Zinc is well known for its reported ability to reduce the length and severity of colds. It can reduce the severity of canker sores, sore throats, and skin injuries. It also relieves acne, also known as zits, tinnitus, which causes ringing in the ears, and eye problems. It is also believed to be effective in fighting auto-immune diseases, and inflammatory diseases, such as rheumatoid arthritis, lupus, and fibromyalgia.