Why You Might Feel Sick After Taking Vitamins

Taking a daily multivitamin or supplement can boost your health, but if you’ve ever felt sick after swallowing one, you’re not alone. This unpleasant experience might even make you consider stopping your vitamin routine altogether.

Dr. David Poppers, a gastroenterologist at New York University’s Langone Medical Center, explains that certain vitamins can cause stomach problems. These issues can include abdominal pain, nausea, or diarrhea.

Here are some reasons why your vitamins might be making you feel unwell:

Taking Vitamins on an Empty Stomach

Vitamins that are acidic, like vitamin C or folate, can cause nausea if taken without food, according to Dr. Poppers. Eating a snack or a small meal with your vitamins can help buffer these effects and improve nutrient absorption. However, some vitamins, like fat-soluble ones (A, D, E, and K), might be better absorbed without food.

High Iron Content

Multivitamins with a lot of iron, such as prenatal vitamins, can cause nausea, especially if taken on an empty stomach, says Dr. Donald Hensrud from the Mayo Clinic Healthy Living Program. Although iron is best absorbed on an empty stomach, it can be tough to tolerate. Dr. Hensrud suggests taking iron with food to avoid nausea, even if it means slightly less absorption.

Mixing Vitamins with Other Medications

Dr. Hensrud points out that vitamins can interact with each other and with other medications. It’s crucial to review these combinations with your doctor to avoid harmful interactions. For instance, multivitamins might cause side effects when taken with birth control pills due to elevated estrogen levels. Always discuss all medications and supplements with your doctor.

Timing of Vitamin Intake

Dr. Poppers emphasizes the importance of timing when taking vitamins. Some vitamins can complement each other, while others might interfere with absorption. For example, iron is better absorbed with vitamin C but not with calcium. Always check the label on your vitamins for directions and ingredient details.

Both Dr. Poppers and Dr. Hensrud stress the importance of consulting your doctor before starting any vitamin or supplement routine. Most people can get their necessary nutrients from a balanced diet and don’t need extra vitamins unless they have a deficiency. A simple blood test can determine any deficiencies, and your doctor can recommend the best course of action.

In summary, if you’re feeling sick after taking vitamins, consider these factors and talk to your doctor for personalized advice.