Highly concentrated silver is a gimmick. I will bet you a hundred dollars to a penny that what he bought was NOT true Colloidal Silver - unless it was Utopia-Silver 's Advanced Colloidal Silver or Purest Colloids Mesosilver. And btw, in just about every instande healthfood stores carry what is best marketed to them and what they can make the most money from, not the best Colloidal Silver .