And there are some risks involved

According to the FDA, the active ingredients in many dietary supplements can have “strong biological effects” and in certain situations can be particularly unsafe. Combining supplements with prescription and/or over-the-counter medications, replacing prescriptions medications with supplements and taking too much of a certain supplement (like vitamin A, D and iron) are all examples of circumstances that could lead to harmful or even life-threatening results. Additionally, the FDA says that some supplements can cause unwanted effects before, during and after surgery.