One study found that 300mg/day of GSH for 16 weeks improved liver health and function in people with non-alcoholic fatty liver disease (NAFLD), while another study found 250mg GSH per day taken orally was beneficial for skin health and aging 8, 9
As there was no differences of islet area nor islet density between groups (Fig
65 Tryptophan
Based on reading some of the websites it seems that their hypothesis is that because ALC is involved in the Krebs cycle in the mitochondria, which gets energy from fatty acids, that means ALC helps burn fat. There is not much in the scientific literature on this topic, but I did come across an article that found no difference in metabolic parameters in study participants taking L-carnitine versus controls (not exactly the same things as acetyl-L-carnitine, but they are used somewhat similarly in the body, there just isnt the extra acetyl group in the L-carnitine)
There are many tests that give important insight into kidney function
As this internal fat reduces, your midsection may appear leaner even before subcutaneous fat (the layer directly under your skin) decreases substantially