The production of vitamin D-3 in the human body or otherwise "vitamin of the sun", is produced only photochemically and is done through the exposure of the skin to sunlight and specifically to ultraviolet UVB radiation. However, its production capacity varies.

Very often, light-skinned people experience significant vitamin D-3 deficiency or deficiency due to the use of strong sunscreens or limited sun exposure in the morning and afternoon, which is dominated by ultraviolet A and to a lesser extent UVB. Dark-skinned people, who need more time in the sun to get their skin to make adequate levels of vitamin D-3, have consistently low levels of vitamin D. In addition, older people are often deficient in vitamin D-3 as they do not receive adequate exposure. in the sun or are severely malnourished.

Vitamin D-3 or cholecalciferol is an osteoprotective vitamin, which contributes significantly to the healthy growth and maintenance of bones, bone density and the maintenance of blood calcium levels. This valuable vitamin determines the regulation of the immune system, the secretion of insulin, actively contributes to healthy cell growth, has immunomodulatory properties and supports the normal functioning of the nervous system.

Vitamin D-3 is found in few foods, mainly animals such as fish, liver and egg yolk. For those who have difficulty reaching the recommended levels through sun exposure and diet, taking a diet supplement can help boost your vitamin D-3 intake.