pause before you order. These include no COA available, generic COAs not tied to a batch, missing batch numbers, purity claims that sound too high to be real with nothing to back them, missing company information, thinly documented products, human-use marketing on a research-use-only product, and no clear terms or policies. Any one of these is a cue to slow down and ask the supplier for the lab’s original records.
Common Mistakes When Buying Tesamorelin Online
Most tesamorelin buying mistakes come from trusting a low price, a purity number, or a marketing claim, without checking the paperwork behind it.
Choosing Based Only on Price
Price is an easy number to sort by, but it is only one part of value. A cheaper vial with thin documentation can cost more in redone work than a slightly pricier one with a verifiable COA. Weigh price alongside testing and paperwork.
Trusting a Purity Number Without Checking the COA
A purity figure printed on the website is a claim until a COA backs it up. The number only has meaning when it comes from an analytical result you can trace to a batch and confirm on the lab’s portal. Verify every purity claim with its certificate before you rely on it.
Using a Generic COA
A generic COA describes the analytical results of a sample batch, not the lot your vial belongs to. Look for a lot-matched certificate tied to your exact vial.
Ignoring Batch Numbers
Batch numbers connect a vial to its test results. Skipping past them means you cannot confirm the COA describes your material. A quick lot-number match between the vial and the certificate closes that gap.
Confusing a Supplier’s Marketing Claims With Laboratory Results
Marketing copy and lab data are two different kinds of information. A confident sentence on a product page is a claim, while an independent analytical result is evidence. When they disagree, trust the lab result.
Assuming Every Tesamorelin Product Is the Same
Two vials labeled tesamorelin can differ in size, purity documentation, testing, and traceability. The label name is only a starting point. Compare the specs and the COAs to confirm two vials actually match.
Confusing Research Products With Pharmaceutical Products
A research-use-only vial and the approved prescription drug share a molecule, but they come through different channels, carry different labeling, and serve different purposes. Most buyers mix the two up and end up with the wrong product.
Tesamorelin Supplier Comparison Table
| Supplier | Product | Size | Price | Purity | Third-Party Testing | COA | RUO Label | Key Differentiator |
| Kylo | Tesamorelin | 10mg | $99.95 | 99%+ (HPLC + LC-MS) | 3 independent labs | Public, lot-matched | Yes | COA transparency |
| American Peptides | Tesamorelin | 10mg, 20mg | $120 / $190 | 99%+ (HPLC + MS) | Yes | Downloadable, lot-matched | Yes | Multiple vial sizes |
| Puratek Peptides | TESA | 10mg, 20mg | $54.95 / $104.95 | 99%+ (HPLC + MS) | Yes | Verified, per batch | Yes | Lowest price |
Best Tesamorelin Supplier for COA Transparency
Kylo Peptides publishes a browsable COA library, matches every certificate to the exact lot on your vial, and tests each batch across 3 independent labs, two of which offer public verification.
Best Tesamorelin Supplier for Product Documentation
American Peptides is the pick for documentation you can pull before checkout. It posts downloadable, lot-matched COA PDFs for both the 10mg and 20mg sizes, backed by full specs and a verification page.
Best Tesamorelin Supplier for Price Comparison
Puratek wins on price. At $54.95 for 10mg and $104.95 for 20mg, with bulk discounts and a first-order deal on top, it gives the lowest cost per mg in this guide while still shipping a verified COA per batch.
Frequently Asked Questions
Where can I buy tesamorelin for research?
You can buy tesamorelin from research peptide suppliers that sell it as a lyophilized powder for laboratory use. Three solid options are Kylo Peptides for COA transparency, American Peptides for multiple vial sizes, and Puratek for the lowest price. Compare each on testing, documentation, and price before ordering.
How much does tesamorelin cost?
Tesamorelin generally costs about $55 to $190 per vial, depending on the supplier and size. In this guide, 10mg vials range from $54.95 at Puratek to $99.95 at Kylo and $120 at American Peptides, while 20mg vials run higher. Testing depth, documentation, and shipping all move the price.
What should I look for in a tesamorelin supplier?
Look for clear product specs, a lot-matched COA tied to your exact batch, independent third-party testing from a named lab, and a transparent company with real contact details and research-use-only labeling. When a supplier shows all four, most sourcing risk drops away.
How do I verify a tesamorelin COA?
Match the lot number on the vial to the lot on the COA, confirm the product name and testing date, and check the reported purity and identity results. Then take the verification code on the certificate and look it up on the testing lab’s own portal, such as Janoshik’s, since a portal record cannot be edited the way a PDF can.
What purity should I look for when buying tesamorelin?
Look for 99% or higher purity by HPLC, paired with a mass-spec identity result that confirms the compound is tesamorelin. Purity alone tells you how much of the sample is the target; identity tells you it is the right molecule. You want both, backed by a verifiable COA.
How can I tell whether a tesamorelin supplier is legitimate?
A legitimate supplier publishes clear company details, batch numbers, accessible COAs from named labs, and honest research-use-only labeling, with responsive support. Signals worth a pause include missing COAs, generic certificates, no batch numbers, and human-use marketing on a research product. Run any vendor through that checklist before you buy.
Final Thoughts on Buying Tesamorelin Peptide For Research
Buying tesamorelin means matching the compound and vial size to your study, insisting on a lot-matched COA you can verify on the lab’s portal, and choosing a supplier whose transparency you can confirm. Do that, and the widespread listings stop being confusing and start being easy to sort.
If testing depth is your priority, Kylo Peptides is the natural starting point. If you want a choice of vial size with the COA in hand first, American Peptides is a good fit. If price per mg leads your decision, Puratek is the value play. Whichever you choose, trust the verifiable paperwork over the loudest claim.
Disclaimer: This guide is written for laboratory and procurement buyers sourcing research-use-only material. Nothing here is medical advice, a usage protocol, or a recommendation for human or veterinary use.
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