If it's any help, I started at 7.5% and got decent results. The 7.5 is just a compromise number between all the 5% users who claimed it wasn't working and the few 10% users who said they got finasteride-like side effects.
About a month ago I started applying RU 2x/day and after a couple of weeks noticed faster growth. The topical regimen was this about 12h apart:
minoxidil foam 5%, wait for it to dry
RU 7.5% in K&B solution, wait at least an hour before showering
From what we know about RU's short half-life it makes sense that the 2x/day would work better. It's a PITA though and IMO only makes sense for regrowth. Once the new growth seems to slow down, might as well drop to just the night dose for maintenance.
You gotta be careful with the morning dose though, it could be dangerous to spread anti-androgens to other people, especially pregnant women. Best to wait the hour, then shower before going anywhere. sh*t, be careful with the night dose too... wash your pillowcase and sheets regularly. This makes sense for the minoxidil too, you don't want that stuff getting all over your face causing wrinkles.
