I think you are still too young personally, I didn't run anything until I was 27, but if you decide to do it DMZ is not the strongest but closer to that than the weakest. I think something like Pmag, Hdrol, or possibly Epistane would be a better choice for a first PH cycle. You should also run a test base if you do anything. 11oxo if you can find it is also an extremely mild PH with no sides but it needs to be ran at a high dose to have a PH like effect. Just some ideas for you but I would still hold off awhile, get some natty test boosters or do something to increase your natural production unless you have diagnosed symptoms of Low test levels. My test levels were in the high 900s until I was 26, where they dipped to the low 900s lol.