L carnitine Effect, intake, dosage and much more BIOGENA International L Carnitine has become one of the most commonly asked about supplements over the past 18 months and I can see why when looking at all the research that has come out about it over the last 2ish years., L Carnitine Supplements Energy & Fat Metabolism ASN Australian Sports Nutrition There's a reason L carnitine keeps showing up in PCOS research Because PCOS is closely tied to insulin resistance, inflammation, and metabolic dysfunctionand L carnitine plays a role in energy metabolism and fat utilization.