Where to buy TB-500 (also sold as Thymosin Beta-4 fragment, TB4): the 49 vendors below are the ones we have a dated product-page price for, ranked on documentation first and price second. Nothing here is typed from memory — every number links to a date.
Research use only. Compound Review scores vendors on documentation — laboratory certificates, lot records, pricing and company identity. Nothing on this page is guidance on human or veterinary use, dosing or health outcomes.
Reference size 10mg — the size most of these vendors sell. Other sizes we have on record are listed per vendor.
| # | Vendor | Rubric | 10mg price | Other sizes | Trustpilot | Buy |
|---|---|---|---|---|---|---|
| 1 | Purgo LabsPartner SteriGenix · Freedom Diagnostics | 10/10 | $49.99 ($5.00/mg · 2 Oct 2026 · was $49.99 · list price; OCTOBER code banner (15% off) shown, not applied) | — | 4.7 (99 reviews) | HEALTH 20% off every order |
| 2 | MyPurePeptidePartner Janoshik Analytical | 10/10 | $25.00 ($2.50/mg · 30 Sept 2026 · report #223097) | — | 4.7 (177 reviews) | HEALTH 20% off |
| 3 | Peptide GiantsPartner Janoshik Analytical · Vanguard Laboratory | 10/10 | $48.00 ($4.80/mg · 2 Oct 2026 · was $48.00 · sale; list $68.57 struck) | — | 4.6 (65 reviews) | health 10% off |
| 4 | Rivn PeptidesPartner Freedom Diagnostics | 9/10 | $49.99 ($5.00/mg · 2 Oct 2026 · was $49.99 · sale; list $50 struck) | — | 4.9 (603 reviews) | compoundreview15 15% off |
| 5 | Ameano PeptidesPartner Janoshik Analytical | 9/10 | $75.00 ($7.50/mg · 2 Oct 2026 · was $75.00 · sold as TB-500 (Thymosin Beta-4)) | — | 4.8 (461 reviews) | compound 10% off |
| 6 | Amino ClubPartner ILS Labs | 9/10 | $39.99 ($4.00/mg · 2 Oct 2026 · was $39.99 · list price; FALL40 code banner (40% off) shown, not applied) | — | 4.6 (573 reviews) | WELLNESS 20% off |
| 7 | Modified Aminos Ethos Analytics | 9/10 | $39.99 ($4.00/mg · 29 Sept 2026 · lot MA-TB5I-100) | — | 4.8 (258 reviews) | Visit |
| 8 | Idun Peptides Kovera Labs (named in certificate captions only) | 9/10 | $44.99 ($4.50/mg · 5 Sept 2026) | — | 4.9 (161 reviews) | Visit |
| 9 | PS PeptidesPartner North American Diagnostics | 8/10 | $79.99 ($8.00/mg · 2 Oct 2026 · was $79.99) | — | 4.3 (204 reviews) | HEALTH 10% off |
| 10 | EZ PeptidesPartner Janoshik Analytical | 8/10 | $68.00 ($6.80/mg · 2 Oct 2026 · was $68.00 · sold as TB4 10mg) | — | profile removed | compoundreview 10% off |
| 11 | Offline PeptidesPartner Freedom Diagnostics | 8/10 | $56.00 ($5.60/mg · 29 Sept 2026) | 5mg $36.00 | 4.8 (99 reviews) | CR10 10% off |
| 12 | Everest Peptides Freedom Diagnostics | 8/10 | $44.99 ($4.50/mg · 2 Oct 2026 · was $49.99 · sale; list $59.99 struck (25% off)) | — | 4.8 (58 reviews) | Visit |
| 13 | Modern Research Peptides Freedom Diagnostics | 8/10 | $46.99 ($4.70/mg · 29 Sept 2026 · title prints measured 11.58mg) | 5mg $34.27 | 4.2 (19 reviews) | Visit |
| 14 | Mile High Compounds Kovera Labs · Chromate | 8/10 | $59.99 ($6.00/mg · 11 Sept 2026 · sale price; list $69.99) | — | 4.8 (502 reviews) | Visit |
