Contact QST
Get in touch with our team for orders, inquiries, and support
QST Sales Team
Alisa Yang
Sales ManagerAlisa oversees all business operations including custom synthesis, OEM partnerships, bulk pricing, and wholesale enquiries.
Michelle
Fastest ResponseSales Representative
Michelle handles all orders, product questions, shipping updates, and after-sale support via WhatsApp.
Security Notice: Michelle and Alisa are the only official QST representatives. Always verify you are speaking to us on WhatsApp at +1 (341) 345-8639.
Buyer Protection
100% Delivery Guarantee
Package seized or lost? We reship at no cost — no questions asked.
60-Day Refund Policy
Full refund, free replacement, or 110% store credit within 60 days.
Secure Payments
256-bit encrypted. Visa, MC, Apple Pay, Google Pay, Bank Transfer, Crypto.
Discreet Packaging
Plain, unmarked — no labels or branding visible.
Shipping Information
Qingdao, China
7-15 business days worldwide
$25 worldwide with tracking
$50 — fully tracked via USPS, Royal Mail, DHL, etc.
Our Services
OEM Service
Custom manufacturing for bulk orders
Janoshik Testing
Third-party analytical verification
Bulk Discounts
Volume pricing for institutions
Custom Synthesis
Bespoke compound formulation