Participants were randomised to one of 2 groups; apple cider vinegar supplements (400 mg tds) or placebo (dummy capsule). The study will be performed double blinded, with participants and investigators unaware of study allocation. A follow up clinic visit was made at 3 months, when weight was rerecorded, a food frequency questionnaire re-administered, pain diary entries reviewed, and a pill count performed to check compliance. All reports of gouty flare were validated against rheumatology, emergency department and primary care records.