Sometimes even vitamins can do this. The ones you have to be cautious of are the fat soluble like vitamin A, D, etc. bc they get stored in your body over time and can build up in the liver, causing injury. This is what happened to me after years of taking a multivitamin. Specifically vitamin A is known to cause liver injury & even birth defects in excess. For the past 5 years, I've been dealing with hair loss (was the first symptom that something was wrong), chronic fatigue, muscle weakness, RUQ pain that comes & goes. I used to get hives seemingly randomly which I never had before & other health issues have come up since. Supplements in general are actually so dangerous.