The most powerful colloidal silver on the market consists only of silver particles and water. No additives! Our silver water contains the smallest particles measured by any colloidal silver manufacturer. Our 10 PPM is the optimum concentration: after thousands of hours and research over a period of 20 years, we guarantee our product will work for you and your loved ones needs. This all-natural, antibacterial, mineral solution is the only one of its kind to be designated as a Class 1 medical device. Packaged in pharmaceutical-grade glass. Unlike ionic products, Crystal Colloidals Silver is very stable, not light sensitive, and does not need to be refrigerated after opening. Do not freeze, the colloid will break! Available in 100ml, 250ml, and 1000ml. When the smallest dosage (5ml/day) is taken, the 1000ml bottle will last 200 days and 12 days when the highest dosage (80ml. day) is taken. The actual dosage depends on the individual need.