This detailed biochemical diagram maps the metabolic pathway of folate and folic acid, starting with dietary folic acid. It highlights essential enzymes such as DHFR, SHMT1, TYMS, and MS involved in converting folic acid into various forms like dihydrofolate (DHF), tetrahydrofolate (THF), and 5-methyl-THF. The illustration also shows the connections to purine nucleotide synthesis, DNA/RNA synthesis, and the methylation cycle including the production of S-adenosylmethionine (SAM). The visual uses arrows, color-coded labels, and cellular membrane structures to clarify the biochemical transformations and cellular context.