I have used m-stak a few times with no problem. at 20 you should have no problem with libido. also you should have plenty of free test in your system so your number one supplement should be clean food.
ok um talking about m-stak and m-stak pump :! i knw about that i read below the recommended : n my knowledge . take a pack [m-stak animal] 45 minutes prior to exercise and m-stak pump 20 min prior to exercise