Check out the example pics Leigh posted in this thread (towards the bottom):
Low calorie diets and vigorous lifting
Sometimes further dieting wont help that much to achieve the look you're after.
Generally people will need to be fairly spot on to lose those 'last few kgs' to bring out their 6-pack. Its a real achievement for people who have never done it before. A few supplements wont make enough difference, it would take a lot of attention to detail, and at the end of the day, while a 6-pack is made in the kitchen, there still needs to be some muscle there to show off
.