Argentyn 23 Colloidal Silver - Bio Active Silver Hydrosol 4ozArgentyn 23 Bio Active Silver Hydrosol is composed of only 99. 999% pure silver and purified water meeting USP 23, FDA monograph for pharmaceutical grade, purified water. It is a unique mixture of the most active and effective species of silver * positively charged silver ions and particles of an unprecedented size as small as 0. 8 nm. With the smallest particles and highest charge ratio, it is the ultimate refinement of colloidal silver, offering