pyridoxal metabolic process vitamin B6 biosynthetic process pyridoxal biosynthetic process GO:0042821 pyridoxal anabolism pyridoxal biosynthesis pyridoxal synthesis biological_process pyridoxal formation The chemical reactions and pathways resulting in the formation of 3-hydroxy-5-(hydroxymethyl)-2-methyl-4-pyridinecarboxaldehyde, one of the vitamin B6 compounds. aldehyde biosynthetic process