Those naysayers can naysay this bit I found on a potters' site today. I will be trying it. Potters use lots of minerals and some can be toxic - like the air in any city is toxic.

"Talked with an ole time potter pal at our festival this past weekend and wanted to pass on a tip. Our fellow clay artist had a hair sample analyzed for mineral content and came up very high aluminum and cobalt and some other marginal readings. Not surprising after 40 years of mixing glazes but he found a simple fix.
Apple Pectin. Cheap- readily available and effective.
One year of taking 4 tabs a day he had another sample done.
All minerals within normal ranges."