Vitamin d is synthesized when modified cholesterol molecules in the skin are irradiated by what type of light?

Vitamin D is synthesized when modified cholesterol molecules in the skin are irradiated by ultraviolet B (UVB) light from the sun. This process begins when UVB rays convert 7-dehydrocholesterol in the skin into previtamin D3, which is then transformed into active vitamin D through further processes in the liver and kidneys. Adequate exposure to sunlight is essential for maintaining optimal vitamin D levels in the body.