[bash42]

I know that PM needs time and patience, but in how many weeks could I notice the first changes?

I started on PM also. This is my personal, non-scientific, your mileage may vary, experience. :-)

I took it slow to start:

Week 1 - 500mg/day(morning)

Week 2 - 2 x 500mg/day(500mg morning / 500mg night)

Week 3 - 3 x 500mg/day(500mg morning / 1000mg night)

Week 4 - 4 x 500mg/day(1000mg morning / 1000mg night)

I didn't notice anything until the end of week 4, when I noticed increased nipple sensitivity. After 2 months of 2000mg/day I stopped for a month. When I started back up, I went straight to 2000mg/day and noticed increased nipple sensitivity after a week.