About: http://webisa.webdatacommons.org/48527604

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Calcium requires the presence of vitamin D for maximum absorption.Although calcium is readily available in dairy products and other dietary sources, many Americans are calcium deficient.
http://www.w3.org/ns/prov#wasQuotedFrom	lef.org