So either you've heard about, or have used the C4 Ultimate, and you need it!
The C4 Ultimate, SuperHD Ultimate and NO3 Ultimate are exclusively sold at GNC locations across the country. The only member of the family that is not exclusive to GNC is the C4 Ultimate On The Go.
Sidenote: You can always purchase these products from Cellucor.com as well!
Unsure of where the nearest GNC is? Be sure to follow the link below to find your local GNC store to buy the Ultimate line of products.