By Melinda Johnson, Peptide Researcher and Supply Analyst, 5+ Years. Reviewed by Pauline James, Editor. Last updated: October 16, 2026
Want to buy tesamorelin peptide for your lab? Five US suppliers list it right now: Kylo Peptides, American Peptides, True Research Labs, PeakForm Peptides, and Puratek Peptides. All five sell it for laboratory research only, and listed prices run from about $5 to $12 per mg. To choose between them, check each listing for the same five things: clear specs, a certificate of analysis (COA) you can open, a lot number that matches your vial, a stated price, and real company details.
A note on Kylo membership pricing. Kylo’s tesamorelin lists at 99.95 for 10mg (10.00 per mg). Kylo also sells a one-time lifetime membership for $497 that takes 50% off every product in its catalog, which brings tesamorelin to 49.98 (5.00 per mg). On tesamorelin alone, the membership pays for itself at about the 10th vial ($497 ÷ $49.97 saved per vial). It pays back sooner if you buy other Kylo products. Membership is refundable within 30 days if unused, and Kylo ships within the US only. Current terms are on Kylo’s membership page.
Top 5 Tesamorelin Research Suppliers at a Glance
| Supplier | Listed product and vial quantity | Listed price | Public COA or analytical documentation | Documentation or transparency distinction |
| Kylo Peptides | Tesamorelin, 10 mg vial | 99.95 (49.98 member price) | COA PDF on the page; HPLC plus LC-MS identity | Fullest spec sheet: CAS, formula, MW, PubChem ID, counter-ion |
| American Peptides | Tesamorelin, 10 mg (20 mg sold out) | 120.00 (102.00 subscribe) | COA for every lot, plus an SDS | Only listing that shows lot numbers before you buy |
| True Research Labs | Tesamorelin, 10 mg and 20 mg | From $69.00 (range $69 to $104) | Separate purity and endotoxin COAs | Names HPLC, mass spec, and LAL endotoxin testing |
| PeakForm Peptides | Tesamorelin, 5, 10 or 20 mg | $45.00 for 5 mg; bulk to $40.50 | Lot-specific COA by vial size | Clearest bulk pricing tiers |
| Puratek Peptides | TESA (tesamorelin), 10 mg | No price displayed when checked | No COA link found on the listing | “Third-party tested” claim; ask support for documents |
Quick Picks: Which Tesamorelin Supplier Stands Out for Each Criterion?
- Best overall documentation transparency: Kylo Peptides. The listing pairs ≥99% HPLC purity with LC-MS identity testing, a COA PDF, and a 30-day money-back guarantee that covers COA mismatches.
- Best batch traceability: American Peptides. It prints lot numbers on the listing (TESA10-0803 and TESA20-0803). (TESA10-0803 and TESA20-0803).
- Best product specification transparency: Kylo Peptides. It lists the CAS number, formula, molecular weight, PubChem ID, and the acetate counter-ion.
- Best price transparency: PeakForm Peptides. Its bulk table shows the exact per-vial price at 4, 11, and 16+ units.
- Best public analytical-report access: True Research Labs. It posts separate purity and endotoxin COAs and names HPLC, mass spec, and LAL testing.
How We Evaluated Tesamorelin Research Peptide Suppliers
We checked all 5 listings and logged the same fields for each one. We also checked every listed molecular weight against the FDA’s Egrifta label, which puts tesamorelin at 5135.9 daltons.
Product Listing Transparency
Does the listing name the compound, the vial size and the specs? A transparent listing tells you what’s in the vial before checkout: CAS number, formula and molecular weight.
Analytical Documentation
Is there a COA you can open from the listing? Which tests does it report: HPLC for purity, mass spectrometry for identity? A purity figure with a named method counts for more than a bare “99% pure”.
Batch Traceability
Does the report connect to a specific lot? Without a lot ID on the COA, the results could belong to any batch, not necessarily the one your vial came from.
