is the important nutritious element necessary for normal activity of the person. Let's consider what role it plays in our life in what products contains and what the shortcoming and a surplus of this substance can turn back for health.

Compounds of cadmium, and especially its oxides, are toxic substances. The element has property to collect in an organism, gradually poisoning him. Treats immunotoxic elements.

often the reason of our feeling sick, fatigue, appearance of various diseases or just discomfortable feelings is the lack or a surplus of any given substance of an organism. However often we do not suspect about it as very small amount of people is inclined to controlling the food and, especially, to observe the correct balance of useful substances which are received from food by our organism.

physiological value of vitamin A is very high. It is a part of visual purple and provides normally sight. Takes part in exchange of proteins and also in synthesis of substances, important for an organism, – hormones; plays an important role in digestion of feedstuffs and promotes growth and formation of a young organism (for this reason it is called growth vitamin); takes part in development of immunity and maintains the normal physiological state of a protective (epithelial) cover of a body and mucous membranes.