Biofactors play a vital role in the body and contribute to the smooth running of our metabolic processes. Therefore, nutritional associations promote reference values which should facilitate a healthy metabolism. Iron, for example, is essential for producing hemoglobin and thus for our body's oxygen supply. Vitamin C supports the absorption of iron from our diet, plays a role in wound healing and is an antioxidant. Some biofactors support the normal functioning of the immune system in different ways. Vitamin D (which is, by the way, both a vitamin and a hormone) is produced by the body with the support of sunlight, helps the intestine to absorb calcium, phosphorous, and magnesium – just to name a few of its many functions in the body. In this way vitamin D allows these biofactors to complete their important tasks in our bone formation. Infants, in particular, have a relatively higher need for vitamin D because of their growth. The B-vitamins such as vitamin B12, benfotiamine (a lipid-soluble thiamine precursor), vitamin B6, and folic acid have, among other things, a crucial influence on nerve function and regeneration, as well as the maintenance of a healthy metabolic status in energy supply and blood formation.