Vitamin D2 in Mushrooms
Two bits of vitamin D2 news:
1. Vesanto Melina, author of Becoming Vegan, kindly passed on a study about vitamin D2 in UV-irradiated mushrooms. 28,000 IU of vitamin D2 was fed to subjects either in the form of a supplement or from mushrooms, one time per week for four weeks. Vitamin D levels increased from 34 to 57 nmol/l in the mushroom group, and from 29 to 58 nmol/l in the supplement group (recommended levels are 40 – 50 nmol/l). The placebo group’s vitamin D2 levels decreased over the course of the study (1).
2. Dole is now making a Portobello Mushroom Powder with the RDA of 600 IU per teaspoon. (Link)
1. Urbain P, Singler F, Ihorst G, Biesalski HK, Bertz H. Bioavailability of vitamin D₂ from UV-B-irradiated button mushrooms in healthy adults deficient in serum 25-hydroxyvitamin D: a randomized controlled trial. Eur J Clin Nutr. 2011 Aug;65(8):965-71. doi: 10.1038/ejcn.2011.53. Epub 2011 May 4. | link