Are There Too Many Humans? Study Says Earth May Be Past Its Limit ...

Taking too many vitamins and supplements may cause health problems, including vitamin toxicity, interactions, gastrointestinal distress, and kidney damage.

Plus, which ones you should never take together.

Add Yahoo as a preferred source to see more of our stories on Google. Overwhelmed by too many toys? Why the kiddie clutter is bad for families' mental health — and what to do about it. (Photo ...