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The regular supplementation with an antioxidant mixture decreases oxidative stress in healthy humans. Gender effect

The regular supplementation with an antioxidant mixture decreases oxidative stress in healthy humans. Gender effect

Clinica Chimica Acta; International Journal of Clinical Chemistry 349(1-2): 97-103

ISSN/ISBN: 0009-8981

PMID: 15469861

DOI: 10.1016/j.cccn.2004.06.009

Antioxidant consumption is claimed to be associated with improved antioxidant defenses and with the prevention of free radical-associated diseases. We evaluated if the regular supplementation with an antioxidant mixture modified oxidative stress parameters in healthy humans. Malondialdehyde (MDA), vitamin E (alpha-tocopherol), beta-carotene, and ubiquinol-10 were determined in plasma by HPLC; plasma 2-thiobarbituric acid reactive substances (TBARS) were evaluated fluorometrically. The supplement contained 106 IU vitamin E, 10 mg beta-carotene, 60 mg coenzyme Q-10, and 40 microg selenium. After a 10-day wash out period, 16 healthy, free-living adults (31-48 years old; 9 women, 7 men) consumed the supplement daily during 30 days. At day 20, plasma concentration of vitamin E (alpha-tocopherol), beta-carotene, and ubiquinol-10 increased 45%, 66%, and 104%, respectively, over baseline values. Plasma MDA concentrations were reduced at days 20 (25%) and 30 (32%). Plasma TBARS concentrations decreased steadily during the treatment, reaching at day 30 an 11% decrease compared to baseline. Segregating by gender, both MDA and TBARS plasma concentrations were higher in men than in women at baseline. However, such differences disappeared after 30 days of supplementation. The observed modifications in variables associated with oxidative stress are indicative of an effective antioxidant action of the used mixture of lipid soluble compounds, and gender differences suggest that men should optimize their antioxidants defenses earlier in life than women.

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Accession: 004361219

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