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What kind of zinc is in Preservision? 

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Papers (6)Insight
Journal ArticleDOI
Michael Hambidge, Nancy F. Krebs 
40 Citations
In the case of zinc, these can serve the additional role of confirming the underlying zinc deficiency state.
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.
These observations are best explained by a role for zinc in gene regulation possibly through zinc dependent enzymes.
It is thought that zinc may play a part in this process.
This process is probably independent of the zinc concentration.
Zinc absorption in humans could be improved by zinc complexation with gluconate.