Contact Us

Customer Support

For questions about product details, orders, shipping, cancellations, and returns, email service@prosynthchem.com.

Please include your order number and the email address used at checkout when asking about an existing order. Do not send your password or payment card number by email.

Warehouse and Returns Address

1477 E Cedar St
Ontario, CA 91761
United States

This address is our confirmed shipment and return receiving location. Please contact customer support before sending a return package.

Support Hours

We aim to respond within 1–2 business days. This is a service target, not a guaranteed response deadline.