Vitamins are essential for our health and wellbeing, but taking too many can have adverse effects. Routinely consuming an overload of vitamins and minerals can cause nausea, diarrhea, stomach cramps, hair loss, fatigue, and mild nerve damage. Taking vitamins on an empty stomach can also make you feel sick. To avoid stomach pain, take them with food, use easy-to-digest formats, and reduce the dose size.
Certain vitamins are more likely to cause irritation in the stomach, such as Vitamin C, E, and iron. Taking too many fat-soluble vitamins can also lead to chronic nausea. Exercise can induce acid reflux, so if you take vitamin C on an empty stomach you are more likely to feel sick. High amounts of vitamin D can cause side effects such as diarrhea, vomiting, tiredness, itchy skin, and bone pain.
Unless you have a deficiency, there is little evidence that taking extra vitamins has any additional health benefits. Learn more about the different vitamin supplements and when it's best to take them to ensure your health and wellbeing.