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How much zinc is in a zicam lozenge? 

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The assay is quick, convenient, and in principle measures functionally available zinc.
The effects of zinc lozenges should be further studied to determine the optimal lozenge compositions and treatment strategies.
The results of the present experiment indicate that the zinc tolerance test, that is, an unequivocal rise in serum zinc following per oral administration of this metal, provides the best indication of zinc status.
Principally, it is much better to relate the Zn requirements of the animal to the level of absorbable and metabolically available zinc.
It is concluded that: prospective efficacy of zinc lozenges can be predicted based upon readily determined ZIA factors and ZIAs; chemically different zinc lozenge formulations having greatly different ZIAs resulted in greatly differing results in clinical trials; mast cell granule-derived Zn 2+ ions are the foundation of the primary immune system; and high ZIA zinc acetate lozenges are beneficial for common colds.
Zinc absorption in humans could be improved by zinc complexation with gluconate.
The hypothesis is valid that major variations in ZIA from different zinc lozenge formulations used in clinical trials caused greatly differing results.
A reduction in zinc content at a certain zinc release rate results from an increase in zinc content of the ZnTCP phase in ZnTCP/HAP.