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J Clin Endocrinol Metab. 2004 Nov;89(11):5387-91. doi: 10.1210/jc.2004-0360.

Vitamin D2 is much less effective than vitamin D3 in humans.

Armas LA, Hollis BW, Heaney RP

https://doi.org/10.1210/jc.2004-0360

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