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Melian;

"The sun emits two types of wavelengths at different periods in a day: UVA rays and UVB rays. Your body requires UVB for vitamin D production. UVA rays, on the other hand, have longer wavelengths and can penetrate the ozone layer, as well as clouds and pollution. Frequent exposure to this type of wavelength increases your risk of skin cancer and photoaging.

Occasional exposure of your hands and face to the sun does not constitute appropriate sunlight exposure. To optimize your levels, large portions of your skin needs to be exposed to the sun. However, over exposure to the sun can result in sunburn, which will increase your risk for skin cancer and premature skin aging.

Once you get the proper amount of sunlight, your body will stop producing vitamin D because of its self-regulating mechanism. Here are other important factors in safe sunlight exposure:

Time – The best time to expose yourself to the sun is as near to solar noon as possible (during Daylight Saving Time, solar noon is typically around 1 pm). UVB rays, unlike UVA rays that are present all throughout the day, are very low in the morning and evening, and are abundant during midday – around 10:00 am to 2:00 pm. Expose yourself to direct sunlight between these times for a short period, and you will have produced the most vitamin D3.

Skin pigmentation – Fair-skinned people can potentially max out their vitamin D production in just 10 to 20 minutes, or when their skin has turned the lightest shade of pink. However, if you have darker skin, you likely need to remain in the sun longer.

Sensitive body parts – The skin located around your eyes is thinner compared to other areas on your body. Since it has a small surface area, it will not do much to contribute to vitamin D production. You need to protect this part of your face, as it is very prone to photoaging and premature wrinkling. I recommend using a safe sunblock or wearing a cap that will keep your eyes in the shade.

If you get sunburned, aloe vera is one of the best remedies to help repair your skin. This plant is loaded with powerful glyconutrients that will induce healing. I suggest deriving the gel from a fresh plant.

Using soap – When UVB rays strike the surface of your skin, your skin will then convert a cholesterol derivative, which will turn into vitamin D3. However, the produced vitamin D3 does not immediately enter your bloodstream. It may take up to 48 hours before the vitamin D3 penetrates into your bloodstream. ...Snip more at link.