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Research Use Only · Not for human or veterinary consumption.
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Certificates of Analysis
Every batch is tested by an independent laboratory before release.
Verify Batch. Lot-level COA, Batch DF/THY/062026. Check the batch number printed on your vial against the certificate below, which reports the tests run on it.
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What is Thymalin?
Thymalin is not a single peptide. It is a mixture of small protein fragments pulled out of calf thymus tissue, so it has no one chain, no one weight and no chemical formula, and two batches are not guaranteed to contain exactly the same mixture. The group that developed it says its active parts are two very short chains, one two links long called KE and another two links long called EW. Those two are sold here on their own as Vilon and Thymagen. A result found with one of those two is a result for that chain and not for this mixture, and the same holds the other way round.
Product information reviewed by Dr. Martina Rossi, PhD
Scientific Contributor and Reviewer · Reviewed
Thymalin Research & Reference
What Thymalin does in published studies, and how to work with it in the laboratory, are covered in full on two dedicated pages rather than summarised here, so neither the evidence nor the handling detail is cut short.
Technical Specs
Labeled quantity is net peptide content, not gross salt weight.
Thymalin Batch Results
Batch DF/THY/062026
- Laboratory
- Kovera Labs
- Certified
- August 13, 2026
- Sample
- 5 mg vial
- Report
- KVR-2026-FADCF5
An independent laboratory, Kovera Labs, tested a sample from this batch. These are the results on its certificate.
Purity
Pass99.369%
RP-HPLC, C18 column, 214 nm
Identity
PassConfirmed
LC-MS
Purity is an HPLC figure: the main peak’s share of everything the detector recorded at one wavelength. It’s not a weight. What a purity figure counts →
Check it with the lab. Kovera Labs’ verification page looks a certificate up by its report number. Product, batch, date and results should match this page.
Chromatogram
RP-HPLC · C18 · DAD 214 nm
Batch DF/THY/062026
- Laboratory
- Kovera Labs
- Certified
- August 13, 2026
- Sample
- 10 mg vial
- Report
- KVR-2026-E47251
An independent laboratory, Kovera Labs, tested a sample from this batch. These are the results on its certificate.
Purity
Pass99.726%
RP-HPLC, C18 column, 214 nm
Identity
PassConfirmed
LC-MS
Purity is an HPLC figure: the main peak’s share of everything the detector recorded at one wavelength. It’s not a weight. What a purity figure counts →
Check it with the lab. Kovera Labs’ verification page looks a certificate up by its report number. Product, batch, date and results should match this page.
Chromatogram
RP-HPLC · C18 · DAD 214 nm
Frequently Asked Questions
Is Thymalin third-party tested for purity?+−
Yes. Every batch of Thymalin is tested by an independent third-party laboratory using HPLC and MS-UPLC, confirming purity and mass identity before the batch is released. Pure Peptides does not test its own material.
Can I see the Certificate of Analysis before buying?+−
Yes. The Certificate of Analysis for the batch currently in stock can be viewed and downloaded directly on this page, before you place an order. Each certificate states the batch number, the measured purity, and the date of analysis, and can be verified independently with the issuing laboratory using the report number it carries.
What does "Research Use Only" mean?+−
It means Thymalin is supplied for in-vitro laboratory research and for no other purpose, and must not be administered to humans or animals. Thymalin is legal to purchase in the United States for in vitro and non-clinical laboratory research. It carries no FDA approval or therapeutic indication for human use. Thymalin is not a scheduled substance under the Controlled Substances Act. Sold strictly for qualified research use, not human or veterinary administration.
How is Thymalin shipped and stored?+−
Thymalin ships from US stock with cold-chain packaging and full tracking; orders placed before noon EST on business days are typically dispatched the same business day. On arrival, store the lyophilized powder at -20°C or below, dry and protected from light.
Why does this product have no sequence or molecular weight?+−
Thymalin is an extract rather than a synthesized peptide. It is a fraction of small polypeptides isolated from calf thymus tissue, so it contains several species rather than one, and no single sequence, molecular weight or molecular formula describes it. Its CAS number, 79621-14-0, identifies it by source and process instead. Batch-to-batch composition is not guaranteed to be identical.
Is Thymalin the same as Thymulin or Thymosin Alpha-1?+−
No. All three are separate. Thymulin is a defined nine-amino-acid peptide that is only active as a zinc complex. Thymosin Alpha-1 is a defined 28-amino-acid peptide with an acetylated N-terminus. Thymalin is neither of those; it is a polypeptide extract with no single structure. Research on any one of the three says nothing about the other two.
Peptide Bioregulators
Related Compounds
From the blog
Background and context on this compound.
Reviewed for scientific accuracy
Dr. Martina Rossi, PhD
PhD, Université Grenoble Alpes · Scientific Contributor and Reviewer
Dr. Rossi's doctoral research at Université Grenoble Alpes examined the vascular functions of bone morphogenetic proteins. Her peer-reviewed work spans cell and molecular biology, vascular biology, and gene therapy, in journals including Cardiovascular Research, Scientific Reports, and Brain Sciences. She reviews Pure Peptides' product, reference, and research pages for scientific accuracy against the sources they cite.