How much sun is suitable?

According to a new study published a few days ago in the Proceedings of the National Academy of Sciences in the United States, previous sun exposure guidelines for optimal vitamin D synthesis based on skin sample studies may need to be revised
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Researchers at King’s College London, UK, conducted a study with the support of Guy and the St.
Thomas Biomedical Research Center of the National Institute of Health, which tested the optimal ultraviolet radiation (UVR) wavelength of human skin to produce vitamin D under the sun
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Public health advice on sun exposure considers both risks and benefits
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The link between specific UVB wavelengths and vitamin D synthesis was established in skin sample studies more than 30 years ago
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In this study, a research team led by Professor Antony Young of King’s College London exposed 75 healthy young volunteers to five different artificial UVRs (with different amounts of UVB), partially or whole-body, before, during and during the test.
After testing the level of vitamin D in the blood of volunteers to assess the pros and cons of sun exposure, including the trade-off of vitamin D synthesis with the risk of skin sunburn and skin cancer
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After that, they compared the results of the study with the results predicted by previous in vitro vitamin D studies and found that the previous study did not accurately predict the benefits of UV exposure
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"Our research shows that the calculation of risk and return of the sun irradiation may need to be reassessed
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Related paper information: https://doi.