Best Thymosin Alpha-1 Suppliers in 2026: 41 Sellers, Priced per mg

Four different shops list a 10mg vial of thymosin alpha-1 at exactly $65.00. A fifth lands at $65.48. Scroll far enough down the same board and that identical 10mg vial reaches $185.00.

We priced thymosin alpha-1 at all 41 vendors carrying it in our August 10 refresh. Verified Peptides, Peptidology, Atomik Labz, Panda Peptides, and Behemoth Labz are the five we would point people to. The market median sits at $8.19 per mg, which makes roughly $80 the going rate for a 10mg vial, and the sellers landing well under that are largely the same ones publishing independent lab work.

The $65 shelf

Most peptides we track spread out smoothly across their price range. Thymosin alpha-1 clusters. Of the 32 vendors listing a 10mg vial, five land within fifty cents of $65.00, and four hit that number exactly: Atomik Labz, NextechLabs, Peptide Crafters, and Polaris Peptides. All four publish Finnrick COAs. That is a real anchor price, and it is a useful yardstick when a shop asks you for double.

Where the market sat in our latest run:

The full sortable table lives on our thymosin alpha-1 vendor page, and every listing is normalized per milligram on the price index so the vial sizes stop hiding the real number.

The five we would order from

We weight independent third-party lab testing heaviest, then price per mg, US shipping, reputation, catalog depth, and payment options. The whole rubric is public in how we score vendors. Here is where it lands for this one.

Verified Peptides: the cheapest US-shipping price we can confirm

$48.00 for 10mg, which works out to $4.80 per mg and beats every other domestic 10mg listing on our board by more than fifteen dollars. Finnrick handles the testing, the most rigorous lab source we track, and Verified Peptides holds one of the highest scorecards we keep. Credit card at checkout. For a first 10mg vial this is the easiest call in the category. Full scorecard.

Peptidology: the best paper trail on the board

$69.99 for 10mg, so $7.00 per mg, comfortably under the median. Scottsdale, Arizona, Finnrick COAs, and four payment rails including ACH and Zelle. Peptidology carries the strongest scorecard of any vendor we track across all 72 shops, and pairing that with a below-median price earns it a spot even though two sellers here undercut it. Full scorecard.

Atomik Labz: Finnrick work at the anchor price

$65.00 for 10mg, or $6.50 per mg, shipping out of Alexandria, Virginia with Finnrick testing and card, crypto, or Venmo at checkout. Of the four shops sitting exactly on the $65 anchor, this is the one we would use, and it sits near the top of our board. Full scorecard.

Panda Peptides: the low-commitment first order

$33.99 for 5mg is the cheapest way to watch how a shop handles packaging, cold shipping, and paperwork before you commit to a full vial. The per-mg math holds steady at $6.80 whether you take the 5mg or the 10mg at $67.99, which is unusually straight pricing. Janoshik tested, ships to US addresses out of the Greater Toronto Area, and the payment list is the widest of the group: Apple Pay, Google Pay, CashApp, Zelle, bank transfer, and card. That last part matters, because a payment rail with recourse is worth something on a first order. Full scorecard.

Behemoth Labz: the size play

$118.97 for 20mg, which lands at $5.95 per mg and is the second-cheapest per-mg number available to a US buyer. MZ Biolabs handles their testing. Behemoth is the only seller on the board offering 20mg and 50mg vials, so this is the pick for someone who already knows what they want and is buying at volume. Full scorecard.

Also worth a look: Polaris Peptides at $65 with Finnrick COAs and Venmo alongside card. NextechLabs matches that $65 with Finnrick testing. Orbitrex Peptides runs $79.99 out of Flower Mound, Texas, Finnrick tested, and sits in the top three of our whole board. NuLife Peptides lists $100 with Finnrick COAs and four payment rails.

Bigger vials pay off, up to a point

The vial ladder here does something we rarely see. Behemoth Labz prices 5mg at $84.86, 10mg at $65.48, 20mg at $118.97, and 50mg at $326.04. Run the per-mg math and that is $16.97, then $6.55, then $5.95, then back up to $6.52. Their 20mg vial is the best per-mg deal they offer, and it beats their own 50mg.

So sizing up helps, and it stops helping at a specific point that varies by shop. Check the arithmetic on every rung before you commit. And buy the vial you will realistically finish, because reconstituted material has a clock on it. Our storage and reconstitution guide covers how long you actually have.

Where thymosin alpha-1 stands with the FDA right now

This one has a more interesting regulatory file than most of the shelf, and it is worth understanding before you shop.

Thymosin alpha-1 was nominated for the FDA's 503A compounding bulks list, and the nomination was later withdrawn. FDA's published writeup on it now sits in the withdrawn-nominations table on the agency's Category 2 page, current as of April 22, 2026, where FDA states the safety information available is inadequate for it to understand the extent of any safety issues raised.

The July 2026 Pharmacy Compounding Advisory Committee meeting is the other half of the picture. On July 23 and 24 the committee recommended six peptides for the 503A bulks list: BPC-157, KPV, TB-500, MOTS-c, Epitalon, and Semax. Thymosin alpha-1 was absent from that slate. We covered the full outcome in our FDA peptide compounding roundup.

Outside the US the picture looks different. The synthetic form, thymalfasin, is approved in more than 35 countries for hepatitis B and C and as an immune enhancer in several other conditions, per a 2020 review in World Journal of Virology. In the US it is still awaiting FDA approval, and anything you buy through a research supply channel is labeled for laboratory research use.

What the largest human trial found

Here is the honest state of the evidence, because it shapes how much the vendor paperwork matters.

The biggest randomized test of this peptide is the TESTS trial, published in BMJ in January 2025 (Wu and colleagues, PMID 39814420). Across 22 centres, 1,089 adults with sepsis were randomized to thymosin alpha-1 or placebo. Twenty-eight day mortality came in at 23.4% in the treatment arm against 24.1% on placebo, a hazard ratio of 0.99. The authors found no clear evidence that it reduced mortality in that population. Decades of hepatitis B work sit behind the international approvals, and the sepsis question came back flat.

Which is exactly why the certificate matters. When a seller publishes a COA from a named independent lab, matched to the product and the batch in your cart, you at least know what is in the vial you paid for. Our guide to reading a peptide COA walks through the 60 second version, and the full vendor comparison shows which of the 72 shops we track publish one.

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