Thymalin is a product name covering two distinct substances: Thymalin, a thymus-derived peptide preparation from the Khavinson series, and thymulin, a characterized zinc-dependent nonapeptide thymic hormone. These are not the same thing (formula C33H54N12O15, average mass 858.9 g/mol, CAS 78922-62-0). Thymalin/Thymulin is sold here for laboratory research in 1 size (10mg), from $80.00 a vial. It is not an FDA-approved medicine. Research use only, and never for people or animals.
Thymalin specifications
| Product name | Thymalin/Thymulin |
|---|---|
| Also sold as | Thymalin/Thymulin |
| Formula | C33H54N12O15 |
| Average mass | 858.9 g/mol |
| CAS number | 78922-62-0 |
| Physical form | Freeze-dried powder, a solid cake in a sealed vial |
| Appearance | White to off-white cake |
| Sizes on this page | 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 | Tested by Kovera Labs; each lot's certificate posts here when it is reported |
| Storage | Sealed, cold and out of the light |
| Ships from | Santa Ana, California by USPS with tracking on every order, same business day on verified in-stock orders placed before 12 PM Pacific |
| Regulatory status | Not an FDA-approved drug product. Sold as laboratory material, not a medicine; status verified 2026-08-25. |
| Intended use | Laboratory research only. Not for human or animal use. |
What is Thymalin, and what is it used for?
Thymalin is also listed and searched as Thymalin/Thymulin. They all mean the same compound. Supplier lists write it as Thymalin peptides or peptide Thymalin 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 C33H54N12O15, average mass 858.9 g/mol (PubChem CID 71300623). Those figures are what the identity test on a certificate is read against.
A product name covering two distinct substances: Thymalin, a thymus-derived peptide preparation from the Khavinson series, and thymulin, a characterized zinc-dependent nonapeptide thymic hormone. These are not the same thing.
Depends entirely on which substance is in the vial. Thymulin has a defined mechanism as a zinc-dependent thymic hormone produced by thymic epithelial cells, with biological activity strictly requiring bound zinc. Thymalin is a peptide preparation extracted from thymus tissue rather than a single defined molecule, and has no established mechanism.
Thymulin appears in a mainstream international immunology literature dating from the 1970s and 1980s. Thymalin appears in the Russian bioregulator literature, principally around immune parameters in ageing.
Which substance a vial under this name contains is not established by the name. No approved product exists under either name in the United States or European Union, and for a preparation rather than a defined molecule, purity and identity testing cannot mean what it means for a single compound.
Thymalin for sale: 10mg vials, price per mg
Thymalin is sold in 1 size here, 10mg, from $80.00 a vial. Every way of buying is in the table; the per-mg figure under each price is the one that compares across sizes.
Volume and subscription pricing by size
| Size | One vial | 10–19 vials−10% | 20 vials−15% | Subscribe monthly−6% from shipment 2 | Availability |
|---|---|---|---|---|---|
| Thymalin 10mg | $80.00$8.00/mg | $72.00a vial · $7.20/mg | $68.00a vial · $6.80/mg | $75.20a vial, shipment 2 on · $7.52/mg | Backordered — waitlist |
Volume tiers are per size and do not combine across sizes (see bulk pricing). Subscribe & Save takes 6% every month, 4% every 2 months or 2% every 3 months off from shipment 2, two shipments minimum, and stacks on the volume tier: the lowest this record ever bills is $6.39 per mg, twenty 10mg vials on a monthly subscription from shipment 2 onward.
Nothing is added at checkout except the USPS shipping you choose; dispatch and delivery are the same on every order. The cost-per-milligram tool ranks the whole catalog by price per mg.
Where to buy Thymalin: what to check before you order from anyone
Thymalin for sale, or Thymalin peptide for sale, means this page: one record, 1 size. You can buy Thymalin online here with guest checkout; verified in-stock orders placed before 12 PM Pacific are dispatched the same day.
Before ordering Thymalin from anyone, us included, run the 5 checks on verifying a certificate; the first is that the report resolves on the laboratory's own site, and a seller who cannot pass them is asking for the trust a certificate exists to replace.
Thymalin vs Epithalon and Thymosin Alpha-1: different molecules, separate records
Thymalin vs Epitalon, or Epitalon vs Thymalin, is the comparison people search most, with Thymosin Alpha 1 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.
