About this item DOCTOR DEVELOPED: Also recommended and used by Doctors. STRONG & MOST EFFECTIVE IMMUNE SUPPORT: 25x stronger than other brands with only 10 PPM. BETTER VALUE: Higher Strength = Fewer Doses = More Economical. SAFE & SUPERIOR ABSORPTION: Unparalleled small silver particle size. Made from naturally occurring elemental silver which has a true amber color. Itҳ non-GMO, gluten-free, allergen-free earning the 2020 ParentsҠPicks award for Best Family Health & Safety Product and the Momҳ Choice Award for Best in Family-Friendly Products. HIGHEST QUALITY / ULTRA PURITY: Pharmaceutical grade deionized pure water with ultra-fine (only 1-3 nanometers) pharmaceutical grade colloidal silver particles in amber glass bottles for optimal quality, integrity and protection. Never plastic! INDEPENDENT LAB TESTED & VERIFIED: UL cGMP certified and FDA inspected. Qualified third-party laboratories verify PPM, silver particle size, stability, pH, etc. VALIDATED: Backed by clinical, laboratory, university research and in-vitro studies. Voted Best Immunity from the 2020 Best of Supplements awards.