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10.1097/MAO.0000000000002948 Otol

Longer-term causes of zinc toxicity include occupational exposure to zinc [147] and iatrogenic causes such as overprescribing of zinc-containing medication, zinc present in dental fixtures (though modern preparations in the UK and US are now zinc-free) and overconsumption of over-the-counter zinc supplements [148]

Long-term use of glutathione has occasionally been associated with lower zinc levels, so it is a good idea to have your levels checked periodically by your family doctor if you plan on long-term supplementation

For example, in one study in postmenopausal women, 600 mg of NAC daily improved various markers of immune function and oxidative stress