The reality of it is, that it is there house, and they have the right to say what stays and what goes!! However, everyone is approaching this situation as if they never broke a rule or hid something from their parents!!! Get real..... I am willing to bet that at one point or other we have all hid something from someone who cared or had authority over us!!!! Nonetheless, it is true that at 22yrs. old you should reconsider usage, but thats your personal issue so I wont get into changing your mind on something you already have you mind set on. You question here was: HOW TO HIDE IT FROM THEM, so to that I will respond: I am a grown ass man, and married yet to this day my family wonders how I stay so big, but they also know I walk around with tupperware & and a big ass lunch bag w my meals, proteins & supps....my father (who does not know I juice) is always the first one to tell them it's b/c of the way I eat, and train. My point is...if they see a significant dedication to the way you eat, train and take supps, then they have no reason not believe you when you tell them its all natural. Look at how many people you see in the gym off diet, drinking, smoking, doing everything wrong, yet they workout religiously believeing the will eventually get swole as hell. Like someone said earlier....try to keep it a friend/g-friends house and stick w/ the diet/training dedication explanation.