1mg per day is the prescribed dose for Propecia (Finasteride) for male pattern baldness. Some studies I have read have proven 1/2mg per day to be almost the same effectiveness. ***NOTE:This stuff isn't side effect free for everyone, I had damn near all of them when I tried it. Not from AG-Guys though, I used tablets from local pharmacy.
I believe AG-Guys has a 5mg/ml solution, if you want 1 mg, then that would be 1/5mL or .2mL. Then if you want .5mg, that would be .1mL. Hopefully if your using it you can do the math. Use a slin pin for more accurate dosing.