Written by Dallas Leal and fact-checked by Dallas Leal
Where to buy Tesamorelin peptide comes down to which supplier lets you read the paperwork first. Five stock it right now: Kylo Peptides, American Peptides, Puratek Peptides, Caliber Labs, and PeakForm Peptides. The Tesamorelin-for-sale listings among them span more than a threefold price range, for material that looks identical on screen.
Two of the five let us open and read a lot-specific Tesamorelin certificate in full before paying anything. That one difference separates them more cleanly than any purity figure printed on a product page.
We read each current product page and its published testing documentation, comparing six things: product transparency, testing method, lot-specific certificate, price per milligram, vial sizes, and what each company discloses about itself. All five sell Tesamorelin as laboratory research material, not for human or veterinary use.
Vendor Verification Comparison
All five sell lyophilized Tesamorelin and claim at least 99% purity. Differences show up in vial size, price per milligram, and what each publishes.
| Supplier | Vial Sizes | Price | Purity | Identity Testing | COA |
| Kylo Peptides | 10 mg | $99.95 ($49.98 member) | ≥99% HPLC | LC-MS | Published library |
| American Peptides | 10, 20 mg | $120 / $190 | 99.9% stated | HPLC + mass spec | On product page |
| Puratek Peptides | 10, 20 mg | $54.95 / $104.95 | ≥99.0% HPLC | HPLC + mass spec | Library shows no Tesamorelin |
| Caliber Labs | 10 mg | $119.99 | ≥99.1% (99.12% on COA) | LC-MS | Public, lot H0GR4E |
| PeakForm Peptides | 5, 10, 20 mg | $45 / $80 / $145 | ≥99% HPLC | LC-MS | One per vial size |
Where you buy Tesamorelin peptide decides the per-milligram cost, and the cheapest sticker is not the cheapest material. PeakForm’s $45 listing works out dearer per milligram than Puratek’s $104.95 one.
What Should You Check Before Buying Tesamorelin Peptide?
Five checks separate a Tesamorelin research peptide listing you can verify from one you cannot. Run them ahead of any price comparison, because a cheaper vial with no matching paperwork is a different product from a documented one. Each takes under a minute on the supplier’s own site.
Check the Exact Vial Size and Quantity
These five suppliers sell Tesamorelin in 5 mg, 10 mg, and 20 mg vials. A price means nothing until you know the milligrams behind it. Read the size off the listing itself.
Look for a Lot-Specific COA
A useful certificate includes four things: the lot number, the product name, the testing date, and results for the vial you are buying. A generic company-wide certificate describes some other vial.
Check Both Purity and Identity Testing
HPLC measures purity, reporting how much of the material is the target compound. A separate test, usually LC-MS, confirms identity. A sample can be 99% pure and still be the wrong peptide, so a complete certificate carries both.
Identify the Testing Laboratory
Look for the laboratory’s name. A bare “third-party tested” badge tells you nothing about who ran the work. An accession or reference number helps too, since it lets you take the result back to the issuing lab.
Review What the Supplier Discloses
Before you buy Tesamorelin peptide, note what the site publishes: specifications, testing documentation, company identity and contact details, research-use labeling, and shipping terms. Gaps here are informative. A supplier listing a phone number and business hours is easier to hold to account.
Where to Buy Tesamorelin Online?
We assess each of the five Tesamorelin suppliers on the same factual criteria: format and price, purity specification and test methods, certificate status, the testing laboratory, and research-use and shipping terms. Each entry sets out what that supplier publishes. Where a company states nothing, we record it as not published.
1. Kylo Peptides
One size, two price tiers. Kylo Peptides sells Tesamorelin in a single 10 mg vial, and its listed price carries a second tier beneath it. The standard price is $99.95, or $10.00 per mg. Members pay $49.98, which halves that to $5.00 per mg.
Read the condition before comparing that rate against anything else. It requires a one-time $497 lifetime membership that gives 50% off the catalog, so the savings only apply if you buy repeatedly. Multi-vial discounts sit alongside it at 5% on two vials and 10% on three.
The purity standard is at least 99% by HPLC, with identity confirmed by LC-MS. Kylo releases each order against a certificate matched to the lot number printed on the vial. We check its certificate library, which includes reports from four independent laboratories: Janoshik, Freedom Diagnostics, Vanguard, and Optiq. The library is where you see that full roster against a given lot.
Material is designated for research use only and dispatches within 24 hours. Kylo suits a repeat buyer who will actually use the membership.
2. American Peptides
Highest stated purity figure. At 99.9%, American Peptides posts the highest purity figure of the five, above its own site-wide floor of at least 99% by HPLC and mass spectrometry. Tesamorelin comes in two sizes, 10 mg at $120 and 20 mg at $190. Those work out to $12.00 and $9.50 per mg.
