Silver
Silver is an anti-bacterial metal. It is used for this reason in the water treatment filters you can buy for your kitchen counter. If you will wear silver jewelry on your body, it will help you to avoid bacterial infections, including pinkeye. Wear a sterling silver ring, necklace, earrings, or bracelet. Babies are often given a silver necklace chain to wear. Knowledgeable parents use silver spoons and cups for babies. They also give their babies plenty of water.
I have designed a silver chain ring that is very comfortable to wear. I gave my jeweler a section of a curb chain and he welded it into a small circle. The ring is easily sized by tapping on the links with a spoon.