l-carnitine or l-arginine which is better The 5 Best Supplements Pure L-Arginine Plus L-Carnitine -
Description
Unlike regular L-tyrosine, which has poor solubility and limited absorption, the acetylated form crosses the blood-brain barrier more efficiently and maintains higher plasma concentrations for extended periods

F., Horrichs A., Somssich I
Arf1 coordinates fatty acid metabolism and mitochondrial homeostasis

see Figure 1 ) are excreted by the kidneys