This advice for healthcare professionals on managing malnutrition with oral nutritional supplements (ONS) has been developed by a multi-professional group. It is endorsed by the Royal College of General Practitioners, the British Association for Parenteral and Enteral Nutrition, the British Pharmaceutical Nutrition Group, the Pharmaceutical Services Negotiating Committee, the Primary Care Society for Gastroenterology, and the Royal Pharmaceutical Society. It is supported by the British Dietetic Association, the National Nurses Nutrition Group, and the Royal College of Nursing. First produced May 2013, last reviewed and updated June 2016 (to be reviewed June 2017).