My docs having me taking calcium citrate, I use Cetracal by Bayer; 2 pills in the morning (400mg total) and 2 pills in the evening. Total 800 mg per day. I also take 2000 iu of D3, three time per day for better absorption and with food. Last blood work showed my D3 levels were slightly in the normal range, but my doc suggested to increase to around 6000 iu per day. I have actually felt much better after I increased this dose. I have been on ADT for almost 10 years now, and it is important for bone health, to monitor these levels.