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Market data · 21 suppliers · United States

Thymosin Alpha-1 prices in the US: 21 suppliers compared

21 of the suppliers we track list Thymosin Alpha-1 in or shipping to the US. They are ranked by PepFinder Score, which combines reliability, selection, pricing, delivery, support and customer reviews, and shown with the prices they list per mg. We don't sell Thymosin Alpha-1, and we give no guidance on its use.Also listed as: Tα1, Thymalfasin

Prices checked 23 Sept 2026 · 36 listings · 28 in stock · Thymic peptides

Thymosin Alpha-1 · listed price per mg
USD · 17 suppliersmedian US$8.33/mg
US$5.20/mgUS$499.94/mg

Each currency is shown separately; prices are never converted.

Regulatory status

In United States the regulator is the U.S. Food and Drug Administration (FDA). Rules on buying, importing and using this product differ by country. Suppliers list it for laboratory research; nothing here is medical advice.

At a glance · 23 Sept 2026

Suppliers serving the US
21 list Thymosin Alpha-1, 28 listings in stock
Price per mg (USD)
US$5.20/mg to US$499.94/mg, median US$8.33/mg, across 32 listings from 17 suppliers
Test certificates
Not yet collected by PepFinder for Thymosin Alpha-1; check each supplier's site. How to read a COA
Legal status in the US
The FDA treats research peptides sold for human use as unapproved new drugs and has said in 2026 warning letters that research-use-only labels do not change that. Full summary with sources

What Thymosin Alpha-1 is

Thymosin alpha-1 is a 28-amino-acid peptide first isolated from calf thymus in 1977 and studied as an immune modulator. A synthetic version, thymalfasin (Zadaxin), is sold as a medicine in a number of countries, which its manufacturer has said are mainly in Asia, the Middle East and Latin America, but it is not approved by the FDA. Unlike most research peptides, it has been tested in large human trials, with mixed results. Read the full Thymosin Alpha-1 guide, with the published research and references.

  2. 02

    Direct SARMS

    US based
    No reviews yetFrom US$5.98/mg
    7.7/ 10PepFinder ScoreRead the review →
    Listing as namedSizePricePer mgStock
    Thymosin Alpha-1 Peptide Vial10mg vialUS$70.31US$7.03/mgIn stockOn their site ↗
    Thymosin alpha-1 Pre Mixed Peptide 10mg2 cartridgesUS$147.08US$14.71/mgIn stockOn their site ↗
    Thymosin alpha-1 Pre Mixed Peptide 10mg1 cartridgeUS$73.54US$7.35/mgIn stockOn their site ↗
    Thymosin alpha-1 Pre Mixed Peptide 10mg3 cartridgesUS$198.55US$19.86/mgIn stockOn their site ↗
    Thymosin Alpha-1 Peptide Vial2 x 10mg Vial (Twin Pack)US$126.55US$6.33/mgIn stockOn their site ↗
    Thymosin Alpha-1 Peptide Vial4 x 10mg Vial (Value Pack)US$239.05US$5.98/mgIn stockOn their site ↗
  7. 07

    Licensed Peptides

    US based
    Third-party testing statedCOA page linked, not reviewed
    No reviews yetFrom US$7.20/mg
    7.4/ 10PepFinder ScoreRead the review →
    Listing as namedSizePricePer mgStock
    Thymosin Alpha-1 5mg5mg / 1 packUS$61.99US$12.40/mgIn stockOn their site ↗
    Thymosin Alpha-1 5mg5mg / 3 packUS$154.74US$10.32/mgOut of stockOn their site ↗
    Thymosin Alpha-1 5mg5mg / 5 packUS$218.90US$8.76/mgOut of stockOn their site ↗
    Thymosin Alpha-1 5mg (10 vials)5mgUS$359.95US$7.20/mgOut of stockOn their site ↗
    Thymosin Alpha-1 5mg5mg / 10 packUS$359.95US$7.20/mgOut of stockOn their site ↗
  15. 15

    Xeno

    US based
    Third-party testing statedCOA page linked, not reviewed
    No reviews yetFrom US$6.20/mg
    6.7/ 10PepFinder ScoreRead the review →
    Listing as namedSizePricePer mgStock
    Thymosin Alpha-110MGUS$62.00US$6.20/mgIn stockOn their site ↗
  16. 16

    Evolve Peptides

    US based
    Third-party testing statedCOA page linked, not reviewed
    No reviews yetFrom US$12.00/mg
    6.6/ 10PepFinder ScoreRead the review →
    Listing as namedSizePricePer mgStock
    Thymosin Alpha-1 5 mg5 mgUS$60.00US$12.00/mgIn stockOn their site ↗
  18. 18

    Regentide

    US based
    COA page linked, not reviewed
    No reviews yetFrom US$11.00/mg
    6.4/ 10PepFinder ScoreRead the review →
    Listing as namedSizePricePer mgStock
    TA-1 (Thymosin Alpha-1) 10mg10mgUS$109.99US$11.00/mgIn stockOn their site ↗

Thymosin Alpha-1 market over time

The median listed price per mg across every tracked supplier listing Thymosin Alpha-1 in each currency, recorded daily from validated listings only. Days with too few listings to publish are left out, not estimated. How we validate prices

USD · median per mg

No validated daily statistics yet. A trend appears once there is more than one day of data.

