This Is MS Multiple Sclerosis Community: Knowledge & Support

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The 2-to-1 calcium-to-magnesium ratio (2:1) was
first suggested by the French magnesium researcher
Jean Durlach5 as a high limit not to be exceeded, when
he warned against excessive calcium relative to magnesium
intakes; that is, one’s calcium intake from all
sources including food, water and supplements should
not exceed one’s total magnesium intake by more than
2 parts calcium to 1 part magnesium on a weight basis.

Source:
http://www.magnesiumeducation.com/files/pdfs/Final-Calcium-Magnesium-Ratio-3-1-12.pdf

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