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While some forms are designed for improved absorption, systemic levels may not rise as efficiently as with injectable methods
Further, kinetic studies of seleno-GPxs have revealed that the rate constant for the reaction of hydroperoxides with the selenolate of Sec is twothree orders of magnitude higher than the combined rate constant of the successive reactions of selenenic acid with the two molecules of GSH [8,9,10,11,12,13,14,15,16,17,18]
Reputable vendors provide certificates of analysis (COAs) showing actual peptide content, purity, and endotoxin testing results
But I don't know of any reports that bisglycinate can be neuroprotective
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