BPC & Thymosin Peptides Low Stock

CAS77591-33-4

FormulaC212H350N56O78S

Mol. weight4963.44 Da

Quantity10mg/vial

Purity99.2% HPLC

IdentityConfirmed

ReportBy email on request

StockIn stock

TB-500 10mg

Name: TB-500 10mg
Brand: Pepta Labs
SKU: tb-500-10mg
Price: 56.73 USD
Availability: InStock

Thymosin beta-4, Timbetasin, Tbeta4, Thymosin beta4 acetate, TB4 · CAS 77591-33-4

This listing is TB-500 10mg for sale from Pepta Labs: one sealed glass vial holding a supplier-stated 10 mg of full-length, N-acetylated thymosin beta-4 (timbetasin) as dry lyophilized powder, typically as the acetate salt. The 10 mg vial is the only single-compound TB-500 listing Pepta Labs carries; larger quantities are ordered as multi-vial packs of this 10 mg vial. The HPLC purity and mass-spectrometry identity report for the sampled production run is sent by email on request, before you order if you want to see it: request it on this page or email support@peptalabs.com.

TB-500 10mg: $56.73 per vial ($5.67 per mg of the supplier-stated 10 mg). Ships to US addresses only. TB-500 10mg (Thymosin Beta-4 (Timbetasin)) is a lyophilized research peptide supplied as 10mg of dry powder per sealed vial. CAS 77591-33-4; molecular formula C212H350N56O78S; molecular weight 4963.44 Da. Purity is reported as 99.2% by reversed-phase HPLC and identity is confirmed by mass spectrometry; the analytical report is available by email. Supplied for laboratory research use only.

99.2% pure Identity confirmed

$56.73

$5.67 per mg

Free US shipping · Most orders ship the next business day

Pack size and price

Quantity

Checkout uses a free account with a confirmed email.

Code FALL25: 25% off at checkout.

Free US shipping, no minimum

Most orders ship the next business day as dry powder at ambient temperature. Unopened products in original sealed condition may be returned within 30 days of delivery with return authorization.

Report by email before you order

Independent HPLC purity and MS identity report on request. Pepta Labs does not test in-house.

Payment methods

Pepta Labs accepts Cash App, Venmo, Zelle, Bitcoin and Ethereum (5% crypto discount). Payment instructions are emailed as soon as you place your order.

Research use only

Not for human or animal use. Certified at checkout from a registered account.

Specifications

TB-500 10mg at a glance

TB-500 10mg is supplied as lyophilized powder in a sealed glass vial for laboratory research only. It is not for human or animal use, consumption, administration, diagnosis or treatment.

Full name: Thymosin Beta-4 (Timbetasin)
Quantity: 10mg/vial
CAS number: 77591-33-4
Molecular formula: C212H350N56O78S
Molecular weight: 4963.44 Da
Sequence: Ac-Ser-Asp-Lys-Pro-Asp-Met-Ala-Glu-Ile-Glu-Lys-Phe-Asp-Lys-Ser-Lys-Leu-Lys-Lys-Thr-Glu-Thr-Gln-Glu-Lys-Asn-Pro-Leu-Pro-Ser-Lys-Glu-Thr-Ile-Glu-Gln-Glu-Lys-Gln-Ala-Gly-Glu-Ser-OH (Ac-SDKPDMAEIEKFDKSKLKKTETQEKNPLPSKETIEQEKQAGES-OH)
Purity: 99.2% by HPLC
Identity: Confirmed by mass spectrometry
Physical form: Lyophilized (freeze-dried) powder, sealed glass vial
Report: Sent by email on request, before you order if you want to see it first.
Not claimed: Sterility, endotoxin or LAL, potency, pharmaceutical-grade, cGMP, contaminant-panel or vial fill-quantity testing
Category: BPC & Thymosin Peptides

Chemical identity

What TB-500 is

TB-500 is the designation under which Pepta Labs lists synthetic thymosin beta-4 (INN/USAN timbetasin), a 43-residue linear peptide carrying an N-terminal acetyl group: Ac-Ser-Asp-Lys-Pro-Asp-Met-Ala-Glu-Ile-Glu-Lys-Phe-Asp-Lys-Ser-Lys-Leu-Lys-Lys-Thr-Glu-Thr-Gln-Glu-Lys-Asn-Pro-Leu-Pro-Ser-Lys-Glu-Thr-Ile-Glu-Gln-Glu-Lys-Gln-Ala-Gly-Glu-Ser-OH. The molecular formula is C212H350N56O78S with a molecular weight of about 4963.4 g/mol (site value 4963.44 Da), CAS 77591-33-4, UNII 2D5MRE3SSY and PubChem CID 16132341. Some databases apply the name TB-500 to a shorter acetylated heptapeptide fragment (Ac-Leu-Lys-Lys-Thr-Glu-Thr-Gln, C38H68N10O14, 889.0 g/mol); the CAS number, formula and mass on the Pepta Labs listing correspond to the full-length 43-residue peptide. The peptide is supplied as a lyophilized powder in a sealed glass vial (10 mg quantity), typically as an acetate salt, with reported RP-HPLC purity and mass-spectrometric identity. Store at 2-8 C on arrival or at -20 C for long-term storage, protected from light and moisture. Laboratory research use only.