Price and Ordering Transparency
We recorded the listed price, the vial size it belongs to, discounts, and shipping thresholds, then calculated price per mg so different vial sizes can be compared.
Supplier Information
We looked for a company name, contact details, a clear research-use statement, and whether the supplier names its testing lab.
Factors to Consider When Comparing Tesamorelin Suppliers
Shopping around? These five checks will help you shortlist sellers easily.
Product Identification and Specifications
Start with the compound name, vial size and CAS number (218949-48-5 for tesamorelin). A molecular weight near 5136 tells you the spec sheet matches the real compound. Missing specs make every later check harder.
Certificate of Analysis and Analytical Testing
A solid COA names the material, the test methods, the results, and the lab that ran them. HPLC measures purity; mass spectrometry confirms identity. You want both.
Batch or Lot Traceability
Check that the COA’s lot number matches the vial you’ll receive. Most suppliers print the lot on the vial, so you can only match it after delivery. A lot ID shown on the listing lets you check before you pay.
Pricing and Listing Transparency
Compare price per mg, and read the terms behind member, subscription and bulk prices. Ask whether the stated milligrams are total powder or net peptide: net peptide content can be noticeably lower than the powder weight, because the vial also holds the salt counter-ion and residual water.
Supplier and Testing Information
Look for a real company name, contact details, and a stated testing setup. A named lab, with a report you can verify on the lab’s own site, carries the most weight.
The Five Tesamorelin Suppliers Reviewed
Kylo Peptides
Supplier overview: Kylo Peptides (Kylo Research Labs LLC, Sheridan, Wyoming) sells tesamorelin as a lyophilized research material, labelled “Research use only. Not for human or veterinary use.”
Key specifications:
- Tesamorelin, 10 mg vial
- $99.95 one-time; $49.98 with membership
- CAS 218949-48-5, PubChem CID 16137828, molecular weight 5135.86 g/mol
- Kylo states each lot is tested by HPLC for purity with LC-MS identity confirmation, and that certificates are matched to the lot ID printed on the vial
What stands out: The deepest spec block of the five. It goes down to the trans-3-hexenoyl group that distinguishes tesamorelin from native GHRH. Kylo also offers a 30-day money-back guarantee that covers wrong items, broken vials and COA mismatches.
Potential limitations: One size only (10 mg). A $9.99 cold pack is added to every order. Ask for the current lot’s certificate before ordering, and confirm it covers the vial you’ll receive.
Pricing and listing details: $10.00/mg at list price, or $5.00/mg with membership (see the membership note above). Free US shipping over $150.
Documentation review: Match the lot ID on your vial to the lot on the certificate when it arrives. Our full Kylo Peptides review [keep the original article’s link] goes deeper.
American Peptides
Supplier overview: American Peptides ships from Shreveport, Louisiana, sells only to laboratory researchers, and asks buyers to confirm they’re 21+ and qualified researchers.
Key specifications:
- 10 mg in stock; 20 mg sold out
- $120.00 one-time; $102.00 with Subscribe & Save
- ≥99% by HPLC and mass spec, third-party tested
- Lots TESA10-0803 (10 mg) and TESA20-0803 (20 mg); a COA for every lot, plus an SDS
What stands out: The only listing that shows lot numbers before you buy, so the lot check happens before checkout. The spec sheet also gives the full 44-amino-acid sequence and a molecular weight of 5135.86.
Potential limitations: The listing doesn’t name the testing lab, so open the COA PDF to see who issued it.
Pricing and listing details: $12.00/mg, or $10.20/mg on subscription (which renews automatically). Free shipping at $300+.
Documentation review: Lot IDs plus per-lot COAs give a clear paper trail.
True Research Labs
Supplier overview: True Research Labs sells tesamorelin as a lyophilized research peptide and states that it’s sourced from third-party manufacturers, including international suppliers. Contact is by email.
Key specifications:
- 10 mg and 20 mg options
- 1 vial $69.00; 2 vials $126.00; 3 vials $177.00 (10 mg)
- Third-party HPLC and mass spec stated
- Two separate lot reports linked from the listing
What stands out: The lowest list price per mg of the five, and multi-vial savings spelled out in dollars.
