About three years ago, after sinus surgery and many years of constant sinus bacterial problems, being on antibiotics for years, my general health and my immune system was very depleted. As a pharmacist, I know that when a body's immune system is not working well, things really break apart. I consulted with an immunologist and he recommended for me to investigate the positive benefits of lactoferrin. The more I read, the more I became convinced that lactoferrin offered me something that other approaches had not helped me. I also researched companies that sell the product. Being familiar with LifeExtension.com I compared their price and quality to other companies, and by far LifeExtensions surpassed all other companies. I and my wife have taken lactoferrin daily, 3-4 capsules, for over 2 years. I can say my immune system is working great. I have had no sinus problems, no colds, no flu and no illnesses since starting this product and taking it on a regular basis every day. Lactoferrin is truly an immune system energizer bunny