Hey! I'm ready to order large quantities of this stuff, anybody else?

The only thing is, I don't know how much to take. I don't want to take too much and distroy my liver, but I don't want to take so little that it doesn't do much good.
Anybody taking this form of B3 (Nicotinamide), and if so how much? I hate to jump the gun, but it is an available supplement, so I might as well try it, 'cause I'm getting old waiting for a cure.
Wadda ya think?