pubmed l carnitine l-carnitine: Nutrition, pathology, and health benefits L-Carnitine and Acylcarnitines: Mitochondrial Biomarkers
Description
Frozen shoulder usually starts with mild symptoms that progress in stages

Inflammatory regulation Food reactions, poor sleep, blood sugar swings, chronic stress, and unresolved infections can all keep the immune system on alert

Wu H-Y, Gao T-J, Cao Y-W, Diao J-Y, You P-H, Yao X-W

In summary, the polarized distribution of these transport systems between the luminal and abluminal membranes, and the fact that more than one transporter may carry the same substrate, ensures supply and excretion of AAs in and out of the brain, thereby controlling its homeostasis and proper function