Argentyn 23 Bio-Active Silver Hydrosol is composed of 99.999% pure silver and purified water, meeting the USP 23 and FDA monograph standards 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 your patients the most effective* and safe* dietary silver supplement available.