Abstract
The present investigation was undertaken to study the effects of TTFD and citric acid on the urinary vitamin C and oxalic acid excretion in adult humans. In the first experiment, 4 adults were ingested with 50mg of TTFD daily for 4 days. In the second experiment, 4 adults were ingested with 5 mg of citric acid for 4 days. By the administsation of TTFD, rate of utilization of vitamin C was steadily increased, and the amount of urinary oxalic acid also increased. By the administration of citric acid, the rate of vitamin C utilization was lowered, especially in the patients of anemia, and it caused the deficiency of vitamin C, which suggests some disturbances of its utilization. The influence of citric acid was considerably strong.
