Dolivaxil and Oscillococcinum are two of Europe's most popular products for prevention and treatment of influenza, and they are starting to catch on big-time in the US as well. Both are based on homeopathic principles, but are derived from very different substances and have different modes of action.
Honey contains substances that inhibit bacterial infections and when applied topically, can help speed the healing of wounds. In particular, honey produced by bees feeding on the flowers of New Zealand's Manuka trees is best at promoting wound healing.
A new nasal spray containing xylitol, a naturally occurring compound, can greatly reduce the ability of pathogenic bacteria to grow in the sinuses and throught. This can eliminate many ear and upper respiratory infections without the need for antibiotics.
Oil of oregano, a powerful natural antimicrobial, was able to eliminate human coronavirus, the virus thought to be responsible for Severe Acute Respiratory Syndrome (SARS).