Received this from a doctor for food poisoning in samples. This nuked the food poisoning in just a few hours. Worked well. A couple months later, I got food poisoning again. Decided to invest in this for protection. Got my system going again. Once you are healed and use it as a vitamin, you won't really feel a difference as if you didn't take it. It's all on you to keep a good system going. All in all, this product works quite well.