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nightsurfer on 2009-10-05Plasma vitamin D and 25OHD responses of young and old men to supplementation with vitamin D3.
Harris SS, Dawson-Hughes B.
J Am Coll Nutr. 2002 Aug;21(4):357-62.
Conclusions: There appears to be no age-related impairment among men in the absorption or metabolism of 20 µg/day of vitamin D3 taken orally for at least eight weeks.