MEGHAN Markle, Prince Harry, Kate Middleton and Prince William have joined forces for the NHS Every Mind Matters campaign.
But what is the initiative, how are the Royals involved and what is the quiz?
What is the Every Mind Matters advert?
Meghan Markle, Kate Middleton, Prince Harry and Prince William joined forces for the NHS campaign Every Mind Matters.
Brits first saw the three-minute video - in which the four royals act as narrators and tell viewers how to beat bad sleep, stress and low mood - on Monday, October 7, when it was broadcast at 8.45pm on ITV, Channel 4, Five and Sky.
Each recorded their voice-overs on different days due to diary clashes, according to sources.
It also features stars including Davina McCall, Katie Piper, Joe Sugg, Freddie Flintoff, Glenn Close, Gillian Anderson, Professor Green and Nadiya Hussain.
In the advert, William, 37, begins by saying: "Everyone knows that feeling, when life gets on top of us.
"All over the country, millions of us face challenges to our mental health at all ages, at all intensities, and for all sorts of reasons."
Harry, 35, then takes over before Meghan, 38, and Kate, 37, say lines.
Is there a quiz?
that offers tips on dealing with stress and depression.
The website also points users to existing apps which can help them keep track of good habits to protect their wellbeing.
Meghan's voice over says: "There are things we can do. From today, there's a new way to help turn things around. Every Mind Matters will show you simple ways to look after your mental health."
Kate continues: "It'll get you started with a free online plan designed to help you deal with stress, boost your mood, improve your sleep and feel more in control."
The free online quiz offers users a personalised "mind plan" giving them advice on dealing with their mental health.
EVERY MIND MATTERS NEWS
What is the Every Mind Matters campaign?
The campaign is an initiative by Public Health England and the NHS to help raise awareness of the early symptoms of mental health issues.
Additional content will be added to the platform later.
Health secretary Matt Hancock said: "It draws together the importance of treating our mental health on an equal basis to our physical health, and treating it both as an asset that each individual needs to invest in, supported by the NHS and by the government, as opposed to just something that just needs to be fixed when it goes wrong."
- IF you are having suicidal thoughts, suffering from anxiety or depression or just want to talk, call The Samaritans on 116 123.