Where to buy Thymosin Alpha-1 (also sold as Tα1, Thymalfasin, TA1): the 4 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.
Reference size 5mg — the size most of these vendors sell. Other sizes we have on record are listed per vendor.
| # | Vendor | Rubric | 5mg price | Other sizes | Trustpilot | Buy |
|---|---|---|---|---|---|---|
| 1 | Chameleon Peptides Janoshik Analytical · Vanguard | 10/10 | $53.10 ($10.62/mg · 23 Sept 2026 · list price; sold out when checked) | — | 5.0 (546 reviews) | Visit |
| 2 | Puratek PeptidesPartner ILS Laboratories (on certificates) · page credits Freedom Diagnostics | 7/10 | not sold at 5mg | 10mg $59.95 | profile removed | Visit |
| 3 | PS PeptidesPartner North American Diagnostics | 7/10 | $54.99 ($11.00/mg · 23 Sept 2026 · list price) | — | 4.2 (175 reviews) | HEALTH 10% off |
| 4 | Licensed PeptidesPartner Vanguard Laboratory (printed 'Vangaurd' on COA panels) | 5/10 | $61.99 ($12.40/mg · 23 Sept 2026 · list price; 5mg; sold as 'Thymosin Alpha-1 5mg') | — | profile removed | Affiliate5 5% off |
Thymosin alpha-1 (thymalfasin) is a 28-residue peptide that is approved as a prescription product in a number of countries and sold on the research market by fewer vendors than the popular healing peptides. It is longer and more expensive to synthesise than most compounds here, and vial sizes are correspondingly smaller.
It is routinely confused with TB-500, which is a fragment of thymosin beta-4 — a different protein with a different sequence and a different research literature. Catalogs list the two near each other and the names look alike; the certificate's mass-spectrometry identity is what tells them apart.
At least one vendor we read listed it as out of stock at the time. Availability is noted per vendor, and the ordering is by rubric score first because the field is too small for a price ranking to mean much.
What we can verify
Public COA & Batch Verification Ledger covering 44 products and 87 batches with 539 COA links, including 380 Janoshik Analytical references (ISO 17025) and 141 Vanguard references. 4.9 across 311 Trustpilot reviews. Card, Apple Pay and ACH payments; free FedEx 2Day shipping from Sacramento; legal entity disclosed (Origin Sourcing Group LLC).
Net content: Janoshik report #194142 (BPC-157 10mg, batch B002) states 11.56mg measured vs 10mg label, 99.557% purity — read on verify.janoshik.com 6 Sep 2026
Where it falls short
Catalog includes hormone-class products (HCG, HGH 191AA, HMG) alongside peptides, a regulatory-sensitive class. Not an affiliate partner — we earn nothing from this vendor, and it ranks where the rubric puts it.
What we can verify
Credits Freedom Diagnostics on a certifications page listing dozens of batch-labelled certificate images viewable without login. Legal entity, address and phone published: Puratek LLC, Las Vegas, NV. Cheapest BPC-157 10mg in this batch at $29.95.
Net content: Certificate reports Net Peptide Content 10.7mg (V0) / 10.45mg (V1) vs 10mg label, 99.96% purity (lot BPC10005)
Where it falls short
Trustpilot profile removed for guideline violations (read 5 Sep 2026) — no independent review base. The certificate we opened is an ILS Laboratories report (COA-2026-413074, lot BPC10005, 10.7mg vs 10mg) with an ILS access code — while the certifications page credits Freedom Diagnostics. Purity guarantee is 99% on the homepage and 98.5% on the policy page. TB-500 and GLP products are listed without stated sizes, and the GLP compound identities are not stated.
What we can verify
Names North American Diagnostics; certificates carry lab test IDs, are downloadable on every product page without an account, and publish measured mass against label (5.03mg vs 5mg on the example). Widest GLP range in this batch with sized pricing. Legal entity disclosed: ProSupply Services LLC.
Net content: Measured mass vs label published (5.03mg measured vs 5mg label on BPC-157 example)
Where it falls short
Lowest Trustpilot average of the batch (4.1), and the vendor's own blog claims a '5-star Trustpilot rating from thousands of customers' that the live record does not support. No street address — 'New Jersey-based' only. Certificate PDFs are vendor-hosted; the lab's lookup portal needs JavaScript.
Before 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 23 Sept 2026, 4 of the 59 vendors on our scoreboard list Thymosin Alpha-1 with a price we have read on the product page: Chameleon Peptides, Puratek Peptides, PS Peptides, Licensed Peptides. 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 5mg size, the lowest price we have on record is Chameleon Peptides at $53.10 (read 23 Sept 2026) — list price; sold out when checked. 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.
Chameleon Peptides leads 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.
Thymosin Alpha-1 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 5mg. Then the larger independent review base. Affiliate partnership is not an input: 3 of the 4 vendors here are partners and they sit wherever the evidence puts them.
No. Thymosin alpha-1 is a 28-residue peptide from prothymosin alpha; TB-500 is a short fragment of thymosin beta-4. They share the word thymosin and nothing else that matters. Check the certificate's stated molecular weight if the listing is ambiguous.
Length. Synthesis cost and the chance of impurity both rise with the number of residues, and a 28-residue peptide is at the long end of what research vendors stock. Compare per milligram at the same size.