vitamin d

He discovery of the semiquinone form of CoQ in the mitochondria raises the question of a possible role of the ubisemiquinone radical in the generation of superoxide radicals in the course of respiration. However, to date there is no convincing evidence that CoQ acts as a pro-oxidant in vivo.

Recent regulations on supplement use in Europe address the necessity to include information on dietary intake to derive maximum amounts for vitamins and minerals in food supplements. Therefore, information about supplement use in Germany, as well as data on micronutrient intake (from supplements and traditional foods), in particular of persons who use several supplements, is examined in detail. As part of the representative German National Health Interview and Examination Study 1998, in the Nutrition Survey 4030 persons, aged 18-79 years, were asked about their dietary habits, including vitamin and mineral supplement use, in a personal computer-aided interview. About 43% of the population reported using supplements at least once in the observation period of 12 months. Women use supplements more frequently than men. A relatively small group uses several supplements, most often vitamin plus multivitamin supplements. Considering single nutrients, vitamin C is most commonly consumed from more than one supplement.

Beta-carotene is a precursor to vitamin A that has antioxidant properties, helping the body deal with unstable chemicals called free radicals.

Zinc (Zn) is an essential trace mineral. The human body has between 1.5?2.5 g Zn, making it nearly as abundant as iron. It is highly concentrated in specialized areas of the brain, pancreas and adrenal gland, but is present in all cells, particularly in the nucleus. Zinc has structural, catalytic (enzymatic) and regulatory roles. About 1% of the human genome codes for zinc finger proteins, where zinc provides a structural role for regulatory functions. Over 60 enzymes require zinc for activity, including the RNA polymerases. Zinc is actively taken up by synaptic vesicles, supporting a role in neuronal activity and memory. Zinc metabolism is altered during disease and physical stress through hormones, cytokines and toxins, presumably as part of a host defense response.

Vitamins and minerals are an important component of human nutrition..