So at the end of this week I am going to buy some Choline Bitartrate supplement tablets for LDing.
I have fairly strict parents, especially when it comes to stuff like this. (Step mother is a pharmacist)
I have no idea how I am going to explain to them why I am taking supplement tablets such as these, like what the hell do i say to them?

I have tried explaining LDing to them before, but they just give me a blank look and change the subject.

Any ideas on how to tell them?
or should i hide them?

p.s
Is there a particular age you have to be to buy supplement tablets from Holland and Barretts? (UK users)