Keira Bell, 23, who as a teen transitioned to male but came to regret it. The case set in motion a focus on puberty blockers which is now influencing other countries to radically overhaul the treatment of children with gender dysphoria…. Bell was given puberty blockers as a teenager after only three hours of consultation at the Tavistock Clinic, London, which runs England’s only National Health Service (NHS) gender identity development service (GIDS). Initially, her case won a judgement that children under the age of 16 considering gender reassignment were unlikely to be considered mature enough to give informed consent to be prescribed puberty-blocking drugs.