About this item STRONG IMMUNE SUPPORT: Natural Path Silver Wings Colloidal Silver 500PPM is our best seller. 50 times stronger (more silver particles) per serving than 10PPM silver solutions. Higher PPM strength offers convenience of less dosages per day. Properly prepared pharmaceutical grade colloidal silver is safe to use in higher PPM strengths and concentrations. SMALL SILVER PARTICLES ARE MORE BIOAVAILABLE. Natural Path / Silver Wings Colloidal Silver average silver particles range from 0.6nm ֠3nm. It is easily absorbed and readily available for your bodyҳ immune support needs. Silver Wings Colloidal Silver is safe, more bioavailable and effective for immune support than competing brands. WHAT IS PARTS PER MILLION (PPM)? PPM (STRENGTH) is the number of silver particles per serving yields greater concentration and increased immune support. Silver Wings offers products in 50,150,250, and 500PPM. IS COLLOIDAL SILVER SAFE? Yes. Due to the unparalleled silver particle size, Silver Wings Colloidal Silver is safe for the whole family. Properly prepared pharmaceutical grade colloidal silver is safe to use in higher PPM strengths and concentrations. Natural Path / Silver Wings is the oldest (since 1994) colloidal silver manufacturer in the United States. AMBER COLOR IS KEY: Silver Wings is made from naturally occurring elemental Silver, which has a color. It is not ionic or electrically processed. The higher PPM, the darker the amber color colloidal silver suspension (liquid) will appear. GMP CERTIFIED & QUALIFIED 3RD PARTY INDEPENDENT LABORATORY VERIFICATION- Natural Path / Silver Wings manufacturing and distribution facility is UL cGMP certified and FDA inspected. Silver Wings verifies PPM, silver particle size, stability, pH, etc. at Qualified Independent Third Party Laboratories. Both UL and FDA review the in house testing and independent laboratory verification. During the summer months products may arrive warm but Amazon stores and ships products in accordance with manufacturers' recommendations, when provided.