The listing promises a lot-matched certificate on every vial, downloadable from the product page, and adds endotoxin testing and sterility verification. No testing laboratory appears anywhere on the page, so the highest purity figure here carries the least information about who produced it.
Ordering terms are clear: free shipping over $300, same-day dispatch before 2 PM EST, and USA sourcing and shipping. Everything carries research-use-only labeling. Visit American Peptides for the 20 mg vial and documented endotoxin testing.
3. Puratek Peptides
Lowest listed price per mg. Puratek Peptides lists 10 mg at $54.95 and 20 mg at $104.95, which works out to $5.50 and $5.25 per mg. That is roughly half what Caliber and American Peptides charge per milligram.
Its stated purity is at least 99.0% by HPLC, with mass spectrometry also given as a method. The company publishes plenty about itself: a support email, a phone line at 702-518-4855, business hours, free shipping on orders over $150, and bulk tiers of 10% and 15%.
Puratek runs a batch-specific certificate library, but when we checked, it showed certificates only for Melanotan-2, Melanotan-1, and GLP-3R. No Tesamorelin entry, no laboratory named, so the cheapest per-mg listing currently shows the least published evidence for this compound.
Everything is labeled for research use only. Ask for the Tesamorelin certificate before you order.
4. Caliber Labs
COA is public before the price. Caliber Labs inverts the usual order. Its storefront asks you to confirm you are 21 or over and a qualified researcher before you see anything. Yet, its Tesamorelin certificate sits on the open web, indexed and readable by anyone.
The product is a 10 mg lyophilized vial in a 3 ml container for $119.99 ($12.00 per mg), with a buy-two-get-one-free offer and free standard shipping over $250. The page states at least 99.1% purity. A verification panel branded AuthentiChain reads “Passed” for lot H0GR4E, tested 17 September 2026.
We opened the underlying certificate for that same lot. It reports 99.12% purity by HPLC-UV, identity confirmed by LC-MS, and net content of 11.09 mg against a 10 mg label, tested and reported on 15 September by Freedom Diagnostics. The certificate and the page have different dates, which is worth noting when you match one to the other.
The vial is designated for research use only. Read the certificate, then decide whether the gated storefront is worth it.
5. PeakForm Peptides
A certificate per vial size. PeakForm Peptides publishes a separate certificate for each of its three Tesamorelin sizes, the only supplier here that does. Those sizes are also the widest spread: 5 mg at $45, 10 mg at $80, and 20 mg at $145, or $9.00 down to $7.25 per mg.
Every lot undergoes purity, weight, and endotoxin testing, with a stated floor of at least 99% purity by HPLC. We downloaded the 5 mg certificate and read it in full. It records lot P20260412, 99.80% purity by HPLC-UV, identity confirmed by LC-MS, and net content of 4.87 mg against a 5 mg label.
The same certificate reports endotoxin testing by LAL assay in line with USP General Chapter 85, with two replicates passing at 0.05 EU/mL sensitivity. Freedom Diagnostics ran it.
Free two-day US shipping starts at $100, bulk tiers apply to the 5 mg size, and every vial is labeled research use only. Get PeakForm when the certificate must match the exact vial size.
Tesamorelin vs. Retatrutide, Tirzepatide, and Semaglutide
Researchers sourcing Tesamorelin research peptide often hold quotes for these other compounds at the same time. They belong to different mechanistic classes, so the documentation you should demand differs too. Compound identity, product format, and paperwork are where the differences sit.
Tesamorelin vs. Retatrutide
Tesamorelin is a stabilized analog of human GHRH acting at the growth hormone-releasing hormone receptor. Retatrutide is a triple agonist at the GIP, GLP-1, and glucagon receptors, so the two answer different research questions. Both need identity confirmation, since a purity figure cannot tell one peptide from another.
Tesamorelin vs. Tirzepatide
Tirzepatide is a dual GLP-1 and GIP receptor agonist, in the incretin class alongside semaglutide. Tesamorelin sits outside that class, and suppliers quote incretin analogs in smaller increments, so per-mg comparisons rarely translate.
Tesamorelin vs. Semaglutide
Semaglutide is a GLP-1 receptor agonist, a single-target compound with a different molecular weight and a different expected mass on an LC-MS report. If a vendor names its testing laboratory for one compound and leaves it blank for another, treat the unnamed one as the less verifiable purchase.
What Should You Compare When Buying Any of These Peptides?
