Meghan Markle sends 'clear message' with visibility of stress patch in new picture

While Prince Harry is away in Asia, Meghan was seen a £1,200 Max Mara wool coat despite temperatures hitting 73F (22.7C).

But royal fans noticed her left cuff was turned up and a mysterious blue sticker on her arm.

The patch was later confirmed as a NuCalm Biosignal Processing Disc, by the company itself.

On its official Instagram page, the business shared pictures of Meghan wearing the patch.

Offering a free trial, a discount code and promoting an app costing up to $49-a-month, NuCalm captioned the photo: "The Duchess wore a disc, which activates the parasympathetic nervous system."

Expert Ede said the outing is another sign that her lifestyle blog The Tig may soon return.

"Meghan's strategic placement of a stress pack from a relatively new start-up company who reposted the image of her in their own social media is a clear message that she is looking to build her lifestyle brand and create a platform for her followers to benefit from her experiences and the products that help her," he told the Daily Mail.

"The image was a clear message to say she's stressed but she's using a patch to help her. Her brand is very strong so I think that this is a good way to go, with partnerships."

According to brand the circular patch is meant to reduce stress hormones and improve sleep.

Each daily "biosignal processing disc" by NuCalm costs £3.15 which, if worn every day, would cost around £1,150 a year.

Guy Leschziner, Professor of Neurology and Sleep Medicine at King's College London, said: "It doesn't look like they've actually proven anything. They may well prove us all wrong, but the burden of proof is on them."

The patches send a signal to the heart, slowing down cellular actions to mimic the “body’s normal transition to a peaceful, restorative night’s sleep”.

Users of the patch are instructed to wear only on their left wrist and to place it three-finger lengths away from the wrist.