People use green tea—either as a beverage or in supplement form—to support cholesterol, promote weight loss, and for other potential health benefits. But even natural products like green tea can interact with medications, so it's important to know which ones to be careful with.

1. Warfarin

Warfarin, a blood thinner, can interact with green tea:

Why it matters : Green tea contains vitamin K , which can affect how warfarin works. Warfarin is known as a narrow therapeutic index drug. This means the difference between an effective dose and a dangerous dose is very narrow. When taking warfarin, it's typically advised to maintain a consistent vitamin K intake.

What could happen : Drinking green tea may cause changes in your international normalized ratio (INR), a measure of how lon

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