TB-500
We've tested 62 samples of TB-500 sourced from 9 vendors between 16 May 2025 and 19 Mar 2026. Purity typically ranges from 82.88% to 99.95% (5th-95th percentile), and quantity typically diverges by up to +/-100% vs advertised value (95th percentile).
Take Action
Suggest A Vendor
Test TB-500
Mail in a sample for free testing (US only, terms apply)
Vendors
| Tests | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Vendor | Rating | Count | Avg | Min | Max | Oldest | Most Recent | ||
 | 11 | 30 Jan 2026 | 4 Mar 2026 | ||||||
 | 2 | 9 Jan 2026 | 7 Mar 2026 | ||||||
| 7 | 9 Sep 2025 | 6 Feb 2026 | ||||||
| 8 | 24 Jul 2025 | 4 Mar 2026 | ||||||
 | 8 | 16 May 2025 | 30 Jan 2026 | ||||||
 | 14 | 29 Jun 2025 | 2 Mar 2026 | ||||||
| 4 | 9 Oct 2025 | 29 Dec 2025 | ||||||
| 5 | 4 Aug 2025 | 29 Jan 2026 | ||||||
| 3 | 24 Jul 2025 | 9 Sep 2025 | ||||||
Most recent TB-500 tests
Samples are tested in commercial labs
| Quantity | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Test Date | Vendor | Certificate | Variant | Test Score | Label | Tested | Difference | Purity | Endotoxins | Batch ID | Container | Tested At | Sent By |
| 7 Mar 2026 | Yabang Peptide | View | Thymosin Beta-4 | 5mg | 5.4mg | +8.0% | 99.80% | n/a | 12/2/25 | No Label / Silver Crimp / Clear Green Cap | Lab G | Public | |
| 4 Mar 2026 | Reta-Peptide | View | Thymosin Beta-4 | 10mg | 10.1mg | +1.0% | 99.75% | below LOQ | 8,2025 | No Label / Silver Crimp / Clear Pink Cap | Lab E | Public | |
| 4 Mar 2026 | Peptide Partners | View | Thymosin Beta-4 | 10mg | 10.7mg | +7.0% | 98.73% | below LOQ | TB202601 | White Label / Silver Crimp / Blue Cap | Lab E | Public | |
| 4 Mar 2026 | Reta-Peptide | View | Thymosin Beta-4 | 10mg | 11.2mg | +12.0% | 99.71% | n/a | 08nov, 2025 | No Label / Silver Crimp / Clear Pink Cap | Lab E | Public | |
| 2 Mar 2026 | Qing Li Peptide | View | Thymosin Beta-4 | 10mg | 10mg | 99.60% | n/a | jan 2 2026 | No Label / Black Crimp / Clear Cap | Lab E | Public | ||
| 18 Feb 2026 | Peptide Partners | View | Thymosin Beta-4 | 10mg | 10.9mg | +9.0% | 98.80% | n/a | TB202601 | White Label / Silver Crimp / Blue Cap | Lab E | Public | |
| 18 Feb 2026 | Peptide Partners | View | Thymosin Beta-4 | 10mg | 9.54mg | -4.6% | 99.90% | n/a | TB202601 | White Label / Silver Crimp / Blue Cap | Lab E | Public | |