| 15 | Oros Research Ethos Analytics | 8/10 | $59.99 ($6.00/mg · 29 Sept 2026) | 5mg $29.99 | 4.8 (475 reviews) | Visit |
| 16 | Nova Peptides Freedom Diagnostics | 8/10 | $59.99 ($6.00/mg · 29 Sept 2026) | 5mg $34.99 | 4.8 (71 reviews) | Visit |
| 17 | Protide Health Freedom Diagnostics | 8/10 | $85.00 ($8.50/mg · 2 Oct 2026 · was $85.00) | — | profile removed | Visit |
| 18 | Northline Labs Horizon Analytical (on certificates) | 8/10 | $99.99 ($10.00/mg · 2 Oct 2026 · was $99.99) | — | 4.3 (501 reviews) | Visit |
| 19 | BioLongevity LabsPartner SafeCert Labs · MDx BioAnalytical · BioRegen | 8/10 | $164.97 ($16.50/mg · 2 Oct 2026 · was $164.97 · list price; September 40%-off sale ended, no struck price shown) | — | profile removed | Visit |
| 20 | Instant Peptides Kovera Labs · Freedom Diagnostics | 7/10 | $45.95 ($4.60/mg · 2 Oct 2026 · was $50.00 · list price, no struck price shown) | — | profile removed | Visit |
| 21 | Peptira Freedom Diagnostics | 7/10 | $49.00 ($4.90/mg · 18 Sept 2026 · sale banner active; no struck list price shown) | — | profile removed | Visit |
| 22 | Midwest Peptide Precision Mass Spec (on certificates) | 7/10 | $49.99 ($5.00/mg · 2 Oct 2026 · was $49.99 · read from product page structured data; researcher-verification overlay not accepted) | — | 4.9 (316 reviews) | Visit |
| 23 | Evo Labs Research Janoshik Analytical · Kovera Labs | 7/10 | $49.99 ($5.00/mg · 2 Oct 2026 · was $49.99 · list price; FALL20 code banner shown, not applied) | — | profile removed | Visit |
| 24 | Profound Aminos Janoshik Analytical | 7/10 | $55.00 ($5.50/mg · 2 Oct 2026 · was $55.00) | 5mg $33.00 | 4.5 (235 reviews) | Visit |
| 25 | Global Aminos Freedom Diagnostics (on certificates) | 7/10 | $56.09 ($5.61/mg · 2 Oct 2026 · was $39.59 · sale; list $65.99 struck; read from served product page; 21+ age overlay not accepted) | — | 4.7 (40 reviews) | Visit |
| 26 | Modern AminosPartner Freedom Diagnostics (on certificate) · Kovera · Vanguard · Chromate · TrustPointe (claimed) | 7/10 | $59.00 ($5.90/mg · 2 Oct 2026 · was $59.00) | 5mg $34.00 | profile removed | Visit $30 off via our link |
| 27 | True PeptidesPartner Optiq Health Labs | 7/10 | $61.00 ($6.10/mg · 1 Oct 2026 · backorder) | — | no record | COMPOUNDREVIEW 10% off |
| 28 | Honest Peptide Freedom Diagnostics (on certificates) | 7/10 | $63.00 ($6.30/mg · 2 Oct 2026 · was $63.00 · read from served product page; 21+ age overlay not accepted) | — | 4.4 (42 reviews) | Visit |
| 29 | BioGenix Peptides Horizon Analytical | 7/10 | $64.00 ($6.40/mg · 29 Sept 2026) | — | 4.8 (138 reviews) | Visit |
| 30 | LuvionBio Freedom Diagnostics | 7/10 | $64.99 ($6.50/mg · 29 Sept 2026 · read through a registered account) | 5mg $39.99 | 4.7 (146 reviews) | Visit |
| 31 | Petratide Science ILS Labs | 7/10 | not sold at 10mg | 5mg $34.95 | 4.2 (41 reviews) | Visit |
| 32 | Apex PeptidesPartner Freedom Diagnostics | 7/10 | $95.00 ($9.50/mg · 2 Oct 2026 · was $95.00 · site header shows 'TEMPORARILY CLOSED' though add-to-cart is enabled | site header reads 'TEMPORARILY CLOSED' on 2 Oct 2026; recorded as unavailable pending a re-read; sold out when checked) | — | profile removed | Visit |
