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L-Carnitine is a vitamin-like nutrient that is synthesized in the body, using the amino acids lysine and methionine as precursors. Because the body produces L-Carnitine on its own, it cannot be classified as a vitamin, even though it has functions similar to B vitamins. Fumarate is also a natural compound found in the body. Fumarate serves as an intermediate in the Krebs cycle, a key cellular energy-producing process. L-Carnitine and Fumarate both play important roles in energy metabolism.

Best L-Carnitine contains BIOSINT L-Carnitine Fumarate, which is made in Italy by Sigma Tau Health Science. It is derived from a base of pharmaceutical-grade L-Carnitine manufactured using an FDA-approved process that fully complies with international monograph standards for carnitine production. No biotechnology or genetically modified organisms are involved. L-Carnitine Fumarate is certified GMO free, BSE safe, pesticide free and Kosher. It is also ISO 9002 certified and NNFA GMP certified. L-Carnitine Fumarate is highly stable and bioavailable.

Known as a global leader in L-Carnitine research, Sigma Tau holds numerous patents for production of L-Carnitine, and its L-Carnitine derivatives are used in clinical trials. Sigma Tau Health Science has the only FDA-approved (1984) pharmaceutical batch process system for consistent L-Carnitine quality, and has been manufacturing L-Carnitine derivatives for 30 years.