I'm glad to hear it's working so well for your daughter. I have 500mg capsules which I'll have to break open anyway. My son tends to be very sensitive so I will start at a low dose and make sure he doesn't have any adverse effects. I have read some of Dr. Hoffer's writings online, and it seems niacin/niacinamide is good for many of my son's symptoms - slight anxiety, a bit of OCD, hypersensitivity, and of course, really bad tics.
So I'm going to try it tomorrow and fingers crossed something good happens.