This was because the supplement wasn't taken at the right time, when insulin would be spiked and muscle uptake would be adequate
Look for these qualities in a high-quality L-Carnitine supplement: Contains clinical-grade L-Carnitine or Acetyl-L-Carnitine Offers clear dosage instructions for tracking how much L-Carnitine per day you consume Contains no fillers, artificial sweeteners, or harmful additives Mixes easily with drinks or shakes for convenience The Science of Good Health L-Carnitine meets all of these criteria
Physiol Rev
How Much L-Carnitine Should You Take
31 Section Summary: L-carnitine benefits both sexes differently: men see improvements in sperm motility, count, and DNA integrity at 1,500-3,000 mg/day, while women benefit from enhanced egg quality and mitochondrial energy at 1,000-3,000 mg/day
Exploratory open label, randomized study of acetyl- and propionylcarnitine in chronic fatigue syndrome 19, 28