Something like 50% of adults do not get enough magnesium. "Up to 50 percent of US population is magnesium deficient" https://www.sciencedaily.com/releases/2018

Something like 50% of adults do not get enough magnesium. "Up to 50 percent of US population is magnesium deficient" https://www.sciencedaily.com/releases/2018/02/180226122548.htm https://www.sciencedaily.com/releases/2018/02/180226122548.h... There are numerous sources for this figure; google if you want others.