I just checked all my bottles, prime, ap, pf all say"
Warnings: This product is intended for healthy adults 18 years of age and older. Do not use if you have an existing medical condition without the consent of your doctor. Stop taking and consult your physician if you experience any negative side effect. Keep out of reach of children"
Im guessin this is mostly for legal reasons, but I can NOT speak for usp, and Im just takin a guess to try to help. I cant see how someone who is 17 years & 325days old is any different than someone who is 17 years and 364 days old about to turn 18, vs someone who is 18 years old.
Again, I DONT speak for usp, but Im pretty sure they will have to tell you to wait till your 18 and legal, but if you can find borobulker somewhere on here, Im sure he could set you up with a good diet to get you started until you hit the magic 18.