Thank you for your interest in Pon de Silica. Samples are usually offered at half the retail price. Please give it a try. [Pon de Silica] Silica is contained in about 18 g in the human body and is distributed in the skin, blood vessels, hair, cell walls, etc. It is a mineral that plays an important role in maintaining the health of bones, skin, hair, blood vessels, etc. You can easily make silica water from tap water, so you can ingest silica efficiently. Each cartridge can be used for about 2 months. (*In the case of 1.5L/day)