Besides vitamin K, vitamin D is the first dietary supplement administered to our children directly at birth, or from the first weeks of life. From an early age, vitamin D plays a vital role in our childrens development. During breastfeeding , only infants whose mothers have sufficient vitamin D levels receive enough of the sunshine vitamin. After weaning, factors such as hours of sunshine, time spent outdoors, and, to a certain extent, diet are crucial in determining whether children have a good or poor vitamin D supply. Relevant studies show that a significant proportion of our children suffer from a vitamin D deficiency . The degree of deficiency varies seasonally, being more pronounced in winter and spring, and somewhat less pronounced in summer and autumn. Considering the enormous influence of an adequate supply of vitamin D, it is clear that such a deficiency should absolutely be avoided in ones own children. A good supply of vitamin D has been proven to be beneficial for: the maintenance of normal bones maintaining normal muscle function maintaining healthy teeth maintaining a strong immune system On the other hand, vitamin D deficiency is known to cause symptoms such as: Disorders of bone metabolism fatigue More frequent infections Reduced cognitive function Impaired muscle function