Vitamin supplements usually won’t cause stomach problems like pain, nausea, or diarrhoea.
However, it’s important to note that supplements can have side effects sometimes, and stomach issues can be some of these.
This can happen if you’re sensitive or allergic to any of the ingredients in your supplement or simply because the supplement isn't right for you.
If you experience any side effects after taking a vitamin or supplement, you should speak to your doctor or pharmacist right away and ask for their advice.