| Asthma | Little evidence to recommend persons with asthma modify intake of omega-3 fatty acids15 |
| Cancer cachexia | Insufficient data16 |
| Claudication | Omega-3 has limited benefit in persons with intermittent claudication, but no evidence of consistent improved clinical outcomes17 |
| Coronary heart disease | No clear effect of omega-3 fatty acid consumption on cardiovascular events in persons with, or at high risk of, cardiovascular disease18 |
| Crohn disease | Insufficient data to recommend routine use of omega-3 supplements for maintenance of remission19 |
| Cystic fibrosis | Regular omega-3 supplements may provide some benefits for persons with cystic fibrosis20 |
| Dementia | May be a protective effect of omega-3 fatty acids against dementia21 |
| Diabetes (type 2) | Omega-3 supplementation lowers triglyceride and very-low-density lipoprotein levels in patients with diabetes, but may raise low-density lipoprotein levels; no effect on glycemic control or fasting insulin22 |
| Kidney transplant recipients | Insufficient evidence to recommend fish oil therapy23 |
| Schizophrenia | Inconclusive results; use of omega-3 remains experimental24 |
| Ulcerative colitis | No evidence to support omega-3 fatty acids in maintenance of remission25 |