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Adults can safely consume peppermint as a tea by steeping on teaspoon of the herb in hot water for 10 minutes. Four to five cups of the mix can be consumed each day to alleviate cold symptoms and post-nasal drip, and to help get rid of a metallic taste in your mouth.
Some prenatal vitamins can also cause a persistent metallic taste, so ask your doctor about switching vitamins to help return your taste buds to normal. You also may notice a metallic taste if your sense of smell has recently been impaired. Smells and flavors are closely related, and nerve endings on the tongue can sense irritation within the nasal region. A metallic taste or sensation could be the result of a cold, nasal infection, runny nose due to allergies, sinusitis or nasal polyps [source: Danoff ].