I have been using Body Fortress glutamine powder as well as probiotics for 4 months now to heal my stomach. My digestive problems seem to be gone and I don't have to take any over the counter medications or prescriptions. I take one teaspoon twice a day mixed with a little bit of water. I haven't had any side effects from this powder but have heard that sometimes people should start with a small amount and see how their body reacts to it.