Supplemental zinc can inhibit the absorption and availability of copper. If more than 50 mg of supplemental zinc is taken daily, 2 mg of supplemental copper should also be taken to prevent deficiency. Chronic ingestion of more than 100 mg of zinc daily may be immunosuppressive. We ship most of the orders within the Handling Time specified. However, please make a note that we do not ship on Saturdays and Sundays. We will always keep your informed if we anticipate any kind of delay in your order. VitaGen is NOT responsible for any and all packages detained/impounded/or returned to us by the country’s respective Customs Department. It is the FULL responsibility of the customer to ensure that these vitamins and supplements are allowed by their Customs. Customs regulations vary grea.