Argentyn 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.