Thymosin Alpha-1 is sold here for laboratory research, in 2 sizes (5mg to 10mg), starting at $70.00 a vial. Every batch arrives with a certificate naming the test that identified it, the test that measured its purity, and the date each was run. It is not an FDA-approved medicine. Research use only, and never for people or animals.
Thymosin Alpha 1 specifications
| Product name | Thymosin Alpha-1 |
|---|---|
| Also sold as | thymalfasin, Thymosin alpha 1 peptide |
| Formula | C129H215N33O55 |
| Physical form | Freeze-dried powder — a solid cake in a sealed vial |
| Appearance | White to off-white cake |
| Sizes on this page | 5mg · 10mg |
| Purity specification | ≥99% by RP-HPLC. The number for the lot you receive is whatever its own certificate says. |
| Identity check | Mass spectrometry, read against the mass this compound should have |
| Net content | Weighed per lot and reported separately from purity |
| Lot documentation | At the laboratory — each certificate posts here the day it clears |
| Storage | Sealed, cold and out of the light |
| Ships from | Santa Ana, California — same business day on verified in-stock orders placed before 12 PM Pacific |
| Intended use | Laboratory research only. Not for human or animal use. |
What is Thymosin Alpha 1, and what is it used for?
Thymosin Alpha 1 is also listed and searched as thymalfasin, Thymosin alpha 1 peptide. They all mean the same compound. Supplier lists write it as Thymosin Alpha 1 peptides or peptide Thymosin Alpha 1 as well; every one of those is this record. A name is not a test, which is why the lot record further down counts for more than the wording on a label.
Chemically: molecular formula C129H215N33O55, average mass 3108.3 g/mol (PubChem CID 16130571). Those figures are what the identity test on a certificate is read against.
A 28-residue acetylated peptide originally isolated from thymic tissue; the pharmaceutical form is called thymalfasin.
Acts through Toll-like receptors on myeloid and plasmacytoid dendritic cells, initiating signalling that leads to production of immune-related cytokines. The mechanism is described as pleiotropic — it affects multiple immune cell subsets rather than acting on a single target.
Immune suppression associated with infection, cancer and ageing, and as a vaccine adjuvant. Registered and used in a number of countries; not approved in the United States.
No United States approval. Effects on immune cell subsets are better established than effects on clinical outcomes.
Thymosin Alpha 1 for sale: 5mg and 10mg vials, price per mg
Thymosin Alpha 1 cost, and Thymosin Alpha 1 price per mg by size
Thymosin Alpha 1 is sold in 2 sizes here, 5mg and 10mg, from $70.00 a vial. Thymosin Alpha 1 cost starts at that figure for the smallest vial, and the Thymosin Alpha 1 price per mg in the second column is the number to compare between sizes. The per-mg column is the honest comparison between sizes; the two tier columns show what ten and twenty vials of one size bill at, because the volume discount is per size and mixed sizes do not combine.
| Size | One vial | Per mg | 10 vials −10% | 20 vials −15% | Availability |
|---|---|---|---|---|---|
| Thymosin Alpha 1 5mg | $70.00 | $14.00 | $630.00$12.60/mg | $1,190.00$11.90/mg | Backordered — waitlist |
| Thymosin Alpha 1 10mg | $130.00 | $13.00 | $1,170.00$11.70/mg | $2,210.00$11.05/mg | Backordered — waitlist |
Thymosin Alpha 1 discounts: bulk pricing, Subscribe & Save, and codes
Three things move this price and nothing else does: how many vials of one size are on the order, whether that order repeats, and one code. The fourth column prices each route against the 5mg vial.
| Buying option | Takes off | When it applies | 5mg at this option |
|---|---|---|---|
| One vial, one time | — | Any order | $70.00 |
| 10–19 vials of one size | 10% | This order | $630.00$63.00 a vial |
| 20 vials of one size | 15% | This order | $1,190.00$59.50 a vial |
| Subscribe, every 1 month | 6% | Shipment 2 onward | First $70.00, then $65.80 |
| Subscribe, every 2 months | 4% | Shipment 2 onward | First $70.00, then $67.20 |
| Subscribe, every 3 months | 2% | Shipment 2 onward | First $70.00, then $68.60 |
| 10 vials on a monthly subscription | 10%, then 6% more | Shipment 2 onward | First $630.00, then $592.20 |
| Sign-up code | 10% of the order | One use, dead 24 hours after signup | $63.00 for one vial |
| Friday newsletter code | 5% of the order | Live 24 hours, a new one each Friday | $66.50 for one vial |
| On-site offer code | 5% of the order | Live 30 minutes from when it appears | $66.50 for one vial |
| Free standard shipping | The shipping charge | Orders over $200 | 3 vials |
The first three stack; the codes do not. A volume discount comes off the line, a subscription cadence comes off that same line from shipment 2, and one code comes off what is left. One code per order, never two. A subscription runs a minimum of two shipments and can be cancelled once the second has shipped, and the first shipment always bills at today's eligible price with no cadence discount on it. The lowest this record ever bills is $11.19 per mg: twenty 5mg vials on a monthly subscription, from shipment 2 onward.