Potential limitations: No CAS number, formula, molecular weight or storage conditions on the listing, and no lab named. The reports don’t show which lot is currently shipping.
Pricing and listing details: $6.90/mg for 10 mg; $5.20/mg for 20 mg. Free shipping over $250.
Documentation review: Ask support to confirm that the report’s lot matches the lot you’ll receive.
PeakForm Peptides
Supplier overview: PeakForm Peptides sells tesamorelin (SKU TESA5) as a lyophilized powder for laboratory research only.
Key specifications:
- 5 mg, 10 mg and 20 mg options
- $45.00 for 5 mg; bulk down to $40.50 per vial
- ≥99% by HPLC; tested for purity and weight
- Lot-specific COA by vial size; lot printed on the label
What stands out: The clearest bulk table: 5% off at 4–10 units (42.75),7.5%at11–15(41.63), and 10% at 16+ ($40.50).
Potential limitations: A CAS number appears, but no formula, molecular weight or lab name. The spec table mentions a 15 mg vial that can’t be selected, and only the 5 mg price showed when we checked.
Pricing and listing details: $9.00/mg for 5 mg, or $8.10/mg at the 16+ tier. Free 2-day shipping over $100.
Documentation review: The COA selector ties reports to vial size; match the lot after delivery, since it’s on the label.
Puratek Peptides
Supplier overview: Puratek Peptides lists a 10 mg tesamorelin (“TESA”) research peptide, described as a synthetic GHRH analog for laboratory use.
Key specifications:
- TESA, 10 mg
- Price shown only at checkout
- Described as high-purity and third-party tested, with no percentage or method listed
- No COA link found on the listing
What stands out: Clear lab-use framing. Image file names reference “tesa 10 batch 6”, which suggests batch records exist.
Potential limitations: We couldn’t find a price, purity figure, test method, COA link, CAS number or company address on the listing.
Pricing and listing details: No price displayed before checkout. A 10% first sign-up discount applies site-wide.
Documentation review: The “third-party tested” claim has no linked document. Ask support for the current COA and lot number before ordering.
Which Supplier Fits Which Priority?
No single supplier leads on every point, so match the listing to what matters most to you:
| If you need… | Listings that document it | Why |
|---|---|---|
| Lot numbers before you buy | American Peptides | Lots shown on the listing |
| The most complete spec sheet | Kylo Peptides, American Peptides | CAS, formula, MW and modification (Kylo); full sequence and SDS (American Peptides) |
| The lowest list price per mg | True Research Labs | $6.90/mg (10 mg), $5.20/mg (20 mg) |
| The lowest price per mg with membership | Kylo Peptides | $5.00/mg after a one-time $497 membership |
| Predictable bulk pricing | PeakForm Peptides | Exact per-vial price at each tier |
| A COA mismatch guarantee | Kylo Peptides | 30-day refund covers COA mismatches |
Tesamorelin for Sale: Prices Compared Across 5 Suppliers
| Supplier | Size | Listed price | Per mg | Discounts | Free shipping from |
|---|---|---|---|---|---|
| Kylo Peptides | 10 mg | $99.95 | $10.00 | 50% with 497 membership(5.00/mg) | 150(+9.99 cold pack per order) |
| American Peptides | 10 mg | $120.00 | $12.00 | Subscribe & Save ($10.20/mg) | $300 |
| True Research Labs | 10 mg / 20 mg | $69.00 / $104.00 | $6.90 / $5.20 | Multi-vial | $250 |
| PeakForm Peptides | 5 mg | $45.00 | $9.00 | Bulk to 40.50 (8.10/mg) | $100 |
| Puratek Peptides | 10 mg | Not shown | — | 10% first sign-up | Not shown |
Price per mg is the fair way to compare 5, 10 and 20 mg vials, but it doesn’t measure quality. A low price with no certificate is not cheaper if the material can’t be verified. For a single small order, the shipping threshold matters too: below it, shipping and any cold-pack charge raise the real cost per vial.
