TB-500
Synthetic 43-residue peptide supplied by Loti Labs as lyophilized powder for laboratory research. Specifications, the current certificate of analysis and the full batch history, all on one page.
Thymosin Beta 4 (TB-500) 2mg. For laboratory, analytical and research use only.Compound specifications
2 mg vial
| Compound | Thymosin beta-4 (TB-500) |
| Class | Synthetic 43-residue peptide |
| Molecular formula | C212H350N56O78S |
| Molecular weight | 4963 g/mol |
| CAS number | 77591-33-4 |
| Form | Lyophilized powder, sealed vial |
5 mg vial
| Compound | Thymosin beta-4 fragment (TB-500) |
| Class | Synthetic 7-residue fragment |
| Sequence | Ac-LKKTETQ |
| Molecular formula | C38H68N10O14 |
| Molecular weight | 889.0 g/mol |
| Form | Lyophilized powder, sealed vial |
Latest certificates of analysis
5 mg vial
Also in these research blends
BPC-157 5mg / TB-500 5mg (blend)
Klow Blend 80mg (GHK-Cu 50mg, BPC-157 10mg, TB-500 10mg, KPV 10mg)
Glow Blend 70mg (GHK-CU 50mg, BPC-157 10mg, TB-500 10mg)
Batch history
| Test date | Format | Batch | Purity | Identity | Laboratory | |
|---|---|---|---|---|---|---|
| Oct 12, 2026 | 5 mg vial | LL-TB5-926 | >99.9% | Confirmed | Krause Analytical | Certificate |
| Jun 29, 2026 | 5 mg vial | COA5744 | 99.8% | Confirmed | Bioviridian | Certificate |
| Feb 2, 2026 | 2 mg vial | LLTB2226 | 99.87% | SR Bio Labs | Certificate |
How every batch is tested
Every Loti Labs batch is tested by an independent, U.S.-based third-party laboratory. Purity is measured by HPLC and identity is confirmed by mass spectrometry. Where a certificate includes an endotoxin screen, the result is shown above. Each certificate is archived permanently under its batch number, so earlier batches stay on record after a new one arrives. Search the complete COA archive.
Questions researchers ask
What purity is the current TB-500 batch?
2 mg vial: batch LLTB2226 tested at 99.87% purity by HPLC on Feb 2, 2026. 5 mg vial: batch LL-TB5-926 tested at >99.9% purity by HPLC-UV/MS on Oct 12, 2026, identity confirmed by mass spectrometry.
What is the molecular formula and weight of Thymosin beta-4 (TB-500)?
Thymosin beta-4 (TB-500) has molecular formula C212H350N56O78S and a molecular weight of 4963 g/mol, CAS 77591-33-4.
How do I find the certificate for my vial?
Match the lot number printed on the vial label to the batch column in the history table, or search it in the Loti Labs COA archive. Every certificate is kept permanently under its batch number.
What is TB-500 from Loti Labs intended for?
Loti Labs supplies TB-500 strictly for laboratory, analytical and research use. It is not for human or veterinary use, and it is not a drug, food or cosmetic.
Available to registered researchers
Ordering opens after you sign in or create a free research account.
RESEARCH USE ONLY. This page is provided for laboratory, analytical and research reference. Products are not drugs, foods or cosmetics and are not for human or veterinary use.