A neighbor recommended these (olive leaf extract) for a boost in imune system when the whole family was coming down with an illness right before Christmas. She gave us her bottle and we ordered her a new one, off of this site where she gets hers, to replace it. We took them every four hours during the day (basically 3 times a day) for three days and were back to good health before Christmas Day and were even feeling much better during the three days that we were taking them. We then followed up with once a day usage. Being able to order them and receive them within a few days to replace hers was very convenient and I will be using this site to order more for myself.