Here is part of a post I made in 2008 on another board here and it holds true to today about prescriptions, supplements and OTC (over the counter meds). 10/31/08 I don't know if anyone saw The Doctors on TV the other day, but they talked about supplements and the importance of alerting your doctors to them. They told of a woman who was taking medication to stop seizures who took Ginko Bilboa (spelling?). The Ginko reduced the ability of the prescription seizure medication to act and the woman died from a seizure because of the Ginko. They even warned about checking all the OTCs you take so you are not getting too much acteophenomen--as you can get it in many different OTCs. Who would ever think about the seizure death would happen or aceteophenomen (like in Tylenol) can be bad in too large a quantity. And we have to remember that people in health food stores are not doctors or licensed professionals, they're sales people. Discussing herbals, supplements and vitamins plus your prescriptions is best with a doctor, a licensed nutritionist or a licensed natureurist (I think that's what they are called) as they can really help save your health, potentially save your life, and put you on a better health tract and that's what we all want. They have good uses, but get professionals to guide you in use of them. My doctor yesterday put me on Vitamin D and Vitamin C [sic. should be calcium not Vitamin C] together--BUT told me that the Vitamin D WILL CAUSE CONSTIPATION but because he's treating me for terrible diahrea (that initially is suspected as potentially IBS but I never get constipation from it), he has no problem with me taking Vitamin D and Vitamin C. BUT DOESN'T WANT ME TO INCREASE the doseage he prescribed because increased doses of Vitamin D can cause problems when you have immune disorders like lupus (I have lupus) and they can impact your kidneys and immune disorder when they worsen and impact internal organs like the kidneys (even the Mayo Clinic warns against it with Vitamin D). Wow, I am so glad the doctor and I discussed it and he told me exactly how much I am to take each day.