It's not clear if Holy Basil Extract will work for some people, due to scientific research on the plant being scarce. This does appear to be a quality product, though. Futurebiotics says "Our products are manufactured under even more stringent quality controls than required by federal and state agencies." The 500 mg capsules provide a good dose. Most people will want to take two a day, which is in line with the company's recommendations. It's not known if that's the best dose, as servings are based off animal research, but 1,000 to 2,200 mg a day is commonly given.