| 33 | Elite Edge BiotechPartner Baler Lab | 6/10 | $38.00 ($3.80/mg · 2 Oct 2026 · was $38.00 · sale; list $76 struck) | — | 4.8 (176 reviews) | 10COMPOUNDRE 10% off |
| 34 | AIO Peptides Freedom Diagnostics | 6/10 | $49.50 ($4.95/mg · 1 Oct 2026 · logged in; 25% sitewide sale, list $66.00 struck; lot AIOTB326 on the COA page) | — | profile removed | Visit |
| 35 | NeuroLabs Research Freedom Diagnostics | 6/10 | $52.73 ($5.27/mg · 2 Oct 2026 · was $47.94 · single-vial price from served product page; 21+ overlay not accepted) | — | 4.3 (47 reviews) | Visit |
| 36 | Glacier Aminos Ethos Analytics (on certificates) | 6/10 | $58.99 ($5.90/mg · 5 Sept 2026 · read via public store API) | — | 4.6 (117 reviews) | Visit |
| 37 | AMC Essentials | 6/10 | $64.99 ($6.50/mg · 11 Sept 2026) | — | 4.9 (307 reviews) | Visit |
| 38 | Optima Supply Janoshik Analytical · Chromate Labs · ILS-Lab | 6/10 | $65.00 ($6.50/mg · 5 Sept 2026) | — | profile removed | Visit |
| 39 | Arizen BioLabsPartner Janoshik (on certificates) | 6/10 | $79.99 ($8.00/mg · 2 Oct 2026 · was $79.99 · list price; FALL30 code (30% off) shown, not applied) | — | 4.8 (44 reviews) | HEALTH 10% off |
| 40 | Direct Peptides Horizon Analytical | 6/10 | $99.00 ($9.90/mg · 2 Oct 2026 · was $99.00 · product URL discovered (manifest had homepage)) | — | profile removed | Visit |
| 41 | Biotech Peptides MZ Biolabs | 6/10 | $124.00 ($12.40/mg · 2 Oct 2026 · was $124.00 · product URL discovered (manifest had shop page)) | — | profile removed | Visit |
| 42 | Lost Coast Aminos BTLabs (on certificates) | 5/10 | $30.00 ($3.00/mg · 2 Oct 2026 · was $34.00 · sale; list $44 struck; out of stock (no add-to-cart); sold out when checked) | — | 4.7 (37 reviews) | Visit |
| 43 | BioEdge Research Labs | 5/10 | $67.00 ($6.70/mg · 11 Sept 2026 · sold as 'TB4 (TB500)') | — | 4.5 (15 reviews) | Visit |
| 44 | Ascension Peptides Kovera Labs · MZ Biolabs | 5/10 | not sold at 10mg | 5mg $54.00 | profile removed | Visit |
| 45 | Swiss Chems Janoshik Analytical | 4/10 | not sold at 10mg | 2mg $23.96 | profile removed | Visit |
| 46 | Ascend Amino | 3/10 | $50.00 ($5.00/mg · 2 Oct 2026 · was $50.00 · sold as TB500 10mg) | — | 4.6 (37 reviews) | Visit |
| 47 | Atomik Labz | 2/10 | $65.00 ($6.50/mg · 11 Sept 2026 · store feed; product pages require login) | 20mg $140.00 | 2.7 (34 reviews) | Visit |
| 48 | Polaris Peptides | 2/10 | $70.00 ($7.00/mg · 6 Sept 2026 · public store API) | — | 4.1 (34 reviews) | Visit |
| 49 | FelixChem (Felix Chemical Supply) | 2/10 | $70.00 ($7.00/mg · 11 Sept 2026 · store feed; product pages redirect to registration) | — | 3.5 (2 reviews) | Visit |
TB-500 is sold by almost every research-peptide vendor, usually next to BPC-157 and often as a blend with it. Universal availability cuts both ways: the compound is easy to find, and the field includes vendors with no independent review record and certificates that never leave the vendor's own site.
