The skin is also a producer of Vitamin D., the precursor of the hormone [[Endocrine System - Calcium Homeostasis - Anatomy & Physiology#Calcitriol (Active Vitamin D3)|Calcitriol]]. Ultraviolet light at a wavelength of 300nm is required to convert ''7-dehydrocholesterol'' to Vitamin D. | The skin is also a producer of Vitamin D., the precursor of the hormone [[Endocrine System - Calcium Homeostasis - Anatomy & Physiology#Calcitriol (Active Vitamin D3)|Calcitriol]]. Ultraviolet light at a wavelength of 300nm is required to convert ''7-dehydrocholesterol'' to Vitamin D. |