What Is Tesamorelin?
Tesamorelin is a synthetic analog of growth hormone-releasing hormone (GHRH). It uses the same 44 amino acids as human GHRH, plus a trans-3-hexenoyl group on the first tyrosine. According to the FDA’s Egrifta label, its formula is C221H366N72O67S, with a molecular weight of 5135.9 daltons.
Native human GHRH(1-44) weighs 5039.8 daltons. The roughly 96-dalton gap is the hexenoyl cap itself. A mass result near 5040 points to plain GHRH, and one near 5136 points to tesamorelin. You can confirm the formula on PubChem.
A compound’s scientific identity is fixed, while a listing is a set of claims the vendor makes about it. Your COA proves the two line up.
What Does Research-Use-Only Tesamorelin Mean?
A research-use-only (RUO) label means the supplier sells the material for lab and analytical work. It is a sales designation and does not indicate FDA approval for human use. In fact, FDA approval, clinical safety, and effectiveness cannot be proven by the COA either.
The COA describes one sample tested in one lab. Approved medicines go through clinical trials and FDA review. Their labels set out how they’re made, stored, and handled. You’ll see the same RUO framing on blends like the Glow peptide stack and the Wolverine stack.
Is Tesamorelin Legal to Buy in the United States?
It depends on the product, the seller, and how it’s intended to be used. Tesamorelin’s FDA-approved drug version is sold as Egrifta, first approved in 2010. However, its research-use listing remains a separate category. The FDA made this clear on August 24, 2026. Its warning letter to Peptide Partners LLC listed tesamorelin among unapproved new drugs because the seller’s website showed the products were meant for human use.
Attorney Audrey Mercer of Sheppard summed it up: “‘Research use only’ disclaimers do not insulate peptide sellers from enforcement.”
Earlier, a March 31, 2026 FDA letter to Gram Peptides covered retatrutide and tirzepatide. Our retatrutide vs semaglutide vs tirzepatide breakdown covers those compounds.
How to Verify a Tesamorelin Certificate of Analysis
Got a COA open? Verify a mass near 5136, a lot ID matching your vial, and a stated net content.
Confirm the Compound Identity
Check that the COA names tesamorelin with a mass near 5136. Mass spec often shows charged ions, so values near 1285 (+4), 1028 (+5), or 857 (+6) match too.
Match the Report to the Product Lot
Find the lot or batch number on the COA. It should match the label on your vial exactly.
Review the Analytical Methods
HPLC measures purity, and mass spec confirms identity. Each answers a different question, so you want both.
Check the Reported Results and Units
Look for a target unit and the exact tested results, like “spec ≥99%, result 99.4%.” Note any net peptide content.
Identify the Testing Laboratory
Look for the lab’s name, report date, and any accreditation, like ISO/IEC 17025. Many labs offer online verification codes.
Understand the Limits of a COA
A COA covers specific tests on one sample. It does not indicate regulatory approval or suitability for human use.
Red Flags to Watch for When Comparing Tesamorelin Suppliers
A few patterns still deserve a second look.
Missing or Unverifiable COAs
The listing says “third-party tested” but links no report. Ask support for the current COA.
Reports That Cannot Be Matched to a Lot
A COA whose lot differs from your vial documents another batch. Ask which lot ships now.
Unsupported Purity Claims
A ≥99% purity claim with no method or lab behind it is hard to check. Of 200 tesamorelin results independent tester Finnrick lists publicly, 83 (41.5%) failed its purity and quantity criteria.
Unclear Laboratory Information
“Independently tested” carries more weight with a lab name attached. A named lab lets you verify reports at the source.
Incomplete Product Specifications
Missing CAS, formula, or molecular weight makes identity checks harder. Conflicting numbers deserve a quick email to support.
Misleading Price Comparisons
A price without its vial size skews per-mg value calculation.
