Well I was on 40,000 iu a week for 12 weeks - one tablet twice a week but I still don't feel any different to be honest. Was expecting some miraculous recovery but it didn't happen but my levels were very, very low apparently. My GP, who has now left unfortunately, said I would need the levels checking again after the treatment and then a long term supplement but the new GP said I didn't need it checking and just take a supplement if I felt I wanted to! I actually bought K2 tablets but didn't take them....as I felt like I was taking enough with other stuff I take which was silly really.