That's interesting. I've actually found that it, coupled with other nootropics, reduces my anxiety by quite a lot. I've been taking it for a couple months and haven't had any negative side effects. I used to get "racing heart", palpitations, HBP, and other symptoms when I'm stressed (which now I'm attributing to the general bucket of "anxiety"), and these supplements really help calm my nerves throughout the day and I haven't had many symptoms since.

For me it was palpitations from 5-HTP. Heart skips a beat, then sudden extreme vertigo and anxiety skyrockets. This happened several times a day.

And magnesium caused a dull, ever-present pressure/ache in the left side of my chest that went mostly away (except when I'm very anxious) after I stopped taking it.