i can say this, i used minoxidil when i was slightly past nw1 plus thinning on top. once i started using min it seemed as if my hair thickened right away, like with toppik or something. it was weird. im not saying its a common effect though. after a few months on it, my hair started to thin like crazy, and i ditched min. stupid move i think, because that probably was a shed, and sheddings are good. i think it depends a little bit on your age, i was young and still am, kind of. you probably need to stick with min for maybe 4-6 months. either you will see your hair improve right away, like i did, or you will experience thinning, that is even faster than when left untreated. then youre on the right track i think. so my expectations in your position would be: it should make a big difference, since youre only at nw1, so youre early in. but thats just my opinion as a former and in a few days again user.