l-carnitine brain spots Effects of Long-term Acetyl-L-carnitine Administration in Rats: I. Increased Dopamine Output in Mesocorticolimbic Areas and Protection toward Acute Stress Exposure Experimental and Therapeutic Medicine
Description
This makes it water-soluble, allowing it to be excreted in bile

Nat Commun 11 , 4337 (2020)
Can you take L-theanine on an empty stomach

One case study found that an infant with delayed development had slow gut motility along with other gastrointestinal symptoms, such as infrequent bowel movements, and was found to have low levels of carnitine
