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Here are additional reasons to chat with your doctor before you start taking supplements. Your doctor may recommend a blood test Self-diagnosing isn’t necessarily the best strategy.
May slow clotting; contraindicated for people with bleeding disorders and before and after surgery. May induce uterine contractions; contraindicated when pregnant or nursing. [21] Pyrrolizidine alkaloids (contained in comfrey, borage, senecio, coltsfoot, and others) Liver damage [5] Reserpine: Rauvolfia serpentina
Premedication before chemotherapy for cancer often consists of drug regimens (usually 2 or more drugs, e.g. dexamethasone, diphenhydramine and omeprazole) given to a patient minutes to hours before the chemotherapy to avert side effects or hypersensitivity reactions (i.e. allergic reactions). [citation needed]
In some cases, vitamin supplements may have unwanted effects, especially if taken before surgery, with other dietary supplements or medicines, or if the person taking them has certain health conditions. [73] They may also contain levels of vitamins many times higher, and in different forms, than one may ingest through food.
“The best time to take vitamins depends on the vitamin you are taking,” explains Jim White, R.D.N., A.C.S.M. Ex-P, owner of Jim White Fitness and Nutrition Studios.
Preformed vitamin A is fat-soluble and high levels have been reported to affect the metabolism of the other fat-soluble vitamins D, [24] E, and K. The toxic effects of preformed vitamin A might be related to altered vitamin D metabolism, concurrent ingestion of substantial amounts of vitamin D, or binding of vitamin A to receptor heterodimers ...
Vitamins are useful in preventing and treating illnesses specifically associated with dietary vitamin shortfalls, but the conclusions of medical research are that the broad claims of disease treatment by advocates of megavitamin therapy are unsubstantiated by the available evidence.
Beneficial side effects are less common; some examples, in many cases of side-effects that ultimately gained regulatory approval as intended effects, are: Bevacizumab ( Avastin ), used to slow the growth of blood vessels, has been used against dry age-related macular degeneration , as well as macular edema from diseases such as diabetic ...