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    Why Do I Have a Bad Taste in My Mouth?

    Vitamins and dietary supplements

    Many vitamins and supplements can cause a metallic taste in your mouth, especially if you take them in large amounts.

    Some of the most common vitamins and supplements that can cause a metallic taste include:

    • calcium
    • chromium
    • copper
    • iron
    • multivitamins or prenatal vitamins that contain heavy metals
    • vitamin D
    • zinc, which can also cause nausea

    Many OTC and prescription medications can also cause a bitter or metallic taste in your mouth.

    OTC medications that can affect your sense of taste include:

    Prescription medications that can cause an unusual taste in your mouth include:

    There are many chemotherapy medications used to treat cancer.

    Treatment with chemotherapy usually involves a combination of these, and many of them can cause a metallic or sour taste.

    Radiation therapy can also cause a metallic taste, especially when it’s used to treat head and neck cancers.

    Any unusual tastes caused by chemotherapy or radiation usually go away once you’re done with treatment.

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