We consider it a precursor to glutathione
A number of small, poorly controlled studies have reported that either acute (dose given one hour before exercise bout) or short-term (two to three weeks) supplementation with L-carnitine (2 to 4 g/day) supported energy production, cardiorespiratory fitness, and endurance capacity during physical exercise (reviewed in 129)
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Thorley-Lawson DA, Allday MJ
South Med J 103(7):690692, 20531048, doi: 10.1097/SMJ.0b013e3181e21088
Some researchers combine it with GHRP-6 to get both elevated baseline GH (from the DAC version) and sharp pulsatile bursts (from GHRP-6)