l carnitine an SirenLabs® L-Carnitine Elite Burn L-Carnitine, 500 mg Veggie Capsules

In the present study, dietary L-carnitine supplementation increased the protein content of the whole body in the feeding trial, and did not affect the mRNA expressions of genes associated with protein and amino acid catabolism

Research-only note: L-Carnitine is not FDA-approved for therapeutic use

This is backed up by another study on brain function, which found that creatine is most likely to exert an influence in situations whereby cognitive processes are stressed. A review suggested that creatine supplementation might also help the brain recover from trauma and shows promise for combating age-related cognitive decline

In adult brain, the carbons from the acetyl moiety can be used to synthesize fatty acids, which are preferentially incorporated into structural lipids, rather than oxidized via -oxidation [45, 56]

Kattoor AJ, Pothineni NV, Palagiri D, Mehta JL