Millions of Americans take multivitamins for better health. Health experts recommend daily multivitamins for many people because a balanced diet may not always provide all the necessary nutrients. Multivitamins can help fill gaps in your diet but they are not a substitute for healthy eating. For example, they often lack phytonutrients and fiber that are found in plant foods. Some people, such as women of childbearing age, vegetarians, and the elderly, are at higher risk for nutrient deficiencies. Multivitamins can help prevent conditions like anemia, neural tube defects, and vitamin B12 deficiencies. However, they might not prevent chronic diseases like heart disease or cancer. Research on their effectiveness is mixed, with some studies showing benefits and others not. If you have a medical condition or are undergoing treatment, talk to your doctor before taking multivitamins. Overall, while multivitamins can be a helpful supplement, they should not replace a healthy lifestyle.