Every figure above is what you pay; nothing is added at checkout — dispatch and delivery work the same on every order.
Where to buy Thymosin Alpha 1: five checks before you order from anyone
Where to get Thymosin Alpha 1, and how to buy Thymosin Alpha 1 online
Thymosin Alpha 1 for sale, or Thymosin Alpha 1 peptide for sale, means this page: one record, 2 sizes, a lot certificate for each. You can buy Thymosin Alpha 1 online here with guest checkout, and purchase Thymosin Alpha 1 or order Thymosin Alpha 1 in any size below; verified in-stock orders placed before 12 PM Pacific are dispatched the same day. A Thymosin Alpha 1 supplier, vendor or source worth using can show the same three things this page shows: the lot number, the certificate that carries it, and where to verify that certificate.
Run these on us too. A supplier who cannot pass them is asking you to take their word for it, and their word is the one thing a certificate exists to replace.
- Check the certificate on the lab’s own site, not ours.
- See whether it was written for the seller.
- Match the lot number on the paper to the one on the vial.
- Look for a method and a date next to every number.
- Make sure identity was tested, not assumed.
Each of those is worked through, with what a failed check actually looks like, on verifying a certificate.
Thymosin Alpha 1 nasal spray, capsules or oral form? What this vial is, and is not
Search results for Thymosin Alpha 1 also show nasal spray, capsules, oral form products, under listing titles such as thymosin alpha 1 nasal spray, thymosin alpha 1 capsules, thymosin alpha 1 oral, thymosin alpha 1 tablets, thymosin alpha-1 10mg vial. Those are finished consumer goods made and marketed by other companies, and none of them is what this page sells. This record is freeze-dried Thymosin Alpha 1 in a sealed glass vial, 5mg and 10mg, with a lot certificate, supplied for laboratory work.
The difference matters for the paperwork. A certificate on this page describes the powder in the vial: identity, purity and net content for one lot. It says nothing about a capsule, a spray or a cream, which carry other ingredients and sit under different rules. When a listing elsewhere borrows a lot report to vouch for a different product form, the report does not describe what is being sold.
Thymosin Alpha 1 vs TB-500 and Thymalin/Thymulin: different molecules, separate records
Thymosin Alpha 1 vs TB-500, or TB-500 vs Thymosin Alpha 1, is the comparison people search most, with Thymalin close behind, and they are not the same thing. Each is a different molecule with a different formula, mass and research record, and each has its own certificate here.
TB-500 vs Thymosin Alpha 1: the same comparison, side by side
| Record | Class | Formula | Avg. mass | Sizes here |
|---|---|---|---|---|
| Thymosin Alpha-1 | A 28-residue acetylated peptide originally isolated from thymic tissue; the pharmaceutical form is called thymalfasin. | C129H215N33O55 | 3108.3 | 5mg · 10mg from $70.00 |
| TB-500 | A man-made peptide matching a section of thymosin beta-4. | C38H68N10O14 | 889 | 5mg · 10mg from $54.00 |
| Thymalin/Thymulin | A product name covering two distinct substances: Thymalin, a thymus-derived peptide preparation from the Khavinson series, and thymulin, a characterised zinc-dependent nonapeptide thymic hormone. | C33H54N12O15 | 858.9 | 10mg from $80.00 |
Documentation compared in full: Thymosin Alpha 1 vs TB-500, side by side.
The Thymosin Alpha 1 certificate: lot, purity, identity, and how to verify it
A certificate answers identity, purity and net content as three separate questions, each with the method that produced it and the date it was run — how to read one covers what each field does and does not cover. For Thymosin Alpha 1 that means a mass spectrum landing on 3,108.3 g/mol for C129H215N33O55, the figure published against PubChem CID 16130571.
Listings elsewhere describe Thymosin Alpha-1 as an acetate, an arginate salt or an N-acetyl form. Those are different chemical forms with different masses, and a certificate identifies which one was actually tested. The form of the lot on this page is whatever its certificate states; it is not assumed from a listing name, ours included.
