Don't take a "multi" vitaman, take a MEGA vitamin. Atkins gives specific minimums in his book... Remember that the "minimum daily requirements" were based on a Govt study years ago on what soldiers needed daily to "survive" not what was optimal.

...and you probably won't find much potassium in a vitamin. You may be interested in a similar thread I posted which got a fair amount of response.

http://forum.lowcarber.org/showthread.php?t=182295

GOOD LUCK!!