l carnitine choline TMAO biosynthesis. L-carnitine and are derived from the diet ALCAR HCl Powder - Acetyl

Efficacy of L-Carnitine for Dilated Cardiomyopathy: A Meta-Analysis of Randomized Controlled Trials

Given his results, while I might try just high dose serine first, adding NAC, nicotinamide riboside, glycine and carnitine also makes sense, as Mardinoglus research suggests

Ingestion of Free Amino Acids Compared with an Equivalent Amount of Intact Protein Results in More Rapid Amino Acid Absorption and Greater Postprandial Plasma Amino Acid Availability Without Affecting Muscle Protein Synthesis Rates in Young Adults in a Double-Blind Randomized Trial

Unlike endocrine peptides, GHK-Cu does not act through a single receptor system