TB500 (CAS 77591-33-4): Import & Customs Guide for International Buyers

Executive Summary

This independent buyer guide covers TB500 (CAS reference: 77591-33-4, approx. MW 4963.5 Da, category: Healing) for international laboratories sourcing research-grade material from Chinese manufacturers. Peptide From China publishes these guides to help buyers prepare customs documentation—not to sell product directly.

CAS and Product Identification on Invoices

Including CAS 77591-33-4 on commercial invoices and COAs helps customs brokers and couriers classify TB500 consistently. If your supplier lists a research peptide without CAS, request sequence confirmation and MS identity data.

Browse catalog listing: /products/tb500-5mg

Typical Research Specifications

• - Product: TB500 lyophilized research peptide
• - CAS reference: 77591-33-4
• - Molecular weight (approx.): 4963.5 Da
• - Intended use: Research Use Only (RUO) — in vitro / laboratory R&D
• - Not for human consumption, therapeutic, or cosmetic drug claims on import docs

Documentation Package for Customs

• - Commercial invoice with CAS (when applicable) and RUO statement
• - Packing list with vial quantities and batch/lot numbers
• - Batch COA: HPLC purity + MS identity matching expected MW
• - MSDS if requested by broker
• - Importer details matching your legal entity or customs agent

Shipping Considerations for TB500

Lyophilized TB500 typically ships via DHL, FedEx, or UPS. Confirm with your supplier whether ambient express is acceptable or if cold packs are recommended for your climate lane.

DDP vs Buyer-Cleared Import

• DDP — Supplier/freight partner pays duties to your door; confirm fee breakdown.
• DDU — You clear customs; more control, requires broker relationship.
• - Align payment terms with documented export readiness.

Quality Verification on Arrival

• - Match vial batch numbers to COA
• - Verify MW on MS report against theoretical ${p.mw}
• - Store per supplier guidance (often -20°C lyophilized)
• - Retain sample for dispute resolution

Regulatory Notice

Import rules for research peptides vary by country and change over time. Consult qualified customs and legal advisors. PeptideFromChina.com is an informational directory; products are for laboratory R&D only.

Get Supplier Introductions

Submit a procurement inquiry naming TB500 and CAS 77591-33-4 for manufacturer matching through Peptide From China.