Abstract
Morning urine on an empty stomach taken from males aged 19–25 years, fed on a diet deficient in ascorbic acid, was found to contain a small proportion both of this acid and of vitamin B5, excreted in the form of lactone of 4-pyridoxic acid. When these subjects were given 100 mg of ascorbic acid daily, there was a statistically significant increase in the amount of ascorbic acid and 4-pyridoxic acid excreted in the morning urine.
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