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The absorptive response to graded doses of vitamin D 3 , 25(OH)D, and 1,25(OH) 2 D was measured in healthy adult men after treatment periods of eight, four, and two weeks, respectively. While no relationship was found between baseline absorption and serum vitamin D metabolite levels, all three vitamin D compounds significantly elevated 45 Ca absorption from a 300 mg calcium load given as part of a standard test meal. 1,25(OH) 2 D was active even at the lowest dose (0.5 g/day), and the slope wasdoi:10.1210/jc.82.12.4111 pmid:9398723 fatcat:3ubnpsdrvrhnvmtw6tinct5olq