The name itself is worth understanding before you buy. TB-500 is a synthetic fragment of thymosin beta-4 (residues 17–23, the actin-binding region), not the full 43-amino-acid protein. Some vendors label the product 'thymosin beta-4' or 'TB4' while shipping the fragment; a certificate that states the sequence or a molecular weight near 890 Da resolves the ambiguity. Full-length thymosin beta-4 has a molecular weight near 4,963 Da and is rarely what is sold.
Because so many vendors carry it, TB-500 is one of the compounds where documentation and price can be compared directly across the field. That is what the table above does: the same rubric for every vendor, and a product-page price with a date for each.
What we can verify
Publishes per-lot COAs naming the testing laboratory — SteriGenix and Freedom Diagnostics — with lot numbers, test dates, measured net peptide content and direct verify-at-lab links. HPLC and mass spectrometry testing, US-based fulfilment from Scottsdale, Arizona, same-day dispatch on weekday orders before 2PM EST, and a 60-day money-back guarantee.
Net content: Measured net peptide published per lot (e.g. BPC-157 lot PL-BPC-05: 11.16mg vs 10mg label)
Where it falls short
Smaller independent review base than several competitors (80 reviews). The catalog is peptide-focused, so researchers also working with SARMs or broader research chemicals will need a second supplier.
What we can verify
Janoshik Analytical report #223088 for BPC-157 10mg batch 10242025B2 (sample received 17 Aug, analysed 24 Aug 2026): 11.61mg measured, purity 99.635%. We opened it on the lab's own verification page (key 1GTY19EIMQE4) on 30 Sep 2026 — client, manufacturer and batch print as MyPurePeptide. A public COA directory lists 103 report records across 47 products, each with task number, verification key, report batch, the original report image and the sample photograph, plus endotoxin reports for most lots; every product page links its current report. Open catalog with sized prices (BPC-157 10mg $25; TB-500 10mg $25; GHK-Cu 100mg $35; Ipamorelin 10mg $25; Tesamorelin 10mg $40; NAD+ 500mg $35). Legal entity myPurePeptide LLC with a mailing address in Austin, Texas; Visa and American Express at checkout. Trustpilot 4.7 across 177 reviews, claimed December 2025.
Net content: Report states 11.61mg measured on a 10mg label (116% — just over our 115% flag line), purity 99.635%; TB-500 #223097 11.54mg / 99.007%
Where it falls short
The printed address (12407 N Mopac Expy Ste 250 PMB 570, Austin) is a commercial mailbox, not premises — identity is awarded on the named LLC with that disclosure. The BPC-157 report measures 11.61mg on a 10mg label, 116% — just over our 115% flag line; TB-500 10mg measured 11.54mg. The vendor's own site says a report 'alone does not confirm the lot shipped'. The GLP-class pages print strike-through reference prices far above the selling price (Semaglutide 10mg 'was $399.99', now $70; Retatrutide 10mg 'was $699.99', now $80) — treat the 'you save' figures as marketing. Zelle is offered alongside cards. Returns: 7-day unopened window with a continuous unboxing video required for damage claims. A domain lookalike (mypurepeptides.com) is disclaimed on the vendor's homepage.
