For those who seem to have trouble getting their low D3 levels back to the normal, or better yet, optimum levels take some Vitamin K supplement. You won't find it at a Walmart or usual drug stores. Drug Emporium carries it. My D3 level had gotten as low as 5. Only when I added the vitamin K did my D3 level shoot up to
90.12 in a two months time. And this is with my being
four years in remission.

I take 10,000 iu of D3 supplement due to low D3 level. I was already taking multivitamins and bone builders with over 2000 iu of D when diagnosed as low, but it must not have been enough for my body. Now with the boost of D, I have more energy and my joints don't hurt as much (on arimidex and year after chemo and radiation). I had to go online to get 10,000 D3 vitamins or you have to get by RX.

I also take P5P daily. I tablet. Its a B complex pill. It helps to prevent cancer recurrence.

I take citracal with d3 as well as 2000 iu of d3 daily. If I remember correctly, the calcium helps with d3 absorption.

I also take D3 2000 units daily as well as calcium that has vitamin D also. Almost none of us get enough vitamin D, especially if you live in northern states.