Taking large quantities of minerals and vitamins may affect the absorption of others. And no optimal ratios have been determined so far.
So it's not just that taking lots of one thing is not good for you, it's that it may cause a dangerous reduction in something else even if you are also supplementing that.
MORE IDEAS FROM THE ARTICLE
Looking at individual studies won't determine if vitamin supplementation is good for you. They're scientifically dense and the conflicts of interest can be very hard to spot.
"Systematic review papers" are much better suited for that. This is where independent scientists gather up all the available data and re-analyze it to answer big questions.
Administration of antioxidants is only justified when it is evident that there is a real deficiency of a specific antioxidant.
It is far better to get antioxidants from food because it contains a mixture of antioxidants that work together. A diet rich in fruits and vegetables provides a healthy balance of pro-oxidants and other compounds whose roles aren't fully understood.
While over-the-counter medicines provide us with a so-called ‘relief’ by suppressing our fever, runny nose and other ‘symptoms’, these are in fact necessary for the body to get well. The symptoms we want to be stopped are not our enemy: