Leriva Pharma Immuvit Vitamin D3 is a food supplement containing Vitamin D3 4000 IU in 60 capsules. Vitamin D3 is naturally produced by our body when our skin is exposed to ultraviolet radiation. Modern lifestyle, the use of sunscreens and other factors often lead to Vitamin D3 deficiency, which is why it is important to supplement it with food supplements. Vitamin D3 contributes to: Normal absorption and utilization of calcium and phosphorus. Maintaining normal calcium levels in the blood. Maintaining the normal condition of teeth, bones and muscle function. Normal functioning of the immune system. The process of cell division. Vitamin D3 in dietary supplements usually comes from animal sources, while the Vitamin D3 in the Immuvit Vitamin D3 (cholecalciferol) supplement is 100% plant-based.