Concretely vitamin D3 is essential for many physiological processes even at cell level so they have a normal functioning. Sunlight has different wavelength or types of radiation, but the variety of sun rays which can help us to have normal levels of vitamin D3 is UVB, UVA are the damaging ones. There are certain time of the day and seasons of the year when UVB are more present. This wavelength is the suitable one to induce the transformation of certain fat compounds into this precious vitamin. We have also to avoid sunburns that even can create skin cancer. Being careful we have to spend between 5 and 10 minutes per day and increasing up to 20 minutes daily.
Sun exposure can vary depending on the type of skin, its pigmentation can determine the time of exposure, so darker skin can spend more time under the sun up to half an hour.
The inclination of the sun radiation is another factor and this has to be higher of 50% to receive a greater amount of UVB so that it can stimulate the vitamin production in the body. When the inclination is less, the benefits are lower. This way, in winter there are less UVB rays because this inclination level of sun radiation. The latitudes of location can also determine the concentration of the desirable radiation. In temperate areas of the planet between spring and autumn we can obtain better UVB radiation than in the rest of the year. Living in cold areas of the planet is a problem because of the climate and the sun inclination both don’t allow us having the desirable radiation. Bad climate on the other hand, make people being depressed easily and that affects the immune system, aggravating the problem of cancer. Sun is a source of life if it’s used wisely and in moderation.