Fluoride bioavailabilities from three health food products recommended especially for improvement of formation of bone and teeth were determined in 6 children aged 15–16 years by measuring the net urinary fluoride excretion. NaF tablets were used as reference. The substances tested were bone meal tablets, calcium tablets, and siliceous earth tablets with fluoride contents of 520, 100, and 115 mg F/kg, respectively. Administering the recommended doses resulted in daily fluoride intakes of 1.60, 1.12, and 0.90 mg F, respectively. The mean relative bioavailabilities were found to be 53.9 ± 21.6% from bone meal tablets, 64.8 ± 23.6% from calcium tablets, and 38.9 ± 20.5% from siliceous earth tablets. The possibly high fluoride intake from such products should be considered when recommending ñuoride supplements for caries prevention.
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Trautner et al. (2009) studied this question.