Too much sun, or ultraviolet (UV) radiation is bad for you as it can cause the onset of skin cancer, sun erythema, skin discoloration, and skin aging. On the other hand, sun exposure is also good for receiving doses of vitamin D, reducing blood pressure, and improving the treatment of some diseases.
So, how much sun is enough to be beneficial, but not too much to damage our health?
Researchers of the Solar Radiation Research Group at the Polytechnic University of Valencia have come to an answer! They suggest that 10 to 20 minutes of sun exposure in the spring and summer times are enough to obtain the recommended daily doses of vitamin D. In the winter months however, almost two hours of sun exposure are needed to receive sufficient values.
This exposure equates to the current daily recommended dose of vitamin D, which is 1,000 IUs (international units).
The researchers explain that getting enough sun exposure is important, because very few foods contain vitamin D, and because the sun is our main natural source of the vitamin.