A nurse is providing teaching to a client who has a new prescription for levothyroxine for hypothyroidism. The nurse should instruct the client to avoid which of the following herbal supplements?

A. Saw palmetto: Saw palmetto is commonly used for benign prostatic hyperplasia (BPH) and does not significantly interact with levothyroxine. Therefore, it does not need to be avoided when taking levothyroxine. B. Garlic: Garlic is generally considered safe and may even have benefits for cardiovascular health. It does not interfere with the effectiveness of levothyroxine, so it does not need to be avoided. C. Cranberry: Cranberry is not known to interact with levothyroxine. While it can affect the absorption of some medications, there is no significant evidence to suggest it would reduce the effectiveness of levothyroxine. D. Soy: Soy products can interfere with the absorption of levothyroxine and may decrease its effectiveness. Clients taking levothyroxine should avoid consuming large amounts of soy or soy-based products, particularly within a few hours of taking the medication.