I always order the olive leaf extract here and it is supposed to be nature's antibiotic and it is helping me to get well and stay well. I actually quit smoking once I started taking this, but I can't say that this was the reason. Maybe it helped to clear out the nicotine in my system and I was able to get cleared faster. I take one a day and this product is a good strength for me. I trust Pureherbextract products and they have great prices for really good product.