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nightsurfer on 2009-09-03Evidence that vitamin D3 increases serum 25-hydroxyvitamin D more efficiently than does vitamin D2.
Trang HM, Cole DE, Rubin LA, Pierratos A, Siu S, Vieth R.
Am J Clin Nutr. 1998 Oct;68(4):854-8.
Although the 1.7-times
greater efficacy for vitamin D3 shown here may seem small, it is
more than what others have shown for 25(OH)D increases when
comparing 2-fold differences in vitamin D3 dose. The
assumption that vitamins D2 and D3 have equal nutritional value
is probably wrong and should be reconsidered.