The Excretion Patterns of Vitamin B6 and B12 in Preadolescent Girls

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Abstract
During a 36-day study the excretion patterns of vitamin B6 and B12 were investigated in 12 preadolescent girls. Diets composed of foods from plant sources provided 2 levels of protein, 22.1 and 40.3 g/day, and 2 levels of vitamin B6, 1.30 and 1.73 mg/day, and were supplemented with vitamin B12 to give an intake of about 6 µg/day. The urinary excretion of both vitamin B6 and 4-pyridoxic acid varied considerably from period to period for each subject. The average urinary excretion of vitamin B6 was 1.1% of the lower intake and 0.79% of the higher intake, but the actual amounts were similar. The small excretion rates of both vitamin B6 and pyridoxic acid may be indicative of intakes near the minimal requirement for these subjects. The average amounts of vitamin B12 excreted were 0.14 and 0.12 µg/day for the low and high protein diets, respectively, and represented 2.3 and 2.0% of the intake.

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