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ensure accuracy. DRI Dietary Reference Intakes Calcium Vitamin D
SOURCES OF CALCIUM Ingested calcium comes from food sources and
dietary supplements. In this report dietary calcium refers to
both food sources and supplements combined (although some
researchers reserve the term dietary calcium to mean only food
sources) and is most often referred to as total calcium intake
for clarity. With more than one-half of the U.S. population
(Bailey et al., 2010)—and between 24 and 60 percent of Canadians
(2004 Canadian Community Health Survey, personal communication,
D. Brulé, Health Canada, April 29, 2010)—reporting use of
dietary supplements of some type, dietary supplements must be
taken into account when considering the sources of calcium in
the diet and, in turn, estimating total calcium intake. Current
estimates from 2003 to 2006 ind