Shipping policy

Updated: November 10, 2026 

International Shipping (outside the USA): 

Where we ship. Product availability is determined by your shipping destination. Where a product may be subject to regulatory restrictions in a destination country, it is not available for purchase from that country. We review these restrictions regularly and update availability as requirements change. Kits, including any prescription medications, are available only to customers located in the United States.

The recipient is the importer of record and must comply with all laws and regulations of the destination country. The recipient of an international shipment may be subject to import taxes, customs duties and fees, which are imposed once a shipment reaches the recipient's country. Additional charges for customs clearance must be fulfilled by the recipient. Zelenko Labs has no control over these charges, nor can Zelenko Labs predict what they may be. International orders are subject to the same return terms as domestic orders. Customers in the EU and UK have a statutory 14-day right of withdrawal for unopened products; see our Refund Policy.

Customs, duties, and taxes are non-refundable:

In the event a shipment is refused because of unexpected import fees, the cost of the original shipping and any return shipping charges will not be refunded.  

Customs policies vary widely from country to country; you should contact your local customs office for more information. When customs clearance procedures are required, it can cause delays beyond our original delivery estimates. 

To avoid a delay in receiving your order from customs, we strongly suggest: 
  • Providing a phone number where you can be reached by customs when your product arrives. This phone number will be listed on the commercial invoice so customs can reach you to clear your order. 
  • Do not refuse a shipment or ignore requests from carriers regarding duty and/or tax liability charges.
  • Be aware that most carriers will hold a shipment for 5 days after arrival in your country before they return it to the sender. 
All sales are final.

We do not refund original shipping charges for goods that are refused for delivery at customs or because of a bad delivery address. We also charge a 15% restocking fee for any orders that are returned to the warehouse.  

Domestic Shipping Issues (within the USA):

We are not responsible for issues related to inaccurate shipping addresses. If a shipment is returned as undeliverable, a refund will not be issued.


If you have any questions regarding your international order, please contact us at support@zstacklife.com. 

Changes to this policy:

We may update this policy from time to time by posting the revised version here with a new date.