While multivitamins are generally safe, they can cause side effects in some people. Common side effects of taking multivitamins can include stomach upset, diarrhea, nausea, and vomiting. Taking excessively high doses of certain vitamins and minerals can also cause adverse side effects, especially long-term. For example, taking high doses of vitamin A can lead to … Continue reading Are There Any Side Effects of Taking Multivitamins?