Before considering a colloidal-silver listing, read authoritative safety information rather than relying on immune-related wording in a product title. The associated liquid is described as 500 PPM in a two-fluid-ounce bottle. NCCIH reports that oral silver has no known bodily benefit and can cause usually permanent skin discoloration. Bottle concentration and volume do not establish a health benefit or a safe personal dose; discuss concerns with a qualified clinician.View Colloidal Silver for Immune Support – 500 PPM (2 Fluid Ounces).Read NCCIH silver safety information.