"Exciting" new research suggests a supplement could potentially lower the risk of Alzheimer's disease. The study found that this naturally occurring amino acid can prevent the accumulation of harmful plaque in the brain. Alzheimer's disease is the most prevalent type of dementia , causing issues with memory, language, and behaviour. It is believed to be triggered by an abnormal build-up of proteins in and around brain cells . Amyloid is one such protein, which can form plaques around brain