Also known as: Thymosin beta-4, Timbetasin, Tbeta4, Thymosin beta4 acetate, TB4
Structural class: synthetic linear 43-residue polypeptide, N-terminally acetylated, free C-terminal acid
Residues: 43 amino acids
Salt form: typically supplied as acetate salt
PubChem CID: 16132341
UNII: 2D5MRE3SSY

Handling

Storage, form and restrictions

Shipping: Ships at ambient temperature with no cold pack and no insulated packaging. No cold chain is required for dry powder.
Storage: Refrigerate at 2–8°C on arrival, or hold at −20°C for long-term storage. Keep sealed vials away from light and moisture.
Research use only: Offered solely for laboratory research. Not for human or animal use, consumption, administration, diagnosis or treatment. See the research use policy.

Documentation

Before you order

What are research peptides? TB-500 in 2026: FDA List Status, Full-Length Thymosin Beta-4 vs the LKKTETQ Fragment, CAS and Expected Mass Mass Spectrometry Identity Confirmation of Research Peptides: ESI, MALDI and Observed vs Calculated Mass Is Thymosin Alpha-1 the Same as TB-500 or Thymulin? Sequences, CAS Records and Salt Form Peptide Sciences Shut Down (March 2026): Status and Listings All BPC & Thymosin Peptides compounds How to Read a Peptide COA HPLC and Mass Spectrometry

Questions

TB-500 10mg — common questions

How do I buy TB-500 10mg online?

Choose one vial or a multi-vial pack on this page, add it to the cart and check out from a free Pepta Labs account with a confirmed email. Orders ship to US addresses only with free US shipping, buyers must be 21 or older, and each buyer certifies laboratory research use at checkout.

Is TB-500 sold in 5 mg or 20 mg vials?

No. Pepta Labs currently lists TB-500 as a single-compound listing in one size, the 10 mg vial on this page. For more material, order two or more 10 mg vials; the pack options and their prices are shown in the pack selector above.

What is in a TB-500 10mg vial as supplied?

A supplier-stated 10 mg of TB-500 as a dry, freeze-dried powder in a sealed glass vial, typically as the acetate salt. A peptide salt also carries its counter-ion and some residual water, so net peptide content can differ from the gross powder weight; net peptide content is not reported per listing, and vial fill-quantity testing is not claimed.

How do I get the TB-500 COA before ordering?

Request it on this page or email support@peptalabs.com with the name TB-500 10mg. The report covers the sampled production run and shows RP-HPLC purity as area-% and mass-spectrometry identity; vials carry no lot number, so it is not a lot-specific certificate. On the report, compare the observed mass with the 4963.44 Da stated on this listing. Because testing is commissioned by the purchasing group, the client field may name the group or source rather than Pepta Labs.

How should sealed TB-500 powder be stored?

Keep the sealed vial at 2-8 C on arrival, or at -20 C for long-term storage, dry and away from light. The TB-500 sequence contains one methionine (Met6), which can oxidize to methionine sulfoxide and appear as a +16 Da peak on a mass spectrum, so limiting air, moisture and light exposure keeps the powder closer to the state described in the sampled-run report.

Which Pepta Labs guide explains TB-500 in more depth?

The Learn guide on TB-500 identity sets out the full-length sequence, molecular weight, CAS number and the LKKTETQ fragment; the guide Peptide Registry Records: When PubChem, CAS and a Listing Disagree explains why PubChem applies the name TB-500 to a seven-residue fragment; and How to Read and Verify a Peptide Certificate of Analysis walks through the report itself.

What does TB-500 10mg cost?

TB-500 10mg starts at $56.73 per vial. 3-vial packs are 10% off and 5-vial packs are 15% off. US shipping is free with no minimum.

What payment methods are accepted?

Pepta Labs accepts Cash App, Venmo, Zelle, Bitcoin and Ethereum (5% crypto discount). Payment instructions are emailed as soon as you place your order.

Is this for human or animal use?

No. TB-500 10mg is offered solely for laboratory research and is not for human or animal use, consumption, administration, diagnosis or treatment. Buyers certify this at checkout.

Is TB-500 the same as thymosin beta-4?

On the Pepta Labs listing, yes: the stated CAS 77591-33-4, formula C212H350N56O78S and mass 4963.44 Da are those of full-length, N-acetylated thymosin beta-4 (timbetasin, 43 residues). Note that PubChem resolves the bare name TB-500 to a 7-residue acetylated fragment (Ac-LKKTETQ, 889.0 g/mol), so the CAS and mass on the analytical report are the reliable identifiers.

What does the acetyl group in the sequence mean?

The N-terminal serine is acetylated (Ac-Ser), so the peptide has no free N-terminal amine. This adds 42.01 Da relative to the unmodified sequence and is included in the formula C212H350N56O78S.

How is the identity of a 4963 Da peptide confirmed?

By mass spectrometry, which for a peptide of this size typically shows multiply charged ions (for example [M+4H]4+ and [M+5H]5+) that deconvolute to the expected monoisotopic or average mass, together with RP-HPLC retention time and purity.

All BPC & Thymosin Peptides compounds →