I stopped ALL supplements because so many of them interfered with chemotherapy treatments. I take only my prescription meds. I do take magnesium. Do the research to see which ones are safe to take. I have stage 4 endometrial cancer. Had hysterectomy in August. My tumor marker, CA125, numbers are going in the wrong direction. They are in the 800's. I'm having another blood draw tomorrow, Friday. My treatments aren't working anymore. Hoping we can come up with a different one.