No, they don't. Here's a listing of 70+ papers.
Not on trans issues. The paper is pretty TERFy on the subject.This is old, but i know you guys love the guardian.
And here's a good example of why The Guardian isn't reliable on the issue.
I'll let Brynn Tannehill lay out the problem with The Guardian article: "This statement is another gross representation of the research. The study in question was an update of a 1997 study and concluded that between 1998 and 2004, only two studies on the effectiveness of GCS had partially met the criteria of being peer-reviewed and having both a control group and a dropout rate of less than 50 percent. Of those two studies, both showed that patients benefited from the treatment. But the small sample size of the studies prohibited the update from drawing any conclusions on the effectiveness of GCS."
A far cry from the article.
She also points out: "But this does not mean there hasn’t been research: Seventy-one peer reviewed articles showing the effectiveness of transition-related medical care can be found here. And in 2014 another study, by Dr. Cecilia Dhejne, the lead author of the first Swedish study described above, addressed the dropout-rate issue in a study of all Swedish applicants for GCS between 1970 and 2010. She found a 2.2-percent regret rate for both sexes, and a significant decline in regrets over the time period."
2.2% is absurdly low, btw.