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Can I take too many vitamins?

my health adviser told me to take certain doses of vitamins to combat a skin condition that includes getting boils, some of which far exceed the dosage on the bottle. are there any adverse effects to taking too many vitamins? ive heard that if theyre water soluble ill just pass the extra in my urine, is that true? if so, am i wasting money by taking too much? i am a 25yo white male.
The short answer to your questions is yes, you can take too many vitamins. What you have heard is true, that if you take water soluble vitamins they will pass through your urine and you will rarely have any issues overdosing on them. The vitamins that can cause issues are the fat soluble vitamins - vitamins A,D,E, and K. These are not passed in the urine, and can build up in your body to dangerous levels - but you usually have to take A LOT of them before this happens. For vitamin A, you need to be taking more than 33,000 IU a day before you will get any adverse side-effects. In terms of vitamin D, you run into problems when you are taking more than 60,000 IU. The recommended max amount of vitamin D to take per day is 4000 IU. Vitamin E's upper limit is 1100 IU. Vitamin K overdose is hard to come by, and there is actually no documented upper limit as it is extremely rare. So yes, you can overdose on vitamins. however, you have to take a lot of them before you'll develop any adverse reactions. In terms of the vitamins that your health adviser prescribed, if your health adviser is a licensed medical professional I would go with their opinion. The best thing to do though, is to go see your family physician or a dermatologist regarding your "skin disorder". They can fully assess your problem, and decided on the proper treatment [whether it be vitamins or other medications] that you'll need.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under ZocDoc’s Terms of Service.

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