What is the difference between Citrulline and L-Citrulline?

The primary differences between Citrulline and L-Citrulline lies in their chemical structures and forms. Citrulline is a non-essential amino acid, meaning that it can be synthesized by the body from other amino acids, and is naturally found in certain foods like watermelon. Whereas L-Citrulline is the biologically active form of citrulline, the ‘L’ in L-Citrulline refers to it’s chemical structure, specifically the orientation of its molecular bonds.