Authors: R. K. Marwaha, V. Sreenivas, D. Talwar, V.K. Yenamandra, A. Challac, R. Lakshmy, V.K. Sharma, G. Sethuraman
Published: British Journal of Dermatology, 2015
Link: https://onlinelibrary.wiley.com/doi/abs/10.1111/bjd.13887
Conclusion: The ultraviolet B rays of wavelength 290-320 nano meters responsible for synthesis of vitamin D in the skin is highest between 11am to 1pm. No increase in the serum vitamin D was observed following sun exposure in winter emphasising the need for vitamin D supplementation during winter months.