Coenzyme Q-10 is the first antioxidative defence against free radicals. Its intake is often very low. Coenzyme Q-10 interferes with lipoperoxidation. Its content in tissues decreases during ageing. Supplementation with coenzyme Q-10 is recommended in ischaemic heart disease, as prevention of carcinogenesis, in several disorders of male infertility, in periodontitis, in neurodegenerative diseases and for sportsmen.

        Key words: ubiquinol Q-10, antioxidant, ischaemic heart disease, tumours, periodontitis.