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Centenary of Louis Pasteur's death and how vitamin and mineral supplements save lives Millions of lives could be saved or improved by adding Vitamin A, iodine and iron to diets. The World Bank estimates that it would cost less than a dollar a day to supplement one person. Iodine deficiency can cause mental problems while iron and Vitamin A are needed for sight and energy. Also how Pasteur's discovery of antibiotics has inspired modern biologists.