TB-500 for sale listings run from about $33 to $140 for products with near-identical names, and the label alone cannot tell you which vial is real. This page covers what to check once you have decided to buy.
Key Takeaways
- A batch COA is the minimum: lot number matching your vial, a recent test date, an HPLC figure, and a mass spec result for the exact form you ordered
- "Third-party tested" and "99%+" are marketing phrases until you can open the report and trace it to the lab
- On 2026-10-10, Ascension listed a 5mg vial at $54.00 ($10.80/mg), and other listings I checked ranged from under $3/mg to roughly $15/mg
- TB-500 is sold as a research chemical, not an approved drug, so no pharmacist or regulator checks the vial before it ships
- Price only makes sense next to the paperwork: a cheap vial with a thin COA is a worse deal than a fairly priced vial with a complete one
What TB-500 is, in research terms
TB-500 is the name research suppliers use for a synthetic version of thymosin beta-4, a small protein found in nearly every human cell type. In laboratory work it has been studied for its role in cell migration, actin regulation and tissue repair models. Almost all of that evidence comes from cell cultures and animals, and a confident claim about what it does in a person is a sales claim, not a finding.
The name is also loose. Different sellers use "TB-500" for different molecules, and which one you receive changes what a mass spectrum should show. We cover that split, and the regulatory timeline that sits behind it, in our guide to where to buy TB-500, so this page does not repeat it. The one point to carry over: the listing, the certificate and the observed mass must all describe the same molecule.
What TB-500 for sale actually means
When you see TB-500 for sale on a vendor site, you are looking at material labeled for laboratory use and marked not for human or animal consumption. That wording is the legal basis of the whole market, and it has plain consequences.
- No agency checks purity, sterility, fill weight or endotoxin before a vial ships.
- The seller decides which tests to run and which results to publish.
- There is no prescriber, no pharmacy record and no recall route if a lot is bad.
TB-500 is not an approved drug. If you are asking whether buying it is lawful, the honest answer is that selling it as a research chemical is common and openly done, while using it on yourself falls outside anything a regulator has reviewed.
How to read a TB-500 COA
Most advice stops at "make sure there is a COA". That is the easy part. A certificate of analysis is a lab report, and a report only protects you if you read it the way a chemist would. The grid below lists the six things to confirm, in the order I would check them.
Six checks for a TB-500 certificate of analysis
- 1Lot number
Same string as the lot printed on your vial - 2Test date
Recent, and later than the lot's fill date - 3Named lab
An outside lab, with a report you can trace to it - 4HPLC figure
A number, shown with the chromatogram - 5Mass spec
Observed mass matches the form you ordered - 6Content and safety
Net peptide content, endotoxin and sterility if offered
Lot number. A certificate for the product line is not a certificate for your vial. The lot on the report must match the lot printed on the label, character for character. If the seller shows one PDF for every order, treat the document as decoration.
Test date. A report from many months ago says little about a lot that was filled recently. Ascension's TB-500 5mg page, for example, lists two batches with their dates: a Kovera Labs batch tested on June 2, 2026 and an earlier MZ Biolabs batch tested on February 25, 2026. Both dates being visible is useful, because you can see which one matches the lot you receive.
HPLC purity. Chromatography reports what share of the sample is one dominant compound. Look for a number and for the trace itself. Ascension reports that its certificates pass at above 98%, with recent batches landing between 98.9% and 99.9%. A figure of exactly "99%+" with no trace attached is a claim, not a result.
Mass spectrometry. HPLC can give a lovely purity score for the wrong molecule. Mass spec checks that the observed mass matches the expected one, and for TB-500 the expected value depends on which form was ordered. A certificate that gives purity but no identity result is half a test.
Content and safety panels. Purity is the share of the peptide that is correct. Net peptide content is how much of the powder is peptide at all, and a vial can be pure and still underfilled. Endotoxin, sterility and heavy metals matter more for a product people inject than for one that stays in a freezer. Ascension says its batches, tested by Kovera Labs, cover HPLC, LC-MS identity, net content, endotoxin, sterility and heavy metals. Many sellers publish only the first line.
