will only eat your hair if you are prone to it. meathead was mostly correct. my buddy swears by proviron to keep gyno at bay, and he is one horny mother fucker when he takes it. it keeps you hard, literally, keeps the water retention down, and keeps your libido going. you will get a boner when the wind blows.
primo is used as a lean mass builder, one that does not cause bloating and gyno etc.
it would only make sense to use proviron also, since the object of most primo cycles is to put on quality muscle, not water or fat. primo and proviron are both DHT derived gear, which is why they are a killer for some peoples hair. i did notice more aggravated acne with this setup.