In a study published in the November 2005 issue of the Journal of the American Geriatrics Society, researchers found that intake of magnesium through diet and supplements is associated with increased bone density throughout the whole body. Results were most pronounced in older white adults. Over 2,000 black and white men and women, aged 70-79 years old participated. For every 100 mg per day increase in magnesium intake, there was a 1% increase in bone density. Recommended daily amounts of magnesium is 320 mg/day for women and 420 mg/day for men in this age group.