Vitamin D3 or cholecalciferol is a hormone involved in the mineralization of bones by its action of calcium fixation on mineralized tissues (bones, cartilage and teeth). Vitamin D is found in food (eggs, milk and oily fish) and in the human body in the form of a precursor transformed by the action of UVB rays. Due to our lifestyle (sedentary, low exposure to the sun), we are more and more exposed to the risk of being deficient in vitamin D. Consequences are bones rickets, decrease of muscle tone and weakened immunity. Our vitamin D is highly concentrated (1000% of NRV per day) and its liposomal form increase bioavaibility.