boiga dendrophila melanota Western mangrove cat snake (Boiga melanota) Boiga melanota - Wikipedia

For decades, scientists have been using radiolabeled analogs to trace lipid metabolism along various pathways (Schoenheimer, 1937

doi: 10.1186/1550-2783-5-8

Urology 78(6):13201325 Aboulmaouahib S, Madkour A, Kaarouch I, Sefrioui O, Saadani B, Copin H, Benkhalifa M, Louanjli N, Cadi R (2018) Impact of alcohol and cigarette smoking consumption in male fertility potential: looks at lipid peroxidation, enzymatic antioxidant activities and sperm DNA damage

One thing to be wary of is that C-ratings can be used as a bit of a marketing tool so since the concept is a little more obtuse - I'd recommend comparing within a brand but not so much between brands

PURE & POWERFUL L-CARNITINE 2000MG: Each serving delivers 2000mg Carnipure L-Carnitine Tartrate from Lonza Switzerland, clinically researched for fat metabolism, weight loss and enhanced energy

Varrick, Colonel, at Battle of Stillwater-Rupture with Arnold, 056