No, from the sun light exposure we never get excess of vitamin D. When UV-B rays from sun light strikes the skin, it converts 7-Dehydrocholesterol, a precursor of cholesterol into vitamin D.

Between 10,000 and 20,000 IU of vitamin D are synthesized during a 30 minutes of whole-body exposure of pale skin without clothing or sunscreen. If the person is brown or black it takes more time. These quantities are enough to satisfy the needs of the body.

What will happen if we are overexposed to sun light? The body has two mechanisms to prevent an excess of vitamin D. Further radiation with UV-B rays converts excess vitamin D in the skin to a variety of inactive metabolites. Moreover, the pigment melanin from the skin tissues decreases the production of vitamin D.

This controlled production of vitamin D is also one of our nature’s wonder.