I have cml. I take 600 mg tasigna-nilotinib daily, and4000 mg vit c per day and 5000iu vit d3. Is it safe to take as much? My doc says yes.

Vitamins. Vitamins a, d, e, & k are fat soluble vitamins and so too much supplement can lead to toxic levels. Vitamin c is water soluble and so excess can be eliminated in the urine. Your likely ok taking the vit d due to your ongoing treatment. However, your physician should check your level every 6 to 12 months to insure the level is optimal and not a risk.