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Vitamins A and D are life-essential substances both for children and adults.
Vitamin A is of great importance for preserving normal eyesight, especially in darkness, growth, bone development, for normal functioning of reproductive system, supporting normal condition of epithelial coverings, prophylaxis of colds (influenza, bronchitis).Vitamin A is necessary for people whose profession is associated with strained visual activity (e.g. drivers, pilots, typographical workers, etc.); for them and also for teenagers the dosage of vitamin A should be doubled.Vitamin D influences the intracellular oxidizing processes, regulates mineral metabolism (especially calcium phosphoric  metabolism), supports fixed level of calcium and phosphor in blood, provides deposition of calcium in bones, normalizes the function of endocrine of endocrine glands, especially that of parathyroids. Severe vitamin D deficiency causes disturbance of the process of converting of cartilaginous tissues into bones, reduction of calcium and phosphor in bones, teeth growth problems, affection of nervous, cardiovascular and gastrointestinal tracts. The deficit of vitamin D may be caused by insufficient consumption of food containing it, malassimilation of this vitamin by body cells, lack of solar illumination, chronic liver diseases and intestinal malabsorption.

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