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Description
10.1016/j.bbr.2015.01.028 Behav
It is more water soluble (so it doesnt include propylene glycol)

Increased Blood Flow and Oxygen Delivery L-Carnitine has been shown to favorably affect the production of nitric oxide which is the major facilitator of blood flow to the muscles during the workout
Men should just be aware that they are using it off-label, meaning we rely on smaller studies and clinical experience rather than formal FDA-vetted data