TB-500 (Long Chain)
This product is for laboratory research use only. Not for human or veterinary use. Not a drug, supplement, or medical device.
TB-500 (Long Chain) is supplied by Bench Grade Peptides as a lyophilized powder in a sealed, lot-numbered vial, for laboratory research use only — not for human or veterinary use.
Its published Certificate of Analysis (lot 00011/0011, analyzed September 3, 2026) is from AV Analytics, a third-party laboratory, and reports 99.72% purity by HPLC; every published lot is listed on the product's COA page. Vials ship at ambient temperature in protective packaging from Florida (Bench Grade Peptides LLC is registered in Dover, Delaware), with storage notes on the lot's certificate.
Under the Bench Grade Guarantee, if an ISO 17025-accredited US laboratory of the buyer's choosing reports a result that disagrees with the published Certificate of Analysis, Bench Grade refunds the order and shipping to the original payment method and pays the lab fee plus $100 separately, by a payment method arranged with the buyer.
Certificate of analysis
Independent laboratory report.
- Report sample
- 10 mg
- Purity (HPLC)
- 99.72%
- Batch
- 00011/0011
- Laboratory
- AV Analytics
- Analyzed
- Sep 3, 2026
This certificate documents the sample and batch shown above. Match the report to your vial label; contact us if you need a different size or lot. All lots for this product.
Overview
Synthetic acetylated thymosin-β4 (1-43) analog. Studied in tissue-regeneration research.
Read the full TB-500 (Long Chain) compound profile — mechanism, published research, and references →
- Sequence
- N-Ac-SDKPDMAEIEKFDKSKLKKTETQEKNPLPSKETIEQEKQAGES
- Purity spec
- ≥ 99.0%
- Form
- Lyophilized powder
CAS 77591-33-4 · 4963.44 g/mol · Purity specification: ≥99% by HPLC · $76.00–$106.00 depending on selected option
Molecular data
- CAS number
- 77591-33-4
- Mol. formula
- C212H350N56O78S
- Mol. weight
- 4963.44 g/mol
- Sequence
- N-Ac-SDKPDMAEIEKFDKSKLKKTETQEKNPLPSKETIEQEKQAGES
- Purity
- ≥ 99.0%
- Lot number
- Assigned at shipment
Research context
Goldstein et al., Ann NY Acad Sci (2012).
Published research
Primary literature on this compound — trial design, endpoints and limitations. Summaries, not recommendations.
- Thymosin beta 4 improves dermal burn wound healing via downregulation of receptor of advanced glycation end products in db/db miceBiochim Biophys Acta · 2014 · animal study · PMID 25230158 · DOI 10.1016/j.bbagen.2014.09.005
- Thymosin beta 4 and a synthetic peptide containing its actin-binding domain promote dermal wound repair in db/db diabetic mice and in aged miceWound Repair Regen · 2003 · animal study · PMID 12581423 · DOI 10.1046/j.1524-475x.2003.11106.x
- Thymosin beta 4 promotes corneal wound healing and decreases inflammation in vivo following alkali injuryExp Eye Res · 2002 · animal study · PMID 11950239 · DOI 10.1006/exer.2002.1170
- Thymosin beta4 accelerates wound healingJ Invest Dermatol · 1999 · animal study · PMID 10469335 · DOI 10.1046/j.1523-1747.1999.00608.x
From the journal
Storage & handling
Lyophilized TB-500 (Long Chain) is shipped at ambient temperature in protective packaging. For long-term laboratory storage, keep vials sealed at –20°C, and where your lot's Certificate of Analysis is published, follow its storage notes.
Handling & reference
- TB-500 and thymosin beta-4 — what you are actually buyingTB-500 and thymosin beta-4 are used interchangeably by suppliers but originally named different molecules. How to tell from the COA which one is in the vial.
- Choosing a US peptide supplier — what separates themWhat separates suppliers when everyone's website says the same thing: where the material is made, who tests it, and what they will put in writing.
- Peptide purity thresholds — 95%, 98%, 99% and what each is good forWhat HPLC area-percent purity levels actually mean for downstream applications, why "higher is better" is not always true, and the cost trade-offs.
- A Certificate of Analysis in your name — what it coversA re-issued COA changes whose letterhead the data appears on. It does not change the data, the lot, or who performed the analysis — and claiming otherwise is where operators get into trouble.
About TB-500 (Long Chain)
- What is TB-500 (Long Chain)?
- Synthetic acetylated thymosin-β4 (1-43) analog. Studied in tissue-regeneration research.
- What is the CAS number for TB-500 (Long Chain)?
- TB-500 (Long Chain) is registered under CAS Registry Number 77591-33-4.
- What is the molecular formula of TB-500 (Long Chain)?
- The molecular formula of TB-500 (Long Chain) is C212H350N56O78S, with a molecular weight of 4963.44 g/mol.
- Which laboratory issued the published certificate for TB-500 (Long Chain)?
- The published certificate from AV Analytics records the analysis for the product and batch named in that document. Refer to the report for the tests performed and results; it does not establish testing for every vial size or shipping lot.
Before you order
- Independent report available. Lot 00011/0011 · 99.72% purity by HPLC · AV AnalyticsView the COA →
- UPS Ground ships free on 3 or more vials or on orders of $100 or more, UPS 2-Day at $250 or more and UPS Next Day Air at $600 or more (products after discounts; water does not count). Below those, UPS Ground is $20, UPS 2-Day $15 and UPS Next Day Air $60. Order by 2 PM ET on a business day and it ships the same day.Shipping →
- If a third-party lab disagrees with our COA, full refund plus $100.Guarantee →
- Pay by card.Payments →
- Made in the USA. Synthesized in an ISO-7 cleanroom. Match any laboratory report to the product and lot on your vial.Facility →
- Synthesized at a US facility in an ISO-7 certified cleanroom; filled and finished by a cGMP-certified US manufacturing partner.
- Secure facility with 24-hour CCTV cold-chain storage and time-locked chain-of-custody protocols.
- The published certificate from AV Analytics records the analysis for the product and batch named in that document. Refer to the report for the tests performed and results; it does not establish testing for every vial size or shipping lot.
- Open the published Certificate of Analysis below and match its product, vial size and batch to your vial. Contact us if you need help confirming the applicable report.
- US-domestic shipping only · Free UPS Ground on 3+ vials or $100+ · 2-Day $15, free at $250+.
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