
In fact, the risk of irregular heartbeat might be increased in some people taking fish oil supplements. Eating fatty fish or taking fish oil supplements by mouth does not reduce the risk of irregular heartbeat. Irregular heartbeat (atrial fibrillation).But children who eat fish at least once weekly from the age of 1-2 years seem to have a lower risk of developing eczema. Taking fish oil supplements doesn't help treat or prevent eczema. Taking fish oil by mouth doesn't slow the progression or improve symptoms of atherosclerosis. Hardening of the arteries (atherosclerosis).Taking fish oil supplements by mouth does not reduce the risk of death or improve heart health in people with chest pain.

But taking fish oil by mouth for up to 6 years does not prevent vision loss or slow down its progression. People who eat fish more than once weekly have a reduced risk of developing age-related vision loss. An eye disease that leads to vision loss in older adults (age-related macular degeneration or AMD).However, taking fish oil does not seem to prevent RA.

Taking fish oil by IV reduces swollen and tender joints, but this can only be given by a healthcare provider. Taking fish oil by mouth, alone or together with the drug naproxen, seems to help improve symptoms of RA. Taking fish oil by mouth might reduce liver fat and improve liver health in people with NAFLD. Build up of fat in the liver in people who drink little or no alcohol (nonalcoholic fatty liver disease or NAFLD).It's not clear if it helps when taken short-term, or in low-risk patients. Taking fish oil by mouth for 2-4 years can slow the loss of kidney function in high-risk patients with IgA nephropathy. A condition that slowly leads to kidney disease (IgA nephropathy).It's not clear if it helps people with slightly high blood pressure or those who are already on blood pressure-lowering medications. Taking fish oil by mouth seems to slightly lower blood pressure in people with moderate to very high blood pressure. Taking fish oil supplements by mouth reduces triglyceride levels in people with abnormal cholesterol levels caused by HIV/ AIDS treatment. Abnormal levels of blood fats in people with HIV/AIDS.But taking fish oil supplements by mouth might reduce the risk of death or hospitalization in people that already have heart failure. It's too soon to know if taking fish oil supplements helps prevent heart failure. Eating 1-2 servings of non-fried fish per week is recommended. Consuming higher amounts of fish oil from foods has been linked with a lower risk of heart failure. Taking fish oil during pregnancy seems to reduce the risk of the child having nausea and vomiting from an infection of the intestines. Nausea and vomiting caused by an infection of the intestines.Taking fish oil, alone or with vitamin B12 or vitamin E, can improve painful periods and reduce the need for pain medications for menstrual cramps. Fish oil also seems to improve kidney function in people who recently rejected a transplanted kidney and are taking cyclosporine. Taking fish oil seems to prevent kidney damage in people taking cyclosporine. Kidney damage caused by the drug cyclosporine.Low doses of fish oil don't seem to have this effect. Taking a high dose of fish oil by mouth seems to slow weight loss in some cancer patients. Involuntary weight loss in people who are very ill (cachexia or wasting syndrome).

Taking fish oil by mouth decreases the rate of blood vessel re-blockage by up to 45% when taken for at least 3 weeks before an angioplasty and continued for one month after.
