*High doses of fish oil might also reduce the immune system’s activity, reducing the body’s ability to fight infection. This is a special concern for people taking medications to reduce their immune system’s activity (organ transplant patients, for example) and the elderly.
*Only take high doses of fish oil while under medical supervision.
* Recent research finds fish-based Omega-3s inhibit the action of insulin, thereby increasing blood sugar levels and aggravating diabetes. Another study shows fish-derived Omega-3s greatly increase the volume of colon cancer metastasis when compared to a low-fat diet.
*Fish oil can cause side effects including belching, bad breath, heartburn, nausea, loose stools, rash, and nosebleeds. Taking fish oil supplements with meals or freezing them can often decrease these side effects.
*Consuming large amounts of fish oil from some DIETARY sources is POSSIBLY UNSAFE. Some fish meats (especially shark, king mackerel, and farm-raised salmon) can be contaminated with mercury and other industrial and environmental chemicals, but fish oil supplements typically do not contain these contaminants.