The formula contains 3 important ingredients for preserving immunity, in high, strong doses. Each orange and grapefruit flavored effervescent tablet contains vitamin D, vitamin C and zinc. Vitamin D in its active form (vitamin D3) contributes to the normal function of the immune system and a healthy immune response, but also to many other bodily functions such as normal muscle function and the maintenance of normal bones and teeth. This vitamin is the focus of scientists: studies show that almost 50% of the population has an insufficient amount of vitamin D in the body, so domestic and international experts recommend taking vitamin D supplements. Maintaining a good concentration of vitamin D in the blood has never been more necessary! Vitamin C has a whole range of positive effects on maintaining health. It has been proven that vitamin C has an important effect in maintaining healthy immunity and provides antioxidant protection to our cells. It also contributes to the reduction of fatigue and energy production, normal function of the nervous system and preservation of the health of the skin, cartilage and bones. Supplementing with this important immune ally is especially recommended in the colder part of the year. Zinc is a powerful mineral with many important roles for a healthy body, and one of the most well-known roles is certainly the contribution to the function of the immune system. Zinc protects cells from oxidative stress, is important for healthy vision, hair, skin, nails.