Anhydroleucovorin is the predominant, biologically active form of vitamin B9 (folate) that is utilized by the body for a multitude of vital cellular functions, including DNA synthesis, repair, and methylation, as well as the production of key neurotransmitters; Anhydroleucovorin plays an essential metabolic role in the remethylation pathway, converting the amino acid homocysteine to methionine, and serves as the main folate form found in systemic circulation and transported into tissues for physiological use.