When we consume folic acid from food, it cannot be directly utilized by the human body.
Folic acid entering the human body requires a series of complex metabolic processes, gradually transforming into biologically active forms under the action of various enzymes.
Among them, active methylfolate is a key active form of folate converted in the human body. Only by converting into active methylfolate can it smoothly participate in various biochemical reactions in the human body and exert its physiological functions.
Reference material: The textbook "Biochemistry and Molecular Biology" provides a detailed explanation of the metabolic conversion pathways of folate in the human body.