From ear and neck massages to humming and submerging your face in cold water, TikTok influencers have been touting ways to stimulate the vagus nerve to reduce anxiety and promote mental well-being, amongst other benefits. Just how true is this?

Being the longest cranial nerve in the body, the vagus nerve transmits information between our brain and internal organs and is responsible for regulating our body's digestion, heart rate and immune system. It runs from the brain stem through both sides of the neck, into the torso, before branching to the internal organs. It is also a vital part of our parasympathetic nervous system which relaxes the body after periods of stress.

Science shows that stimulating the vagus nerves using electric pulses, known as vagus nerve stimulation, can improve mood and is approved by the FDA as a treatment for patients with epilepsy, severe depression and stroke. Newer research also shows positive effects on post-traumatic stress disorder, diabetes and inflammatory autoimmune conditions.  

Can the same effects be achieved using stimulation methods promoted by wellness gurus? Unfortunately, there is no scientific evidence to prove so. If they help with mental well-being, it is most likely because of a simple concept - relaxation. The best way to reduce stress, doctors say, is to practise mindfulness, paced breathing and exercise regularly.