Coming soon

Thymosin Alpha-1 Peptide

Thymosin Alpha-1 (thymalfasin)

Coming soon. Thymosin Alpha-1 is not listed by a brand yet. Read the specs and research guide below, and join the Researcher Club to hear when it arrives.

CAS: 62304-98-7
Molecular weight: 3108.27 g/mol
Length: 28 amino acids

Read the research guide Browse compounds in stock

Thymosin Alpha-1 research guide · Updated 24 Oct 2026

What is Thymosin Alpha-1?

Thymosin alpha-1 is a 28 amino acid peptide, acetylated at its N terminal end, that comes from the larger protein prothymosin alpha. It was first isolated from thymus tissue, and its international name is thymalfasin. It is studied in immune system research. It is supplied as a lyophilized powder for in vitro and preclinical laboratory research only.

Full specifications

Sequence: Ac-Ser Asp Ala Ala Val Asp Thr Ser Ser Glu Ile Thr Thr Lys Asp Leu Lys Glu Lys Lys Glu Val Val Glu Glu Ala Glu Asn
Length: 28 amino acids
CAS number: 62304-98-7
Molecular formula: C129H215N33O55
Molecular weight: 3108.27 g/mol
Form: White lyophilized powder
Purity standard: 99% or higher (brand listing)
Storage: Before reconstitution 2 to 8 °C, dry and away from light. After reconstitution 2 to 8 °C, use within 28 days.

How Thymosin Alpha-1 is tested

A good Thymosin Alpha-1 listing comes with a lab report for the exact lot in the vial. These are the results to look for:

Purity (HPLC)
How much of the sample is the compound
Identity (MS or LCMS)
Confirms it is the right molecule
Net content
The real mg in the vial versus the label
Endotoxin (LAL)
Bacterial residue, reported in EU
Sterility
Confirms nothing is growing in the vial
Heavy metals (ICP-MS)
Arsenic, cadmium, lead and mercury

Storage and handling

Keep Thymosin Alpha-1 vials at 2 to 8 °C, dry and away from light, before reconstitution. Once reconstituted for laboratory use, store at 2 to 8 °C and use within 28 days.

Thymosin alpha-1 vs TB-500

Despite the shared name, thymosin alpha-1 and TB-500 (thymosin beta-4) are unrelated peptides with different sequences. Thymosin alpha-1 has 28 amino acids. Thymosin beta-4 has 43.

Compound TB-500 Lab reports and price per mg by brand Read more → Compound KPV Lab reports and price per mg by brand Read more →

When Thymosin Alpha-1 will be available

Thymosin Alpha-1 is coming soon to Online Peptide Market. When a brand lists it, this page will show its sizes, price per mg, shipping terms and the lab report for the lot. Join the Researcher Club to hear when it arrives.

Questions and answers

Thymosin Alpha-1 questions, answered

Where can I buy Thymosin Alpha-1?

Thymosin Alpha-1 is coming soon to Online Peptide Market. Join the Researcher Club to hear as soon as a brand lists it, with its lab report, price per mg and shipping terms.

Is the Thymosin Alpha-1 third-party tested?

Thymosin Alpha-1 is coming soon. When a brand lists it, the lab report for its lot will appear on this page.

Is thymosin alpha-1 FDA approved?

No. Thymalfasin is not approved by the FDA in the United States, although it has been approved as a prescription drug in some other countries. The thymosin alpha-1 sold here is research grade material for laboratory use only and is not for human use.

How should Thymosin Alpha-1 be stored?

Before reconstitution, keep vials at 2 to 8 °C, dry and away from light. Once reconstituted for lab use, store at 2 to 8 °C and use within 28 days.

What does research use only mean?

Products are sold only for in vitro laboratory research. They are not drugs, supplements or cosmetics, are not FDA approved, and are not for human or veterinary use. Buyers must be 21 or older.

Often compared with Thymosin Alpha-1