Why Silver for immune support? Silver has been used for more than 2,400 years to help safeguard human health. It is a natural element that can be found in whole grains, edible and medicinal mushrooms, mammalian milk, spring water, sea water and tap water. From the time Hippocrates, Silver's health protective properties have been well-known and vastly researched. Silver was used to help protect the purity and safety of drinking water throughout ancient civilizations.