Typically those (IIRC) are basically just sugar. I am pretty sure the coopers/mr.beer kits come with boost sugar.
Correct me if I'm wrong.
Two Raven Brewery
[Is finally brewing again!]
Primary1: Envy - Green Tea Wheat (4/11/09)
Secondary: Schwarzbier Kit (1/11/09)
Bottle Conditioning: None ATM
Drinking: None ATM
Up Next: Lemon Honey Pilsner (est. unknown)