- Exact compound and confirmed identity
- Vial quantity in milligrams
- Price per mg, calculated
- Purity result and its method
- Lot-specific certificate for that vial
- Named testing laboratory
- Full product documentation
- Clear research-use labelling
Tesamorelin Price Per Mg: How to Compare Different Vial Sizes
Tesamorelin price per mg is the figure that makes five different listings comparable. On listed prices, the same compound runs from $5.25 to $12.00 per milligram across these suppliers, and discounts move several of them further. Two published certificates sharpen the calculation again.
5 mg vs. 10 mg vs. 20 mg
PeakForm is the clean worked example, selling all three sizes. At $45, $80, and $145, the per-mg cost falls from $9.00 to $8.00 to $7.25. The 20 mg vial costs a little over three times as much as the 5 mg one and contains four times as much.
How to Calculate Price Per Mg
Take the listed price and split it across the total milligrams. Puratek’s 20 mg at $104.95 gives $5.25 per mg, the lowest listed figure here, while Caliber’s 10 mg at $119.99 gives $12.00, which American Peptides matches. Where a certificate reports net content, run the sum again against that figure.
When Bulk Pricing Changes the Comparison
Discount structures reshuffle the order. Kylo’s member rate takes it to $5.00 per mg, below every listed figure here, but needs the $497 membership first. Caliber’s buy-two-get-one-free drops a three-vial order to roughly $8.00 per mg.
Don’t Forget Shipping Costs
Free-shipping thresholds vary widely, from PeakForm at $100 to American Peptides at $300, and a single vial can decide whether you pay postage.
How to Read a Tesamorelin COA Before You Buy
A Tesamorelin COA only helps if you read it against the vial in front of you. The two published certificates, from Caliber Labs and PeakForm’s COA library, show what a complete one contains. A certificate either describes your vial or somebody else’s, and these six fields tell you which.
Product Name and Lot Number
The certificate should name the compound and a single lot. Caliber’s reads Tesamorelin with lot H0GR4E; PeakForm’s 5 mg reads P20260412. If either is missing, the document describes no particular vial.
Purity Result
Look for a percentage and the method behind it. Caliber reports 99.12% by HPLC-UV; PeakForm reports 99.80% by the same method. A figure with no stated method is only a claim.
Identity Result
Both certificates confirm identity by LC-MS, establishing the material as Tesamorelin. Some certificates omit it entirely and report purity alone.
Testing Laboratory
Freedom Diagnostics signed both certificates. A named laboratory, ideally with an accession number like PeakForm’s 2609119006, makes results traceable beyond the supplier’s website.
Test Date
PeakForm’s 5 mg sample arrived on 11 September 2026 and was reported the next day. Caliber’s was tested and reported on 15 September, though its page shows 17 September. Dates that disagree deserve a question.
Does the COA Actually Match the Product?
Match the lot, product name, and quantity. Then compare net content against the label: PeakForm’s 5 mg reports 4.87 mg, Caliber’s 10 mg reports 11.09 mg.
What Does “99%+ Purity” Actually Tell You About Tesamorelin?
A complete Tesamorelin certificate measures four separate things, and purity is only the first. HPLC purity reports what proportion of the material in the vial is the target compound. It says nothing at all about which compound that actually is.
Identity is the second. LC-MS confirms the molecule itself, which is why purity alone settles very little. The method behind each number also decides what it means: HPLC separates the sample and measures the peak, and the same figure produced by a different technique, or by no stated technique, is not comparable.
Across these five suppliers, the stated specifications run from at least 99.0% to 99.9%. The two figures we verified against published certificates were 99.12% and 99.80%. Those are measurements from real lots, and they fall within the range every supplier advertises.
Net content is the third, and purity never touches it. PeakForm’s 5 mg certificate reports 4.87 mg while Caliber’s 10 mg reports 11.09 mg, so two vials can share a purity grade and still hold quite different amounts of peptide. Endotoxin limits are the fourth, covering contamination that purity testing does not assess.
What Can You Learn About a Supplier Before You Place an Order?
Tesamorelin suppliers reveal quite a lot before you order, and all of it for free. Every one publishes a different amount, and the gaps read as clearly as the disclosures. You can see nearly everything you need before you spend a dime.
Product Page Transparency
Check that specifications, vial size, compound identity, and availability appear on the listing. PeakForm names three sizes and a SKU. Kylo publishes CAS number, molecular weight, and formula.
COA Accessibility
Certificates come in four forms: a public library, a per-product download, a lot-specific file, or a document sent on request. Caliber’s is publicly indexed, PeakForm’s is one per size, and Puratek’s library holds none for this compound.
Company Information
Contact details are the cheapest trust signal a supplier can offer. Puratek publishes an email, phone number, and business hours. Caliber’s storefront requires researcher confirmation, so its pricing never reaches a search index.
