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Bottom line: collagen works incrementally
Respiratory chain enzymes in muscle of endurance athletes: effect of L-carnitine [PMID: 1329742] Laboratory literature summary: Respiratory chain enzymes in muscle of endurance athletes: effect of L-carnitine
Warnings Always read and follow the directions for use
pH can be measured with consumer-grade pH strips, but the relevant range (4.5-7.0) is broad enough that strip-resolution testing provides limited actionable information about whether the product meets the tighter tolerance bands specified in the USP monograph
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