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Puberty blockers are an "unregulated live experiment" on adolescents, with "likely permanent" impacts on cognitive function in animals.

Join our campaign for accurate medical information. The Ministry of Health describes puberty blockers as "safe and fully reversible". This description is inaccurate. Blockers disrupt the adolescent’s normal development and are a drastic intervention. Puberty blockers have never been licensed for treating gender dysphoria in NZ or any country (doctors have leeway to prescribe unlicensed drugs). Several authorities below contradict the "safe and fully reversible" statement and highlight the uncertainties and negative health impacts of puberty blockers

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Karolinska Institute (Sweden)

The Karolinska Institute has stopped giving puberty blockers to adolescents under 16. The Institute cites uncertain and extensive adverse health consequences, and the difficulties gaining informed consent.

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National Institute for Health and Care Excellence (NICE) (UK)

NICE have published a review of the evidence for puberty blockers. They report little or no change in mental health outcomes and a "very low" certainty of evidence.

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Expert Statements

Many experts believe that puberty supression could have irreversible and detrimental impacts.

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National Association of Practising Psychiatrists (NAPP) (Australia)

NAPP advise that gender dysphoria can often be a manifestation of pre-existing family, social or psychiatric conditions. Conditions should be treated first before puberty blockers are considered.

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Irish College of General Practioners (ICGP)

The ICGP have removed statements describing puberty blockers as "reversible" from their guidelines. They now emphasise psychotherapy and highlight the lack of evidence for blockers

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Royal Australia New Zealand College of Psychiatrists (RANZCP)

The RANZCP advise their members that there is a "paucity of quality evidence" on outcomes for children with gender dysphoria.

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Council for Choices in Health Care (Finland)

Finland has published advice on the medical treatment of gender dysphoric minors that contradicts New Zealand's Ministry of Health.

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Centre for Evidence-Based Medicine (Oxford University)

The CEBM reviewed the research on puberty blockers and highlights blockers as a "momentous step in the dark".

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National Health Service (UK)

The NHS has removed language indicating blockers are "fully reversible" and now states that it is "not known whether hormone blockers affect the development of the teenage brain or children's bones"

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