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American Journal of Clinical Nutrition, Vol 47, 186-191, Copyright © 1988 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Vitamin and mineral status of trained athletes including the effects of supplementation

LM Weight, TD Noakes, D Labadarios, J Graves, P Jacobs and PA Berman
Department of Physiology, University of Cape Town Medical School, South Africa.

We measured serum concentrations of thiamin, riboflavin, nicotinic acid, pyridoxine, folate, cyanocobalamin, ascorbic acid, retinol, tocopherol, zinc, magnesium, copper, iron, and ferritin as well as hemoglobin, hematocrit, percentage transferrin saturation, and total iron-binding capacity in athletes who ingested a multivitamin and mineral supplement for 3 mo. All blood variables were normal and except for pyridoxine and riboflavin there were no significant changes in the blood concentrations of any other vitamins or minerals measured. This may have been due to variable interactions between the vitamins and minerals in the supplement that prevented their being adequately absorbed. There were no signs or symptoms of serious toxic side effects. We conclude that multivitamin and mineral supplementation was without any measurable ergogenic effect and that such supplementation is unnecessary in athletes ingesting a normal diet.


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M. M Manore
Effect of physical activity on thiamine, riboflavin, and vitamin B-6 requirements
Am. J. Clinical Nutrition, August 1, 2000; 72(2): 598S - 606.
[Abstract] [Full Text] [PDF]


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