EPO and rheumatoid arthritis: 60 patients with RA were divided into 3 groups for 12 weeks; Group receiving fish oil: FO providing 1.5 g DHA/d, 1.0 g EPA/d, and 500 mg/d of other n-3 PUFAs Group receiving fish oil + evening primrose oil: EPO providing 2.6 g EPA/d, 1.9 g LA/d, and 2.3 g GLA/d Group receiving no supplementation.