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The U.S. Department of Agriculture recommends children ages 9 and older and adults consume at least 3 cups from the dairy group each day. Active teenagers with high calorie requirements of 3,000 calories or more may require 4 cups from the dairy group each day.
The USDA recommended three cups of milk a day only have 900mg of calcium. Some argue that only 1/3 of the magnesium is necessary. Mother nature seems to suggest it should be one to one. If the ratio for proper absorption were 1/3 magnesium to one calcium then no more than 300mg of that 900mg of calcium is usable.