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I have read it is toxic in too high of dose, But I do know that it can be taken internally, because when my mother was a child they use to have cream of tarter sulfur wafers that people would take for mosquitoes and ticks. They do not make those anymore.
One guy, Ray Peat, said 200 mg per day for 3 days to wipe out Candida.
Maybe some of the older people here may know and can advise me.