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May we suggest you read two articles https://betweentwopines.wordpress.com/2012/05/21/magnesium-chloride/ If the URL does not transmit, please look up"Father Jose Chorr magnesium chloride two pines". Also http://www.naturesapproved.com/PDFDocs/k/KXKLL0RMMTL59MR3VAJ033PEXR47DKP6.PDF If the URL does not transmit, please look up "Health from the Ocean Deep Acres USA". We recommend your mother use liquid sea minerals, such as Aussie Trace Minerals http://seamineral.com/ (order in your state, Colo.; also available from other web sites); rather than the powder that Father Chorr used. The powder in the U.S. at least, appears to be sourced from the Great Salt Lake, which apparently may contain heavy metals.
Let your mother drink 1 teaspoon liquid sea minerals in a glass of water twice a day, beginning with once a day, as Father Chorr suggested, and increasing after a few days. If the stools are too loose, decrease to 1/2 tsp. once a day and increase more gradually.
Let your mother avoid eating meat; the most success with Parkinson's is with the vegetarian (no eggs) or vegan diet. Just be sure to include at least 2 tablespoons freshly ground flax seed every day in the diet for Omega 3 essential fatty acids, and drink extra water. We wish you and mother all success.