“This bill bans nonscientific ‘therapies’ that have driven young people to depression and suicide,” Gov. Jerry Brown said in a statement on Saturday after he signed the bill into law. “These practices have no basis in science or medicine, and they will now be relegated to the dustbin of quackery.”

The law, which is to take effect on Jan. 1, states that no “mental health provider” shall provide minors with therapy intended to change their sexual orientation, including efforts to “change behaviors or gender expressions, or to eliminate or reduce sexual or romantic attractions or feelings toward individuals of the same sex.”

“Reparative therapy is junk science being used to justify religious beliefs,” said Wayne Besen, the director of Truth Wins Out, a gay advocacy group.

The California law is a milestone, but only a first step, Mr. Besen said, because the ideas in reparative therapy have been widely adopted by church ministries and others promoting the idea that homosexual urges can be banished.

Legislators in New Jersey and a few other states have discussed introducing similar bills to ban the use of the therapy for minors, Mr. Besen said.

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