The Herald has sought comment from Gloriavale leaders.
A source close to the religious sect said the incident was shocking and extremely sad.
"I heard that he tried to kill himself," he said.
"There is no suicide at Gloriavale, I'm pretty sure it hasn't happened before.
"It's taught against - the belief is right against suicide, so to be able to do something like that you would have to be pretty depressed."
The source called on authorities to investigate the leadership at Gloriavale to prevent further young people harming themselves, or worse.
He claimed the environment young people were growing up in at the commune was "controlling" and there was constant "pressure put on them to conform".
He claimed to be aware of a number of young adults at Gloriavale who struggled mentally and emotionally and claimed the leaders did little to support them or address mental health issues.
"The environment that the leaders make there is controlled.
"If this was an attempted suicide - what are the reasons for it?
In June 2015, 14-year-old Prayer Ready died at Gloriavale after choking on a piece of meat while shut in an isolation room.
The teen, who had Down Syndrome, was in a room where the door handles had been disabled to prevent people getting in and out.
Her death was investigated by the Coroner, who heard Prayer was in the room with her parents and siblings.
The family had been put in there to stop infection spreading after an infant had been hospitalised with what Gloriavale described as an "infectious and dangerous disease".
WHERE TO GET HELP:
If you are worried about your or someone else's mental health, the best place to get help is your GP or local mental health provider. However, if you or someone else is in danger or endangering others, call police immediately on 111.
OR IF YOU NEED TO TALK TO SOMEONE ELSE:
• LIFELINE: 0800 543 354 or 09 5222 999 within Auckland (available 24/7) • SUICIDE CRISIS HELPLINE: 0508 828 865 (0508 TAUTOKO) (available 24/7) • YOUTHLINE: 0800 376 633 ,free text 234 or email talk@youthline.co.nz or online chat. • NEED TO TALK? Free call or text 1737 (available 24/7) • KIDSLINE: 0800 543 754 (available 24/7) • WHATSUP: 0800 942 8787 (1pm to 11pm) • DEPRESSION HELPLINE: 0800 111 757 • SAMARITANS – 0800 726 666.