To prevent grave harm to vulnerable children—and to comply with state law—Reddit should shut down this forum of more than 76,000 users.

The TransDIY “subreddit” is an online message board where members share information on illegally obtaining hormones, manipulating doctors, and concealing hormone use from their parents. The unifying belief animating Reddit’s TransDIY community is that individuals should have unrestricted access to gender-affirming hormones without medical oversight if they feel dysphoric or identify as transgender. That notion has gained traction in underground online circles.

Reddit’s TransDIY is one of many online echo chambers that understates the risks of DIY gender medicine and takes for granted the existence of benefits.