Epitalon vs Thymalin: the same comparison, side by side
| Record | Class | Formula | Avg. mass | Sizes here |
|---|---|---|---|---|
| Thymalin/Thymulin | A product name covering two distinct substances: Thymalin, a thymus-derived peptide preparation from the Khavinson series, and thymulin, a characterized zinc-dependent nonapeptide thymic hormone. | C33H54N12O15 | 858.9 | 10mg from $80.00 |
| Epithalon | A man-made peptide of four building blocks. | C14H22N4O9 | 390.35 | 10mg · 50mg from $40.00 |
| 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 |
The Thymalin 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 Thymalin that means a mass spectrum landing on 858.9 g/mol for C33H54N12O15, the figure published against PubChem CID 71300623.
Listings elsewhere describe Thymalin/Thymulin 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.
Thymalin/Thymulin certificates post here and in the certificate index when Kovera Labs reports on the lot.
Solution arithmetic for the bench, with no administration guidance: the vial concentration calculator, preset to Thymalin/Thymulin.
Thymalin 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 summarize what it found. A supplier is not a neutral judge of evidence about its own catalog.
The most important thing on this page is that the label covers two different substances. Thymulin is a nonapeptide hormone produced by thymic epithelial cells whose biological activity is strictly dependent on zinc bound within the molecule — antibody and NMR work established that the zinc-coupled form has a distinct conformation, and antibodies raised against it discriminate between the zinc-bound and zinc-free molecule. That is characterized pharmacology from mainstream immunology.
Thymalin is something else: a peptide preparation extracted from thymus tissue in the Khavinson series, a mixture rather than a single sequence, with the same provenance limitations as the rest of that series. A defined nonapeptide and a tissue extract are not interchangeable, and no certificate of analysis can resolve the ambiguity created by putting both names on one product — a purity figure for a mixture does not mean what a purity figure for a single peptide means.
| Reported observation | Model | Source |
|---|---|---|
| Thymulin is a nonapeptide produced by thymic epithelial cells whose biological activity is strictly dependent on the presence of zinc in the molecule. Monoclonal antibodies raised against synthetic and natural forms recognized exclusively the zinc-coupled molecule, while other antibodies recognized a zinc-independent epitope, indicating a zinc-specific conformation consistent with NMR studies. | monoclonal antibody and immunofluorescence characterization, human and mouse thymic epithelial cells | Dardenne, Savino, Berrih and Bach, A zinc-dependent epitope on the molecule of thymulin, a thymic hormone, Proceedings of the National Academy of Sciences (1985)This describes THYMULIN, the defined hormone — not Thymalin, the extract. |
| The originating review of the Khavinson series describes Thymalin as a thymic peptide preparation whose most prominent reported effects relate to stimulation of immunity, associated in that work with anticarcinogenic and geroprotector activity. | review of the originating group's own work | Khavinson, Peptides and Ageing, Neuroendocrinology Letters (2002)This describes THYMALIN, the preparation — not thymulin. The two literatures do not overlap. |
Open questions. Start with the ambiguity, because it is not a labeling quibble. Thymulin is a defined nonapeptide requiring bound zinc for activity; Thymalin is a tissue-derived preparation. They have separate literatures, separate origins and separate degrees of characterization, and a buyer cannot tell from this name which they are getting. Anyone purchasing under this label should establish which substance is intended before anything else, and should understand that if it is the preparation, identity and purity testing cannot answer the same question it answers for a single compound.
Beyond that, the thymulin literature is largely from the 1970s and 1980s and its zinc dependence means the peptide alone, absent zinc, is not the active species — a point that bears directly on what a vial of lyophilized peptide actually contains. The Thymalin literature carries the provenance limitations of the whole Khavinson series.
Each row above describes an observation in the stated model. None of it describes what Thymalin/Thymulin would do in a person or an animal outside that model, and none of it is a recommendation to use it for anything.
How to store Thymalin: refrigeration and shelf life
Keep the sealed vial cold and out of the light and it stays as it left the lab. Once it is mixed into a solution, how long it holds up depends on the compound, what it was mixed with, how strong the solution is and how cold it is kept — too many variables for anyone to print one shelf life on a label. So laboratories write the date on whatever they prepare and keep their own record of it.
For solution preparation arithmetic on the bench, concentration, per-graduation values and molarity, use the vial concentration calculator, which opens with the Thymalin/Thymulin sizes stocked here already loaded. It covers laboratory measurement only and contains no administration guidance.
