I love this L-Tryptophan supplement. First of all it is one of the few in pill form, and for many of us, capsules become easily caught in our throats. Then too, since I use 1000 mg at night, I like that you do not have to take four capsules or pills to achieve that dosage. Finally, there is L-Tryptophan itself. I injured my spine 25 years ago, and, until I discovered L-Tryptophan, I had not had one decent nights sleep since then. Now, although I still have to get up in the night to shift positions, it is not every hour on the hour, as it used to be. No one can have a restful night or be alert during the day getting up every hour on the hour. Tryptophan, which I take along with Gaia's Sound Sleep, helps me to sleep up to 4 hours at a time, and unbelievable luxury for someone with chronic pain. And best of all, there are no side effects, as there were with every prescription medication I took to address the issue.