Third-party testing: independent, or it does not count
In-house testing is a seller grading its own homework. Independent means the batch went to an outside lab, and the report traces back to that lab rather than only to the seller's website. Named labs recur across the market, including Kovera Labs, MZ Biolabs, Janoshik and Vanguard Laboratory, and a named lab is a better sign than an anonymous one.
A lab's name on a PDF is not the finish line, because a PDF is a file anyone can edit. Where the lab offers a report lookup, use it. A serious report reproduces the chromatogram and the mass spectrum rather than a tidy summary box.
Reading product pages on 2026-10-10, I saw several patterns worth knowing about. One page called the product "99%+ by HPLC" but supported identity with HPLC-UV only, with no mass spectrometry. Another displayed its certificate as a preview image with no readable figures. A third said certificates are posted immediately for every batch in one place and available on request for some batches in another. None of these prove a bad vial. All of them are reasons to ask a question before paying, and a seller who answers clearly is telling you something too.
The table below sets out what the most common claims do and do not establish.
What common product-page claims prove
| What it proves | What it leaves open | |
|---|---|---|
| Third-party tested | A lab ran something on some batch | Which batch, which tests, and what the result was |
| 99%+ by HPLC | The main chromatographic peak is large | Whether the peak is the right molecule |
| Batch-specific COA | A document exists for a lot | Whether that lot is the one on your vial |
| COA shown as an image | The seller has a picture of a report | Nothing you can check or trace to the lab |
If you want the verification already done for you, Ascension Peptides tests every batch through Kovera Labs (older batches through MZ Biolabs), and 85 batch COAs are public. New customers can also take 50% off with code PEPTIDEDECK. Pull the certificate for the lot you receive anyway; that habit is the point of this page.
TB-500 price: a sanity check
On 2026-10-10, Ascension listed TB-500 5mg at $54.00, down from a $60.00 list price, which is $10.80 per mg. Buying 3, 5 or 10 vials takes 3%, 5% or 10% off. That sits inside the roughly $50 to $90 band our companion guide treats as fair for a 5mg vial.
Across the other listings I opened, per-mg pricing was much wider than that band suggests. A six-seller comparison page showed 10mg vials from $42.36 to $59.99, which works out to $4.24 to $6.00 per mg, and 5mg vials at $35.16 and $54.00. One seller listed a 10mg vial at $32.99, or $26.39 at ten vials. Another showed a range of $78 to $140 across 5mg and 10mg without saying which was which.
A low price is not proof of a bad vial. Large 10mg vials do cost less per mg, and some sellers run sales. What a low price does is remove your margin for error. Real batch testing costs money, so if the per-mg price is low and the certificate is also thin, that combination is the warning. Paying far above the band buys nothing you can verify either, so treat very high prices as a reason to compare, not as a quality signal.
The chart below puts the listings I checked on one per-mg axis, so the spread is visible at a glance.
TB-500 listed prices per mg, checked 2026-10-10
What actually arrives
A correct order is a small sealed glass vial holding a white lyophilized powder or thin cake under a crimped cap. The label should carry the compound name, quantity, lot number and a research-use statement. The powder looks the same whether it is right or wrong, which is exactly why appearance proves nothing.
Diluent is sold separately. Ascension does not sell bacteriostatic water, so plan that purchase elsewhere. Once reconstituted, a peptide solution is far less stable than the dry powder and needs refrigeration at 2 to 8 degrees Celsius.
Two arrival warnings. A vial that comes pre-mixed or as a liquid has given up the stability that makes lyophilized powder the standard format. A vial that is discolored, collapsed into a sticky film or visibly underfilled has probably met heat or moisture on the way. Photograph it, keep the packaging and contact the seller the same day. Ascension's sales are final with replacement only, so ask about the problem policy before you order, not after.
