There is significant proof of benefits:

Positive outcomes were decreased suicidality in adulthood, improved affect and psychological functioning, and improved social life. Adverse factors associated with use were changes in body composition, slow growth, decreased height velocity, decreased bone turnover, cost of drugs, and lack of insurance coverage.

https://doi.org/10.1111/camh.12437

I can’t vouch for the quality of this literature review (because I don’t want to take an hour or more to read a paper for a Lemmy comment), but usually literature reviews show a fuller picture than individual studies.

Also, this sentence is in the conclusion:

Although large long-term studies with diverse and multicultural populations have not been done, the evidence to date supports the finding of few serious adverse outcomes and several potential positive outcomes.