A view that puberty blocker use for trans youth in New Zealand needs tighter supervision. 

New Zealand's use of puberty blockers is seven times higher than comparable countries. 

Paediatric Endocrinologist, Paul Hofman says they shouldn't be banned as they can be effective in some cases. 

He told Heather du Plessis-Allan it's not settled science. 

Hofman says the evidence for puberty blocker's efficacy is not as strong as many think.

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