first, dont go into gnc anymore. second, what is your diet/training like, and third what are your stats, age, ht, wt, training experience.
Chances are you shouldnt bother with either of those supps, cell mass is an overhyped overpriced creatine product.
Xtest, aside from being way over priced and from xyience, has some merit. Although it is way underdosed in this product, i've heard good things about turkesterone, just buy the bulk powder, its cheaper and you can dose higher.
I don't do this for my family, my friends, women, accolades, pride, or ego. I do it for me and no one else, its just part of who I am.