My husband and I have been taking this since I ordered it to ward off the winter time bugs we're both coming down with this year. We have both been feeling excellent since we began taking it, and recently I gave some to my father-in-law who thought he was coming down with a URI. He took 4 pills every 4 hours all day with plenty of water and was fine and healthy the following day. I am a huge believer in herbals keeping you away from the dr's office (and dreaded antibiotics!) as being the BEST medicine.