Smile Food Supplement D3 5000IU + K2 - 60 Capsules The Smile D3 5000IU + K2 dietary supplement provides essential vitamin D3 in combination with vitamin K2. Vitamin D3: Vitamin D3, also known as the “sunshine vitamin,” is produced in the human body by exposing the skin to sunlight, particularly UVB ultraviolet radiation. However, production capacity varies, with fair-skinned individuals often being deficient due to the use of strong sunscreens or limited sun exposure. Dark-skinned individuals require a longer period of sun exposure to produce sufficient levels of vitamin D3. Benefits of vitamin D3: Important for developing and maintaining healthy bones Contributes to bone density and maintaining calcium levels in the blood Regulates the immune system and insulin secretion Supports healthy cell development It has immunomodulatory properties and supports the functioning of the nervous system.Vitamin K2: Vitamin K contributes to the regulation of proteins in the arteries and the health of the cardiovascular system. Vitamin K deficiency can lead to arterial calcification, as calcium present in the blood can deposit on the walls of the arteries.