Lily,

Anybody that gives, or distributes, acid to others must be willing to first take at least a couple of doses themselves of each particular batch. I haven't had any since the 1970's, but I'd still hold this to be true. In general, though, I'd recommend staying away from it unless you know and trust your source implicitly. Tell your friends "No", and mean it. If they insist, or give you a hard time, then they are not your friends. You have proven yourself to be a responsible person, so keep it up!