This formula has all of the best ingredients for keeping you sick free. The vitamin c levels in this formula are high to ensure optimal safeguards against the cold or flu. In addition, the mushrooms and other ingredients provide the immune system protection against exposure to people who are sick or for weather conditions that can make you sick. I have been around family and work associates who have been contagious, and I take the pills and remained well. If I do have symptoms of a cold, which is rare, I take a couple extra pills and I begin to feel better the next day or sooner. I stockpile my cabinet with this amazing product, so that I do not run out. I have also incorporated this product into my 14 year-old daughter's regime because she plays high-level volleyball 5-6 times a week. This much activity can really take a toll on a young body and she was getting sick almost every week. Since I have given her this Source Naturals Wellness Formula, she has not gotten sick! The product is very easy to swallow, and all of the important immune building ingredients are in one pill. This makes taking vitamins a snap!.