Hi - I've been taking LDN since summer of 2005. I started at 3 mg, went to 4.5, then back to 3. The reason why I reduced the dose was a recommendation from the main website that persons experiencing spasticity due to MS should stay at 3 mg. I believe it makes a difference.
I've experienced some increased disability since 2005 and started Copaxone, but I still take LDN for its benefits on fatigue, bowel and bladder control, and mood. It also seems to boost my metabolism.
Skip's uses Avicel for filler. Here's a good explanation of fillers:
http://www.gazorpa.com/LDNFillers.html
If you battle Candida on a regular basis, you might request Acidophilus as your filler. I always prefer that my pills multi-task.
