Biological process

positive regulation of haem biosynthetic process, positive regulation of heme anabolism, positive regulation of heme biosynthesis, positive regulation of heme formation, positive regulation of heme synthesis, up regulation of heme biosynthetic process, up-regulation of heme biosynthetic process, upregulation of heme biosynthetic process

Any process that activates or increases the frequency, rate or extent of the chemical reactions and pathways resulting in the formation of heme.