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In page Dysgeusia:

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Another primary cause of dysgeusia is zinc deficiency. While the exact role of zinc in dysgeusia is unknown, it has been cited that zinc is partly responsible for the repair and production of taste buds. Zinc somehow directly or indirectly interacts with carbonic anhydrase VI, influencing the concentration of gustin, which is linked to the production of taste buds.[1] It has also been reported that patients treated with zinc experience an elevation in calcium concentration in the saliva.[1] In order to work properly, taste buds rely on calcium receptors.[2] Zinc “is an important cofactor for alkaline phosphatase, the most abundant enzyme in taste bud membranes; it is also a component of a parotid salivary protein important to the development and maintenance of normal taste buds.”[2]