propionyl l carnitine heart L-Carnitine with Glycine Health and Energy Support, Muscle Strength and Endurance, 60 Veggie Capsules Glycine propionyl-L-carnitine - Wikipedia
Description
2020;76 Suppl 1:63-64
However, it is not entirely certain how many of these patients met ME/CFS criteria, suggesting that replication studies should be done in future to help us understand the genes, cellular processes, and tissues or cells that causally change the risk for developing ME/CFS

Carnitine: L-carnitine, which is synthesized endogenously, may become relatively depleted in MCADD as it remains conjugated to the accumulated medium chain fatty acids and is excreted as the acylcarnitine

Many users prefer taking it before workouts, but follow product instructions
