I used to catch a lot of colds and ever since I started taking this product I no longer catch colds and flus. The active ingredient in this product is such a powerful immune booster that scientists in a large scale clinical trial have shown that it can help elliminate the HPV virus, which is the largest sexually transmitted disease in the world and the leading cause of cervical cancer. The active ingredient is also under investigation by the National Cancer Institute as a natural therapeutic for multiple forms of cancer. I have been very impressed by the science behind this product as well as the prestigious scientists who are the co-founders of the company that manufactures the product. I would highly recommend this to anyone looking for a powerful immune booster that actually works and has scientific evidence to prove its efficacy.