What Supplements to Avoid When Taking Blood Thinners ConsumerLab.com Correct Answer: B. N acetylcysteine (NAC) Why is this High Yield? Acetaminophen (Paracetamol) is widely used, making toxicity a common ER presentation. 1. Mechanism of Toxicity: Acetaminophen is metabolized in the liver. Warfarin Basicmedical Key 6 Blood Thinner Interactions: Medications and Supplements to Avoid GoodRx Potential DrugNutrient Interactions of 45 Vitamins, Minerals, Trace Elements, and Associated Dietary Compounds with Acetylsalicylic Acid and WarfarinA Review of the Literature