Catalogue changes, last 30 days

No Thymosin Alpha-1 listings added or withdrawn since we began recording catalogue changes.

Before you choose a Thymosin Alpha-1 supplier

Price per mg is only half the comparison. Check that the supplier publishes a certificate of analysis for the batch it is selling, ideally from an independent laboratory, and that the certificate confirms identity as well as purity: our guide on how to read a COA shows what to look for. A price far below the rest of the list is more often a warning than a bargain; peptide prices explained sets out why.

For what Thymosin Alpha-1 is and what published studies have found, see our Thymosin Alpha-1 guide. Handling questions are covered in how to store peptides, and the peptide calculator converts a vial size and water volume into concentration and syringe units. Rules on buying and importing differ by country: read are peptides legal in the US? and see all suppliers serving the US.

Checking a Thymosin Alpha-1 certificate of analysis

  1. The certificate names a laboratory you can find independently, and ideally one with no stake in the result.
  2. It carries a batch or lot number that matches the product page or the vial label, and a test date.
  3. It confirms identity by mass spectrometry, not only purity by HPLC. Purity alone does not show the vial contains Thymosin Alpha-1.
  4. It includes the chromatogram and mass spectrum, not just a summary table.
  5. Where the laboratory offers online verification of its reports, the report number checks out.

Red flags

  • No certificates at all, or certificates available only “on request”.
  • The same certificate used for several products or several years of stock.
  • Payment only by cryptocurrency or bank transfer, with a discount for paying that way.
  • A price far below every other supplier on this page.
  • No company name, address or way to contact the business other than a web form.
  • Vials labelled only with a code rather than the product name and strength.

How to spot a fake peptide supplier explains each of these in more detail, and third-party peptide testing covers what independent results can and cannot prove.

Vials, capsules and pre-mixed products

Most research peptides are sold as freeze-dried (lyophilised) powder in sealed vials, which is mixed with a diluent such as bacteriostatic water before use in the lab. Some suppliers also sell pre-mixed solutions, nasal sprays or capsules under the same name. These are different products with different stability and dosing, so compare price per mg only between the same form, and check which form a listing is before comparing it with the rest of the table.

Thymosin Alpha-1 in the US: questions

Where can I buy Thymosin Alpha-1 in the US?

21 of the suppliers PepFinder tracks list Thymosin Alpha-1 and are based in or ship to the US. The highest rated are Polaris Peptides, Direct SARMS, True Research Labs. The list on this page is ranked by PepFinder Score, which weighs reliability, delivery, pricing, support and customer reviews; nobody pays to be included or to rank higher.

How much does Thymosin Alpha-1 cost in the US?

Listed prices in USD run from US$5.20/mg to US$499.94/mg, median US$8.33/mg, across 32 listings from 17 suppliers. Compare price per mg rather than price per vial, and only within one currency; a price far below the rest is more often a warning than a bargain.

What sizes is Thymosin Alpha-1 sold in?

Suppliers on this page list Thymosin Alpha-1 in 500mcg, 5mg, 5mg / 1 pack, 5 mg, 6 mg, 10mg. Most research peptides are sold as freeze-dried powder in sealed vials; capsules, sprays and pre-mixed solutions are different products, so compare price per mg only between the same form.

Is it legal to buy Thymosin Alpha-1 in the US?

The FDA treats research peptides sold for human use as unapproved new drugs and has said in 2026 warning letters that research-use-only labels do not change that. Our page on whether peptides are legal in the US sets out the rules with a link to every source. This is general information, not legal advice.

Can Thymosin Alpha-1 be shipped to the US?

The FDA says it is illegal in most circumstances for individuals to import drugs for personal use, and shipments it considers unapproved drugs can be refused entry. Each supplier on this page shows where it is based, so you can see whether an order would cross a border.

How do I check a Thymosin Alpha-1 supplier's test results?

Ask for a certificate of analysis for the batch being sold, and check that it names the laboratory, the batch number and the test date, and that it confirms identity by mass spectrometry as well as purity by HPLC. PepFinder has not yet collected certificates for Thymosin Alpha-1 from these suppliers, so check each supplier's own site.

How this list is built: suppliers appear because they list Thymosin Alpha-1 on their own website, read by our catalogue checks; nobody pays to be included or to move up. Ranking is by PepFinder Score. Prices, sizes and stock are as each site listed them when checked and may have changed. Provisional scores are based on incomplete research.