I been using 24 hour complex for a while now and have to say its a good product. I use it mostly before bed and sometime in the day(if I use it in the day alot, I would have ran out pretty quickly because it is a 2 pound bottle. GNC should make their casien product a bit bigger. thats the only downfall I find with this product.)I like the fact that it contain whey,soy, and casien. The whey to get your body out of the catabolic state before sleep and soy and casien to keep you in that state.