The measure makes it illegal for social workers or licensed mental health professional to practice therapy treatments purporting to change the sexual orientation of children younger than 18.
The practice has been widely panned by critics who say it can lead to depression and anxiety in youths.
The U.S. Supreme Court has previously rejected challenges to both the California and New Jersey bans.
Article continues belowSupporters of the therapy have said the ban takes away parental choice.
Brown, who is the nation’s first bisexual governor, signed the measure Monday. A signing ceremony is scheduled for Thursday.
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