l carnitine for insulin resistance L-Carnitine, Malibu Beach, 12 fl oz (360 ml) Sports Performance Bulletin - Other
Description
But only LC was shown to have treatment effects with statistical significance

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2016;11(5):e0153380

Mutomba MC, Yuan H, Konyavko M, Adachi S, Yokoyama CB, Esser V, et al
Understanding these mechanisms will provide a deeper understanding of the role of L-Carnitine in male reproductive health and may have the way for more targeted therapeutic interventions

They are all ubiquitous except -butyrobetaine hydroxylase is absent from cardiac and skeletal muscle