Red flags: walk away
The list below is the short version. The one flag that needs a number is price, so the ladder after the list gives the per-mg zones for a 5mg vial, built from the listings checked on 2026-10-10.
- No COA, or one emailed only after payment. Documents belong on the page before you buy.
- One generic certificate for every lot, or a lot number that does not match your vial.
- Purity with no identity result. No mass spec means half a test.
- Ambiguity about the molecule. If the listing does not say which form of TB-500 it is, the certificate cannot confirm it.
- Therapeutic claims. A page promising healing, hair growth or cardiac repair while also stamping "not for human use" has told you what its research label is worth.
- Prices far under the market, or permanent site-wide clearance pricing.
- Capsule or oral products. Peptides of this size are poorly stable orally, and verification of a capsule is far harder than of a vial.
- Crypto or bank transfer only, with no card option and no stated refund or replacement policy.
Legal and safety reality
Selling TB-500 as a research chemical is widespread and openly done in the US. That is the extent of the comfort available. It is not an approved medicine for any condition, and nobody has evaluated the specific material you would receive. Rules and enforcement priorities for peptides have been shifting through 2026, so check the current position before relying on anything, including this page.
Safety risk sits mostly downstream of quality. Impurities, wrong sequences and contamination are the realistic hazards with an unverified injectable, which is why the COA work above is not paperwork for its own sake. This is a research chemical, and decisions about personal use belong with a qualified clinician.
Pre-purchase checklist
- The listing names the exact form of TB-500, and the certificate describes the same form.
- The COA is public before you pay, and its lot number matches the vial you will receive.
- The test date is recent, the lab is named and independent, and real traces appear on the report.
- HPLC is above 98% and mass spec confirms identity.
- The per-mg price sits inside a believable band, and a low price is not paired with a thin certificate.
- Payment is by card, a replacement or refund policy is written down, and the product ships as lyophilized powder marked research use only.
Frequently Asked Questions
Is TB-500 legal to buy?
Selling and buying it as a research chemical is common in the US and done openly. That is different from being an approved medicine. TB-500 is not approved for any use, and pharmacies are not a dependable source. Rules outside the US vary, and peptide regulation has been changing during 2026, so check the current position where you live.
How much does TB-500 cost?
On 2026-10-10, Ascension listed a 5mg vial at $54.00 ($10.80/mg). Other listings I checked ranged from about $3 to about $15 per mg depending on vial size and seller. Compare per-mg, but read the certificate before you let price decide.
How do I know TB-500 is real?
Appearance cannot tell you. Look for a batch COA whose lot matches your vial, a recent test date, an HPLC figure with its trace, and a mass spec result for the exact form you ordered, from a named independent lab. See our where to buy TB-500 guide for the molecule differences.
Do I need a prescription for TB-500?
There is no approved prescription product to get, so buyers of research material are not asked for one. That also means no clinician or pharmacy is standing between you and an unverified vial, which puts the verification work on you.
Why do TB-500 prices vary so much?
Vial size, promotions, testing cost and margin all play a part. A real multi-test panel costs money per batch, so unusually low per-mg pricing deserves extra scrutiny of the certificate. Very high pricing is not proof of quality either.
Where to buy verified TB-500
If you have decided to buy and want the checks on this page already handled, Ascension Peptides is the vendor we point people to. The 5mg vial was $54.00 on 2026-10-10, with batch-specific COAs from Kovera Labs and MZ Biolabs, USD pricing, US-only shipping and free shipping over $250. New customers can use code PEPTIDEDECK for 50% off. Whoever you buy from, match the lot, read the purity figure, confirm the mass and make sure the price and the paperwork agree.
Medical Disclaimer: TB-500 is sold for laboratory research use only. It is not approved by the FDA or any comparable regulator for any condition, and it is not intended for human or veterinary consumption. This article is educational and is not medical advice, a dosing protocol, or a recommendation for personal use. Consult a qualified healthcare professional about any health concern.
