The principal researcher Emma Copeland, said “Many products simply did not live up to their claims.”

Health Which? Asked the manufacturers to send research supporting their claims. These were assessed by a panel of experts including a professor of lung medicine, a senior lecturer in restorative dentistry , a herbalist, a homeopath and a pharmacologist.

The panel awarded each product a ’research rating’ percentage based on the quality of evidence used to up the makers claims.

The eight remedies tested with their research ratings were:-

• STOP SNORE Mouthwash Research rating:14%
• SOMNI SNORE GUARD Research rating:30%
• SNOREZEE Spray Research rating:32%
• Y-SNORE Nose Drops Research rating:33%
• SNORESTOP Tablets Research rating:34%
• SNORE NO MORE Spray Research rating:44%
• NOZOVENT Nasal dilators Research rating:67%
• BREATHE RIGHT strips Research rating:30%