I read the primal blueprint and it seems like 75%% good science and 25% woo, give or take 25%. Some things do make sense such as the meal time not being an evolutionary principle but merely a societal one.
However, the whole question of vitamin supplementation is unclear to me. I know some recent research said that vitamin supplementation did not aid life expectancy? or something (I don't have the study(ies) at hand), but I seem to recall the research being suspect.
I mean if you are overweight, never exercise, and eat tons of sugar and refined carbs AND take vitamins...well...is it the vitamins that are hurting you?