are bigger doses needed?? more than 3 grams?? - wow - that is already lot - well in my books - but heh we are all different.
50mg/day of acetyl carnitine is plenty for me. I actually find when I take 50mg/day for too long , I get wired and ADD as I know acetyl carnitine pumps up your dopamine. i have not used both but i see no reason why you cant take both at same time.