What we can verify
Names Janoshik Analytical and Vanguard Laboratory; certificates resolve on the lab's own domain (verify.janoshik.com). Product pages list dated batch codes for previous certificates, no account required. Legal entity, Tampa, FL address, EIN and sales-tax number published: Plainview Commerce LLC. Full basket with sized pricing, stable across reads.
Net content: Vanguard Laboratory PDF for lot PG-5101 (TB-500 5mg) reports 4.92mg measured vs 5mg, 99.30% purity — read 6 Sep 2026
Where it falls short
Small review base (65 on Trustpilot, 26 Sep 2026). Measured net content could not be read from the certificate images. The legal entity name appears on the refund policy but not the About page. GLP products sold under house codes PG-1SG / PG-2TZ / PG-3RT.
Purgo Labs sits at #1 of 49 on this page: 10/10 on the rubric, 10mg at $49.99 read 2 Oct 2026. Code HEALTH gives 20% off every order. We earn a commission; it did not decide the order above.
Visit Purgo Labs — code HEALTHBefore you order, check the batch
A ranking tells you which vendors have good practices; it cannot tell you about the specific vial you receive. When your order arrives, compare the batch number on the label to the certificate. If they do not match, or there is no batch number, the documentation does not cover what you were sent, regardless of who you bought from. How to read a peptide COA.
As of 2 Oct 2026, 49 of the 77 vendors on our scoreboard list TB-500 with a price we have read on the product page: Purgo Labs, MyPurePeptide, Peptide Giants, Rivn Peptides, Ameano Peptides, Amino Club, Modified Aminos, Idun Peptides, PS Peptides, EZ Peptides, Offline Peptides, Everest Peptides, Modern Research Peptides, Mile High Compounds, Oros Research, Nova Peptides, Protide Health, Northline Labs, BioLongevity Labs, Instant Peptides, Peptira, Midwest Peptide, Evo Labs Research, Profound Aminos, Global Aminos, Modern Aminos, True Peptides, Honest Peptide, BioGenix Peptides, LuvionBio, Petratide Science, Apex Peptides, Elite Edge Biotech, AIO Peptides, NeuroLabs Research, Glacier Aminos, AMC Essentials, Optima Supply, Arizen BioLabs, Direct Peptides, Biotech Peptides, Lost Coast Aminos, BioEdge Research Labs, Ascension Peptides, Swiss Chems, Ascend Amino, Atomik Labz, Polaris Peptides, FelixChem (Felix Chemical Supply). Every one of them is scored on the same 10-point rubric; the table above shows the score, the dated price and what you can verify before ordering.
At the 10mg size, the lowest price we have on record is MyPurePeptide at $25.00 (read 30 Sept 2026) — report #223097. It scores 10/10 on documentation. Price is the second sort key on this page, not the first, because an underdosed vial at a low price is the most expensive outcome.
Purgo Labs, MyPurePeptide, Peptide Giants share the top score at 10/10: named laboratory, certificates that resolve on the laboratory's own site, measured milligrams against the label, and a published legal identity. The per-criterion evidence, with dates, is on each vendor's review page.
TB-500 is sold by these vendors as a research chemical for laboratory use, not for human consumption; none of it is FDA-approved in this form. Legality of purchase varies by jurisdiction and the compound, and it is your responsibility to know your local rules. Our pages assess documentation and pricing; they are not legal or medical advice.
Rubric score first. Among equal scores, the lower verified price per milligram at 10mg. Then the larger independent review base. Affiliate partnership is not an input: 15 of the 49 vendors here are partners and they sit wherever the evidence puts them.
No. TB-500 is a short synthetic fragment of thymosin beta-4 covering its actin-binding region; the full protein is 43 amino acids. Vendors sometimes use the names interchangeably. A certificate that reports the sequence or a molecular weight near 890 Da tells you which one you have.
It depends on the research design. A blend fixes the ratio between the two peptides, which suits a protocol that uses both at a set proportion and complicates one that needs to vary either. Single-compound vials from a documented vendor are the more flexible starting point; the same vendors on this page generally sell the blend as well.