Last updated: May 2026
Summary: TB-500 is a synthetic peptide fragment based on the natural protein Thymosin Beta-4. PeptideDropship supplies research-grade TB-500 to verified B2B partners under strict research-use-only labeling. 99%+ purity verified by HPLC and mass spectrometry, third-party COA per batch, no MOQ, US-based Same-Day California Shipping & 2-Day US Delivery, and white-label options available. For research use only: not for human or veterinary use.
Technical specifications
| Parameter | Value |
|---|---|
| Peptide name | TB-500 (Thymosin Beta-4 Active Fragment) |
| Sequence | Ac-Leu-Lys-Lys-Thr-Glu-Thr-Gln |
| Sequence (1-letter) | Ac-LKKTETQ |
| Molecular formula | C₃₃H₅₈N₈O₁₃ |
| Molecular weight | 794.86 g/mol |
| CAS number | 77591-33-4 |
| Form | Lyophilized white powder |
| Standard pack sizes | 2 mg, 5 mg, 10 mg vials |
| Storage | −20°C lyophilized; 2–8°C after reconstitution |
Manufacturing and quality control
TB-500 is produced via solid-phase peptide synthesis (SPPS) and analyzed by an independent third-party laboratory before release. Standard QC analysis on every batch includes:
- Mass spectrometry: confirms molecular weight matches the target acetylated 7-mer fragment
- Reverse-phase HPLC: quantifies purity to the 99%+ partner-grade standard
- Counterion content: documented salt form (typically TFA)
- Water content: Karl Fischer titration
- Endotoxin testing: LAL test available on request for research applications requiring low-endotoxin product
The full Certificate of Analysis ships with every order, showing batch number, manufacture date, analytical methods, lab partner name, and acceptance criteria.
Wholesale availability
- No minimum order quantity: order a single vial at wholesale pricing
- Tiered pricing: per-unit cost decreases at higher monthly volumes; partner-specific tiers available for high-volume buyers
- Same-Day California Shipping & 2-Day US Delivery from US-based warehouse
- API integration for automated order routing
- Real-time stock visibility through the partner portal
White-label and private-label options
TB-500 is available in three fulfillment models:
- Generic: PeptideDropship-branded packaging: fastest setup
- White-label: custom labels, custom packaging, custom inserts under your brand. PeptideDropship is invisible to your end customer
- Private-label: custom pack sizes (e.g., 1 mg, 20 mg) or custom formulation. Higher minimums apply
For a side-by-side comparison of the three models, see the white-label vs. private-label guide.
Packaging and shipping
TB-500 ships as lyophilized powder in sealed amber vials with tamper-evident closure. Each shipment includes the batch-specific COA: physical copy with the order or electronic PDF delivered automatically on order confirmation (configurable per partner).
Standard packaging includes shock protection for vial transit. Cold-chain shipping is available for partners that require it. TB-500 is stable at room temperature in lyophilized form for short-duration transit; refrigeration is recommended for long-term storage and required after reconstitution.
Compliance and labeling
TB-500 is supplied to verified B2B partners exclusively for research use. Resellers and end users are required to maintain the research-use-only labeling and FDA disclaimer on all customer-facing pages, packaging, and marketing.
Resellers are responsible for compliance with their state, local, and international regulations. PeptideDropship provides the compliance documentation framework but does not provide legal advice. Partners are responsible for the appropriate handling, labeling, and onward distribution of research peptides.
FAQ
What’s the difference between TB-500 and Thymosin Beta-4?
TB-500 is a synthetic 7-amino-acid fragment of the larger natural protein Thymosin Beta-4 (TB4). The commercially available product labeled “TB-500” in research-peptide markets is the acetylated N-terminal fragment Ac-LKKTETQ, supplied as a synthetic peptide for research use.
What’s the standard purity?
99%+ purity verified by reverse-phase HPLC and confirmed by mass spectrometry. Every batch ships with the full analytical COA.
Are sample COAs available?
Yes. Verified partners can request representative COAs from recent batches before placing an order.
Is there a minimum order?
No. Single-vial wholesale orders are supported.
What pack sizes are available?
Standard pack sizes are 2 mg, 5 mg, and 10 mg vials. Custom pack sizes are available through private-label fulfillment.
How is TB-500 stored?
Lyophilized TB-500 is stored at −20°C for long-term stability. After reconstitution, store at 2–8°C and use within the documented stability window for the relevant research application.
Get started
Apply for verified partner access: verification typically takes 1–3 business days. See the peptide dropshipping guide for the business model.
Scale Your B2B Catalog with California Same-Day Fulfillment
Partner with peptide dropshipping infrastructure built for B2B research brands. Access 105+ lyophilized SKUs with 0 MOQ, batch-specific 99%+ HPLC and Mass Spectrometry COAs, and Same-Day California Shipping & 2-Day US Delivery ($15 flat-rate shipping, +$2 optional custom vial box). Explore our white-label peptides program, compare private-label peptides options, review our wholesale peptide supplier catalog, or read the complete peptide dropshipping guide.
Transparent B2B Membership Tiers: Tier 1: $397/mo (Standard Wholesale) • Tier 2: $497/mo (10% Off Wholesale) • Tier 3: $697/mo (25% Off Wholesale).
These statements have not been evaluated by the FDA. Supplied strictly for in-vitro laboratory research and analytical reference use. For research purposes only: not for human or veterinary use. PeptideDropship sells research-grade peptides exclusively to verified B2B partners under research-use-only labeling.