18 and up for no2?

i was just on gnc's website and i noticed when i clicked on no2 that it said "must be 18 or older to purchase".  I was just wondering if this product isn't safe for teens or what because all the other n.o. products don't require an age to buy it. 

Age: 15

Hieght: 5'9''

Wieght: 155

Max Bench: 205

stack: No Xplode, cellmass, 100% whey protein

Hi,
If you look at any Mass gainer, or Muscle supplement or anything it will say something along those lines, Yes it's safe to take a creatine, or a No2 supplement, BUT, first I'd actually go Nd see a doctor regarding these, since i've had friends with heart problems where these supplements just wont make it get better, could be harmful..But yeah, Im 16, and I go into the Vitamin Shoppe and buy stuff all the time, and I havent had one problem... and also, after looking at the signature you have on here, No-Xplode, and Cellmass it will say " Not Intended for people under the age of 18" or something like that.

yeah i also go into to the stores and buy supplements with no problem and im 15, but this no2 product doesn't recomending being under the age of 18... its straight up saying Individuals under 18 years of age are restricted from purchasing this product. (exact words)

so i was just wondering the reason why they are not letting people under 18 buy it

Age: 15

Hieght: 5'9''

Wieght: 155

Max Bench: 205

stack: No Xplode, cellmass, 100% whey protein

yeah,
just a different way of saying whats on all creatine/muscle building products, I believe you'd be fine, but like I said, if you need to, see a doctor.

. Here you go

...?

Age: 15

Hieght: 5'9''

Wieght: 155

Max Bench: 205

stack: No Xplode, cellmass, 100% whey protein

just ask the parentals, then see what they say, then depending on their answer, go for it.