Testing Information
Read methods, laboratory, and lot details together. Three of these five name a laboratory. American Peptides and Puratek publish specifications without saying who ran the test.
Shipping and Ordering Policies
Thresholds, dispatch windows, and return terms all appear up front. Kylo dispatches within 24 hours with a 30-day money-back window.
Research-Use Labeling
Every supplier in this comparison labels its material for research use only. FDA guidance states such products must be prominently labeled and kept separate from diagnostic or clinical use.
What Are the Red Flags When Buying Tesamorelin Peptide?
Warning signs among Tesamorelin suppliers center on documentation, and none require expertise to spot. Weak listings tend to share the same handful of gaps. Any one of these signs should slow a purchase down long enough to ask a question.
- No certificate of analysis offered at any point
- A generic certificate with no lot or batch number
- A certificate whose lot does not match the vial you receive
- An unnamed testing laboratory behind a “third-party tested” badge
- A purity claim with no supporting document
- Missing vial quantity, so price per mg cannot be worked out
- Incomplete product specifications on the listing
- Documentation dated long before the lot on sale
- Unclear company identity or no contact route
- Ambiguous research-use labelling
- Large claims carried by very little paperwork
Two of these show up among the five suppliers here: a certificate library holding no entry for Tesamorelin, and a purity specification with no named laboratory behind it. Neither is an error, though each leaves you trusting the seller. Ask for the lot-specific document before you buy Tesamorelin peptide, and treat a refusal as an answer.
Research Tesamorelin vs. Pharmaceutical Tesamorelin: What Is the Difference?
Research use only Tesamorelin and the prescription medicine are two different products sharing a molecule. One is a licensed drug with an approved label; the other is a laboratory reference material. They move through different channels and have entirely different legal statuses.
Research-Supplier Products
Suppliers label research-grade Tesamorelin for laboratory use only. Its documentation is the supplier’s own: a certificate of analysis, purity and identity results, and lot records. It carries no approved indication.
Pharmaceutical Tesamorelin
The active ingredient is approved as EGRIFTA, cleared by the FDA in 2010 for reducing excess abdominal fat in patients with HIV-associated lipodystrophy. The label states it is not indicated for weight-loss management. Its evidence base comes from controlled phase 3 trials.
Why the Two Should Not Be Treated as Interchangeable
Different category, different labeling, different purchasing route. A research vial does not substitute for a prescribed medicine, and a certificate of analysis does not equal regulatory approval. Treating one as the other misreads what each document certifies.
FAQs About Buying Tesamorelin Peptide
Can two Tesamorelin products with the same vial size have different prices?
Yes, and the gap can be wide. Two 10 mg vials here differ by $65. What varies is testing depth, documentation published, and shipping thresholds.
Why might two Tesamorelin COAs show different purity percentages?
Because they describe different lots, and a specification is not a measurement. A supplier promising “at least 99%” states a floor; the certificate reports what one batch returned. The same lab can issue 99.12% for one lot and 99.80% for another.
Can one supplier have multiple Tesamorelin batches at the same time?
Yes. A supplier can hold several lots at once, and different vial sizes often carry their own lots and test dates, which is why PeakForm publishes a separate certificate for each of its three sizes. Match the number printed on your vial against the certificate, because the newest one on the site may not be yours.
Why does the testing laboratory matter when comparing suppliers?
A named laboratory gives you somewhere to take the question. Kylo’s certificate library shows the format, with reports attributed to four named labs you can contact. When a certificate includes an accession number, the lab can retrieve the record using it.
Does a larger Tesamorelin vial always offer better value?
Usually, though not automatically. PeakForm’s per-mg cost falls steadily from 5 mg to 20 mg. Measured content can undercut that: its 5 mg vial holds 4.87 mg, so the true cost per milligram runs above the label figure.
What information should I keep from a supplier after purchasing?
Save the lot number, a downloaded copy of the certificate as it appeared that day, and your order record. Certificates get replaced when new lots arrive, and the page you bought from may not be the one you see later on.
Final Thoughts
Deciding where to buy Tesamorelin peptide comes down to what each supplier shows you before you pay. The documentation behind the listing is the thing to compare. Open the lot-specific certificate, check that it reports both purity and identity, and see whether it names the laboratory.
Then compare vial quantity and work out price per milligram, using measured net content where a certificate provides it. Note what the company publishes about itself.
Kylo, Caliber, and PeakForm currently publish the most; Puratek costs the least per mg and shows the least for this compound. Try whichever one survives those checks.
Disclaimers
All products discussed are supplied for laboratory research use only. They are not drugs or supplements, have not been approved by the FDA, and are not for human or veterinary consumption.
This page contains affiliate links. We may earn a commission on purchases made through them.
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