Drink Green and/or White Tea everyday. I get Green/White Fusion from Stash.com. Haven't been sick for 10 years since I started drinking it daily.
Also, don't drink cow's milk. Do you know how much puss is in each glass? 8th Continent Soy Milk is better for you and the chocolate version tastes just like chocolate milk
The vegi-supplement pills and fish oil are good too