Eli5: Why does taking Multivitamins on an empty stomach cause nausea?

Question

I know that it’s recommended to take vitamins with food, but why does taking a vitamin first thing in the morning without food cause stomach cramps or nausea?

In: 0

Answer 1

High Iron concentrations tend to lead to nausea. Most MV have Iron.

Have you tried a chewable w/o Iron? They typically do not have this effect.