I started taking this product a little over a month ago while recovering from rebound migraines from Relpax (one of the triptans). I'm a chronic "classic" migraine sufferer - approximately 12 attacks/month. I am on norvasc (calcium channel blocker) 2x/daily 5mg which helps but 3 months ago I had a migraine that didn't end for 3 months. For those of you who are familiar, this is called "status migrainous". I had to be on a course of steroids to break the migraine cycle. During this attack, I purchased this butterbur with feverfew. I also purchased another feverfew product, Nature's Way Feverfew Leaves - each feverfew capsule contains 380 mg feverfew. I took NOW butterbur with feverfew 3x/daily with meals along with the additional capsules of feverfew - 2x/daily (just for extra help). I also started taking 1,000mg magnesium oxide at bedtime. Within 3 weeks I noticed a dramatic difference (which I honestly wasn't expecting but I was desperate for help). Several times within the past couple weeks I either woke up with a migraine slightly starting or one starting during the day, but then when I got up and took the supplements, within a half hour the pain just ended up going away. No triptans required! The reason I was so skeptical is because I have tried every medicine out there and nothing has really helped me until I found Norvasc, but even that isn't so great. If you suffer migraines, this is worth a try. Give it time and also, take it the full 3x/daily at least for 6 weeks to see if you notice a difference. I'm not sure if it was this product alone that helped me or the combination of this with the additional feverfew with the magnesium, but I haven't had a migraine in 12 days and I feel great and don't plan to stop any of these.