I had no problems with it and actually just started it again. Of course I have never had issues with hair loss even when not on. I think if you already have problems with hair loss then it can make it worse.
It depends if you are prone to hairloss via DHT. If you are, then STAY AWAY from masteron. Don't even think about it. PERIOD. (from my own personal nightmare).
Im not pron to hair loss but i think my hair would be thiicker if i had never taken any aas. Havn't seen any significant hairloss on masteron plus im taking tren and winny so you would think my hair would be falling out like crazy, but it not and im not taking any hair growth therapy IE propecia.