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The purpose of the work was to study the effect of benzene, toluene and xylene combined with acetone on ascorbic acid (AA) supply of constructive workers exposed to prolonged C-vitaminization. Vitaminization was carried out for 6 and 12 months with various doses of AA (50, 100 and 150 mg). Additional vitaminization induced a considerable increase in AA content in the blood plasma and raised its excretion with urine in the workers given 50 and 100 mg of vitamin C and not exposed to the harmful industrial factors. In painters working in the premises with an elevated content of aromatic hydrocarbons in the air, the higher level of AA in the blood plasma and urine could be attained only after prolonged additional vitaminization at a dose of 150 mg. The data obtained in experiments on guinea pigs also indicate advisability of increasing the daily preventive dose of vitamin C under industrial conditions with an elevated content of benzene and vapours of its methyl derivatives.

The authors studied actual nutrition and certain parameters of food (supply of vitamins A, E, C and the content of phospholipids, cholesterol, NEFA, triglycerides and cholesterol esters) for oil derrick installers working during summer at the "Mangyschlakneft" amalgamation. Incorrect structure of their nutrition and insufficient supply with vitamins A and C, revealed as the result of the study, necessitate rationalization of the nutrition for such workers.

The clinical trials of a new treatment and prophylactic diet at the Chimkent phosphorus plant have shown its high efficacy as compared to an old one. This was manifested in the improvement of the workers supply with retinol, tocopherol, ascorbic and nicotinic acids. The treatment and prophylactic diet produced a more efficacious action on the vitamin supply when being a constituent part of the corrected daily nutrition that of the factual nutrition.

The influence of the feeding of August rats with rice grown in highly saline soils, treated with different doses of industrial zinc salts, on the body providing with riboflavin, ascorbic acid, vitamins A, E and PP was studied. The meliorative-active matter was used in doses of 40 and 80 kg/hectare. The grain of the same sort grown under similar conditions but without the meliorative agent, served as control. It has been established that the feeding of the rats with rice grown in soils, treated with high doses of industrial zinc salts, produces unfavourable effect on the animals' body inducing serious disorders in vitamin metabolism.

It was shown that polyvitamin supplemented diets in which animal proteins had the biggest share and part of malassimilated polysaccharides had been replaced by easily assimilated disaccharides, promoted maintenance of the higher A/G ratio, low blood concentrations of lactic and pyruvic acids, and improvement of the parameters of acid-base metabolism in the people living under alpine conditions. After veloergometric test this group showed a less increase in the blood lactic acid content.