Research Listings With Human-Use Claims
An RUO label next to personal-results claims sends mixed signals, and the FDA has acted on that.
How Tesamorelin Differs From Sermorelin, CJC-1295 and Ipamorelin
These four names often sit next to each other in research catalogs, and the listings are easy to mix up. On paper they’re clearly different:
| Compound | Length | Receptor | Approx. molecular weight |
|---|---|---|---|
| Tesamorelin | 44 amino acids + hexenoyl group | GHRH receptor | 5,136 |
| Sermorelin | 29 amino acids (GHRH 1-29) | GHRH receptor | 3,358 |
| CJC-1295 (no DAC) | 29 amino acids, 4 substitutions | GHRH receptor | 3,368 |
| Ipamorelin | 5 amino acids | Ghrelin receptor (GHS-R1a) | 712 |
If a certificate’s mass doesn’t land near the right figure for the compound you ordered, ask the supplier before using the material. For a fuller comparison of two of these compounds, see our guide to ipamorelin vs sermorelin [link: musculoskeletalkey ipamorelin vs sermorelin article, once live].
Frequently Asked Questions About Buying Tesamorelin Peptide
Is “TESA” the same as tesamorelin?
Yes. “TESA” is a common catalog abbreviation for tesamorelin. Confirm it with the CAS number (218949-48-5) and a molecular weight near 5136.
Where can I find Tesamorelin listed for laboratory research?
US research suppliers like Kylo Peptides, American Peptides, True Research Labs, PeakForm Peptides, and Puratek Peptides list it. Check each page for specs, a CO, and a lot number, and compare prices on the same day. The same approach works for other compounds, as our retatrutide buying guide shows.
What should I check before ordering a research peptide?
Check five things: the compound name and CAS number, the vial size, the supplier, whether a COA is public, and whether the lot matches your vial. If two or more are missing, message support before you order.
How can I check a Tesamorelin certificate of analysis?
Match the COA’s lot number to your vial first. Then confirm a mass near 5136 daltons, an HPLC purity result with a stated limit, and the issuing lab’s name and report date. If the lab offers an online verification code, use it.
Does a high stated purity percentage establish overall product quality?
On its own, no. HPLC purity shows how much of the sample is in the main peak; identity and peptide content require separate tests. Purity also depends on how peaks are read. Finnrick reported one sample revised from 80.151% to 99.395% after a lab excluded a buffer peak.
Why do Tesamorelin research peptide prices differ between suppliers?
Vial size, documentation, and conditions all move the price. At list price, we saw $9.00 to $12.00 per mg, and member, subscription, and bulk deals go lower. Net content matters too, since the stated mg may include salt and water.
What does research-use-only labeling mean?
It means the supplier sells the material for lab and analytical work. The label carries no FDA approval and no evidence for human use. Tesamorelin’s approved medicine is Egrifta, a separate prescription product.
Do subscription and membership prices change the comparison?
Yes. Subscriptions renew automatically at the discounted price; Kylo’s membership is a one-time payment with a break-even of about 10 tesamorelin vials. Compare on what you’ll actually buy. The same approach works for other compounds, as our retatrutide buying guide shows.
Final Verdict: Which Is The Best Place To Buy Tesamorelin Peptide Online?
So where should you buy tesamorelin peptide for research? It depends on what proof matters most to you.
Kylo Peptides has the most detailed spec sheet, LC-MS identity testing, a COA PDF, and a guarantee covering COA mismatches, which is why it tops our list. American Peptides is the go-to for batch traceability, with lot numbers right on the listing. True Research Labs publishes the widest test scope, and PeakForm Peptides makes bulk pricing easy to plan.
Whichever you choose, run checks like a mass near 5136, a matching lot ID, and a stated net content. Ask support for anything missing before you order, save the COA with your records, and keep it in the lab.
Disclaimer: This article compares laboratory research materials. Nothing here is medical advice, and none of these products are for human or veterinary use. Rules for buying tesamorelin depend on the product and how it’s sold, so check current FDA guidance before you order.
