nature's sunshine silver shield liquid 16 fl oz nature's sunshine silver shield, a colloidal silver product, provides the benefits of colloidal silver with immune support and protection. how it works: silver shield with aqua sol technology features pure silver particles suspended in pure water for powerful immune-system support. it is manufactured using a patented process with strict quality control to verify potency and purity. the result is fine nano silver particles with 99% bioavailability.