The certificate below belongs to one lot, and its number matches the one printed on the vial you receive. A real report for a different batch is still the wrong report.
| Size | Lot | Identity method | Purity | Test date |
|---|---|---|---|---|
| 5mg | Pending verification | Pending verification | Pending verification | Pending verification |
| 10mg | Pending verification | Pending verification | Pending verification | Pending verification |
No lot documentation is published for Thymosin Alpha-1 yet. Rather than display a placeholder certificate, this record shows the gap until each field has been verified against the lot in hand. The certificate index lists every lot the moment its report clears.
Solution arithmetic for the bench, with no administration guidance: the vial concentration calculator, preset to Thymosin Alpha-1.
Is Thymosin Alpha 1 legal? FDA status, and what this listing is
The FDA has not approved this compound for anything, and nothing in this catalogue is a medicine. Where a compound stands legally depends on what it is, what form it is in, what it is being used for and which country you are in, and it changes over time, so the status shown here carries the date it was last checked.
Status verified 2026-08-25. Regulatory positions move; check the primary source before relying on any summary, including this one.
Whether Thymosin Alpha 1 is legal depends on what it is being used for and where. It is sold here as laboratory material under the research-use restriction that closes this page, which is not an approval, and not a statement that the compound is safe, effective or right for any purpose. LabFirst is not a pharmacy or a compounding facility, this vial is not a compounded medicine, and no prescription is involved, because it is not sold for use in anyone.
Thymosin Alpha 1 research: what the published studies examine
Status: No FDA-approved application. This compound is sold as laboratory material. Where research on it has been published, it sits at the animal, cell or early-human stage, and this record does not summarise what it found. A supplier is not a neutral judge of evidence about its own catalogue.
Thymosin alpha 1 is a 28-residue peptide originally isolated from thymic tissue as the fraction responsible for restoring immune function in thymectomised mice — which is a clean origin story, because the assay defined the molecule rather than the other way round. Its mechanism is genuinely pleiotropic rather than lazily described as such: it acts through Toll-like receptors on both myeloid and plasmacytoid dendritic cells, and the downstream effect is activation of signalling pathways and cytokine production across multiple immune cell subsets.
That places it among the better-characterised immune peptides on this catalogue. It is worth distinguishing it clearly from the other thymic materials sold here — it is a single defined 28-residue sequence, unlike Thymalin, which is a tissue extract, and unlike thymulin, which is a zinc-dependent nonapeptide.
| Reported observation | Model | Source |
|---|---|---|
| Originally isolated from thymic tissue as the compound responsible for restoring immune function to thymectomised mice. It has a pleiotropic mechanism affecting multiple immune cell subsets involved in immune suppression, acting through Toll-like receptors in both myeloid and plasmacytoid dendritic cells, leading to activation of signalling pathways and initiation of immune-related cytokine production. | review of preclinical and clinical work | King and Tuthill, Immune modulation with thymosin alpha 1 treatment, Vitamins and Hormones (2016)Both authors were at SciClone Pharmaceuticals, which markets the compound. The mechanism description is standard; the therapeutic framing is not neutral. |
Open questions. The receptor-level mechanism is reasonably well described and the compound has a long history, but two things should temper how the evidence reads. The most accessible review is written by employees of the company that markets it, which does not make the mechanism wrong but does mean the therapeutic framing should be checked against independent sources.
And there is a persistent gap in this literature between demonstrated changes in immune cell subsets and demonstrated changes in clinical outcomes — measuring that lymphocyte populations shift is easier than showing that patients do better, and the first is much more consistently reported than the second. It is registered in a number of countries and not approved in the United States. As a defined 28-residue peptide it is at least analytically tractable, which is more than can be said for the thymic extracts sold alongside it.
Each row above describes an observation in the stated model. None of it describes what Thymosin Alpha-1 would do in a person or an animal outside that model, and none of it is a recommendation to use it for anything.
Questions about Thymosin Alpha 1
Where to buy Thymosin Alpha 1 Peptide, and can I get it online?
How much does Thymosin Alpha 1 Peptide cost?
What is the cheapest way to buy Thymosin Alpha 1 Peptide?
What is the FDA approval status of Thymosin Alpha 1?
What is Thymosin Alpha-1 used for?
Is Thymosin Alpha-1 legal?
Is Thymosin Alpha-1 available here as capsules, tablets or a nasal spray?
What is the difference between Thymosin Alpha-1 and TB-500?
How does Thymosin Alpha 1 work, and what does it do?
What does Thymosin Alpha 1 do?
Is Thymosin Alpha 1 fda approved?
How do I verify the certificate of analysis is real?
FOR LABORATORY AND IN-VITRO RESEARCH USE ONLY. NOT FOR HUMAN OR ANIMAL CONSUMPTION. NOT FOR PERSONAL, MEDICAL, DIAGNOSTIC, THERAPEUTIC, OR RECREATIONAL USE.
