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Vitamin D4 is a vitamin produced in fungi from the UV irradiation of 22,23-dihydroergosterol (Provitamin D4).1 It is produced by several mushroom species including A. bisporus, F. velutipes, G. frondose, and C. cibarius and in S. cerevisiae. Vitamin D4 is 60% as active as vitamin D3 (Item No. 11792) at healing rickets in rats.
WARNING This product is not for human or veterinary use.
1. Photobiology of vitamin D in mushrooms and its bioavailability in humans. Dermatoendocrinol. 5(1), 165-176 (2013).