https://www.sciencedirect.com/science/article/abs/pii/S174360951534443X
Psychological support and puberty suppression were both associated with an improved global psychosocial functioning in GD adolescents. Both these interventions may be considered effective in the clinical management of psychosocial functioning difficulties in GD adolescents.
This study is from the United Kingdom. They followed 101 adolescents who received pubertal suppression at the beginning of the study and 100 adolescents who, for a range of reasons, were deemed by the team not ready to start pubertal suppression and thus did not receive it over the course of the study. Both groups received supportive psychotherapy. Both groups saw improvement in mental health (As explained by Psychology Today
https://psycnet.apa.org/record/2019-52280-009
This study suggests that gender-affirming hormones are a helpful medical intervention for transgender youth. Gender-affirming hormones were found to be associated with decreases in suicidality and improvements in general well-being. This study is especially timely given recent introduction of anti-transgender legislation.
A significant improvement (P<.05) was found between T0 and T1 in the transgender group in terms of emotional symptoms, behaviour problems, hyperactivity symptoms, pro-social conduct, as well as in the degree of anxiety and depression measured by the SDQ-Cas test, the STAI and the BDI-II scale. There were significant differences in these scales between the transgender group and the controls at T0, however, the scores equalised at T1. The families in this sample of transgender patients provided a very favourable environment according to the scores obtained on the family APGAR scale.
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I am not going to waffle on and on about this. The science is fully there that has evaluated the trans cause and it appears legitimate. The studies (psychiatrists and doctors and in particular that last Spanish study) detail a lower rate of poor mental health with those who can start transitioning to the chosen sex that they desire. Cis teens who related to their biological sex were shown to be happier in comparison to teens who were trans and not taking gender affirming hormones. I am reminded that a lot of the psuedo science that TERFs and others publish is akin to the science that was out with Social Darwinism. Social Darwinism seemed superfically to appear to be a legitimiate science in proving black people were inferior to white people though this was proven later to be total bullshit. Anthropologists have studied the phenomena too over the last century of third genders in cultures most notanly India and the Polynesian cultures (References - https://en.wikipedia.org/wiki/Fa%27afafine & https://www.thethinkingrepublic.com/being-counted/at-the-intersections-of-caste-and-gender )