In the case of dried oyster and shiitake mushroom can decrease to the level of 69.99% and 68.40% , respectively. it was determined that dried mushroom can produce ergocalciferol under UVB irradiation. the highest content of vitamin D2 was observed in A.bisporus. Freeze-dried A.bisporus contained from 42.08 to 119.21 micro/g dw and hot-air dried mushroom contained from 21.51 to 81.17 micro/g dw vitamin D2