https://bmcpublichealth.biomedcentral.com/articles/10.1186/s12889-015-1867-2
>Transition vastly reduces risks of suicide attempts, and the farther along in transition someone is the lower that risk gets.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3722435/
>The ability to transition, along with family and social acceptance, are the largest factors reducing suicide risk among trans people.

https://pediatrics.aappublications.org/content/early/2014/09/02/peds.2013-2958
>Young Adult Psychological Outcome After Puberty Suppression and Gender Reassignment. A clinical protocol of a multidisciplinary team with mental health professionals, physicians, and surgeons, including puberty suppression, followed by cross-sex hormones and gender reassignment surgery, provides trans youth the opportunity to develop into well-functioning young adults.
>All showed significant improvement in their psychological health, and they had notably lower rates of internalizing psychopathology than previously reported among trans children living as their natal sex.
>Well-being was similar to or better than same-age young adults from the general population.