^ That's why i brew my own gear. I can choose the amount of BA and BB i use to keep pain to a minimum/non-existent. And I know my stuff was made sterile and accurately dosed. Too hit or miss with most UGL's.
As for your 18 year old 'friend'... if he IS deadset on doing anything... 8 weeks of prop sounds like the smartest plan of attack. I'd still try to get him to wait until he's 21 or so, but if that isn't an option 8 weeks of prop and good post cycle therapy (pct) should at least minimize any potential issues. prop, tren, and anadrol as a first cycle is IDIOTIC. Regardless of age. Tren shouldn't be run until quite a few cycles in honestly, and it shuts you down HARD, another prime reason he should steer clear. The results might be great... but the negative effects go up big time as well. And at the age of 18 he might not be mature enough to handle the sides and potential added aggression that can come with tren.
So, basically... if he's deadset on it... 8 weeks prop at 400-500mg EW and a proper post cycle therapy (pct) and that is his safest bet. But, i'd highly suggest he keeps training hard naturally and holds off another few years.