Supplement Interaction Checker
Tick the supplements and medications you take. You'll see which pairs compete for absorption, need spacing, or shouldn't be combined.
Results for 3 selected
Calcium + Iron Use caution
Calcium reduces iron absorption. Take them at least 2 hours apart.
Vitamin D + Calcium Works well together
Complementary: vitamin D increases calcium absorption.
Frequently asked questions
Which supplements should not be taken together?
Common examples are calcium with iron, high-dose zinc with iron or copper, and St. John's wort with 5-HTP. Many of these are about absorption, so taking them a few hours apart solves the problem.
Is this checker complete?
No. It covers well-documented interactions only. Always ask a pharmacist to review everything you take, including prescription and over-the-counter drugs.
Sources
Free tool for education only. It doesn't replace advice from your doctor or pharmacist.