I SWEAR by colloidal silver, preferably 10-30ppm. Think silt c. corn flakes. Silt gets into nooks & crannies best! DOn'T be dazzled by 500ppm. I bought a home brewer which I use with distilled water. I drink it straight up, alllll the time. I apply CS to any and every imaginable cut, burn, rash, sore. It's simply teeny particles of silver suspended in water. NO single cell organism can live with silver!!! Not fungus/bacteria or virus-- even the current virus making everyone nutty RN. NO, you won't turn blue unless you drink 10 gallons a day. The smurf guy was TRYinG to look like that! I bought mine thru THE NATURAL HEALTH LIBRARY on fb. Terry is the best!