Any process that activates or increases the frequency, rate or extent of the chemical reactions and pathways resulting in the formation of juvenile hormone.
Synonyms:
exact_synonym:
positive regulation of juvenile hormone anabolism; positive regulation of juvenile hormone biosynthesis; positive regulation of juvenile hormone formation; positive regulation of juvenile hormone synthesis; up regulation of juvenile hormone biosynthetic process; upregulation of juvenile hormone biosynthetic process
narrow_synonym:
activation of juvenile hormone biosynthetic process; stimulation of juvenile hormone biosynthetic process