First and foremost, the CALM website has lots of information. We've have picked out some links that may help.
A more in-depth look at what to look out for and steps to take to help a friend you're worried about, click here
If you'd like to help or support CALM you can join them here
If you or your friend are in need of immediate help, CALM's helpline and webchat are open 5pm to midnight every day - 0800 58 58 58 and via the website.
Need support? Worried about someone? CALM's free, anonymous and confidential helpline and webchat are open every day, 5pm-midnight. Get in touch.
You can also get in touch with the following helplines if you're in need of help:
116 123 (24 hours) Samaritans.org
A sanctuary for the suicidal 020 7263 7070 Maytree.org
0300 123 3393 (Mon - Fri 9am - 6pm) Mind.org
Prevention of Young Suicide 0800 068 41 41 (Mon - Fri 10am - 5pm / 7pm - 10pm. Weekends 2pm - 5pm) Papyrus.org