Vitamin D synthesis

Vitamin D synthesis begins in the skin when it is exposed to sunlight, specifically ultraviolet B (UVB) rays. These rays convert a cholesterol derivative in the skin into pre-vitamin D3, which then transforms into active vitamin D through processes in the liver and kidneys. Vitamin D is crucial for maintaining healthy bones and immune function. It can also be obtained from certain foods and supplements, but sunlight exposure is a key natural source. Balancing sun exposure is important, as too much can increase skin cancer risk, while too little can lead to deficiency-related health issues.