Aging is associated with functional and phenotypic alterations in the microcirculation, including endothelial dysfunction, oxidative stress, chronic low-grade inflammation, and microvascular rarefaction (reduced number and combined length of small vessels in a given volume of tissue)[289]
Gupta NA, Mells J, Dunham RM et al (2010) Glucagon-like peptide-1 receptor is present on human hepatocytes and has a direct role in decreasing hepatic steatosis in vitro by modulating elements of the insulin signaling pathway
More is not better, and overdosing carries risk
You can find a 1 pound canister (45 servings) for $8.99 thats about 20 cents a serving (Buy from Walmart, $8.99)
Hagen TM, Ingersoll RT, Wehr CM, Lykkesfeldt J, Vinarsky V, Bartholomew JC, Song MH, Ames BN: Acetyl-L-carnitine fed to old rats partially restores mitochondrial function and ambulatory activity