TB-500 (Thymosin Beta-4 Acetate) – 10mg | Research Peptide

Description

What is TB-500?

Thymosin beta-4 is a naturally occurring peptide of 43 amino acids and about 4,963 Da. Research suppliers sell it as TB-500, and some use that name for a shorter fragment instead, so compare the molecular weight when you compare listings. This listing is the full-length acetate, and the specification table below gives its mass and formula.

TB-500 specifications

Compound	Thymosin beta-4 acetate (TB-500)
Size	10mg
Form	Lyophilized powder
Molecular weight	4,963.44 Da
Formula	C212H350N56O78S
CAS number	77591-33-4
Solubility	Water-soluble

Lot testing and COA

The latest published report is for lot 2026-08-05: 99.84% purity by HPLC-UV-MS and a negative endotoxin result, tested by MZ Biolabs. The certificate links to the laboratory’s own report, so you can check it without relying on us.

TB-500 10mg COA · COA Library

Ordering

Orders placed on peptryn.com ship from the USA with same-day dispatch, and shipping is free on orders over $150. For a question about a lot or a size, email [email protected].

Storage

Store lyophilized powder at -20°C, protected from light and repeated freeze-thaw cycles.

Frequently asked questions

What is TB-500?

TB-500 is Peptryn’s name for thymosin beta-4 acetate, a naturally occurring 43-amino-acid peptide, about 4,963 Da. Peptryn supplies it as a 10mg lyophilized laboratory material.

What purity is Peptryn’s TB-500?

Peptryn’s TB-500 is verified at 99.84% purity by HPLC-UV-MS, tested by MZ Biolabs (lot 2026-08-05). Read the COA. HPLC purity is area percent, the share of the main peak among all detected peaks; see our guide to peptide purity for what that means.

How is TB-500 stored?

Store lyophilized powder at -20°C, protected from light and repeated freeze-thaw cycles.

What is TB-500’s CAS number?

TB-500’s CAS number is 77591-33-4. Molecular weight: 4,963.44 Da.

Is TB-500 for human use?

No. Peptryn sells it for laboratory research only, and it is not approved for human or veterinary use. We do not give dosing or administration guidance.

Is TB-500 the same as BPC-157?

No. They are different peptides. TB-500 is thymosin beta-4, with 43 amino acids and a mass near 4,963 Da. BPC-157 has 15 amino acids and a mass near 1,419.5 Da. They are often blended and discussed together. Our Wolverine peptide guide covers the blend.

Related: Wolverine peptide guide · What is a COA? · Peptide testing · Popular peptides

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For laboratory research use only. Not for human or veterinary use, and not a drug, food, dietary supplement or cosmetic. You must be 21 or older to buy.