l carnitine molecule Acetylcarnitine L-Carnitine - Nadara Clinic

[DOI] [PMC free article] [PubMed] [Google Scholar] 67.Brass E.P., Scarrow A.M., Ruff L.J., Masterson K.A., Van Lunteren E

Therefore, complete endogenous carnitine biosynthesis occurs only in these tissues (kidney, liver, and brain), which can also form L-carnitine using -butyrobetaine imported from other cells that do not contain -butyrobetaine dioxygenase [40, 41]

[9] Bloomer et al. Glycine propionyl-L-carnitine modulates lipid peroxidation and nitric oxide in human subjects. International Journal of Vitamin and Nutrition Research. 2009 May;79(3):131-41. doi: 10.1024/0300-9831.79.3.131

I hope you have the wisdom to distinguish between the two