The first thing to note about GNC in the Cerritos Mall is that you won't know that it exists unless you go to Sears (because Sears is located at the very end of the mall). They don't have a big size for a store, but I guess they don't need one because they are a few different kinds of products. GNC provides healthy goods, such as Vitamins, Sport Nutrition goods, diet and energy products, and more. I guess they are really known most for the all the different kinds of vitamins they sell. Prices for vitamins usually range from 17 to 20 bucks, it depends on the size and kind you buy, so it can vary. Personally, at least for me, the Vitamin World in the mall is better located and has a better variety of vitamins and health supplements. I'd recommend going to Vitamin World first, then to GNC if Vitamin World doesn't have what you are looking for.