Silica and calcium capsules Dietary supplements Silica and calcium capsules contain the natural product silica combined with the essential mineral calcium. Silica contains the trace element silicon. Calcium is the most important mineral in the body in terms of quantity and is essential for the maintenance of our bones. The function of the muscles also depends on an adequate supply of calcium. Our bodies cannot produce calcium themselves, so we are dependent on a supply through food. The American Low Value Shipment Regulatory Modernization Act is active since March 2016 and increases the duty and tax free value of goods American citiziens could import from other countries by mail from $200 to $800 as well as no formal customs procedures are required. The American Low Value Shipment Regulatory Modernization Act is active since March 2016 and increases the duty and tax free value of goods American citiziens could import from other countries by mail from $200 to $800 as well as no formal customs procedures are required