Fish oil comes from fish. A main concern that most people have is the quality of the fish obtained to make the fish oil capsules. There have been reports that low or poor quality supplements may have been contaminated by mercury. While this would be an extremely rare fish oil side effect, it can be a serious one at the very least.

One of the most common side effects of fish oil is diarrhea. This can usually be prevented by taking your capsules with a meal; although it may still occur even after attempts to take your pill(s) with a food. Others report that fish oil supplement side effects usually include a fishy taste in the mouth, soon after taking the pill, and sometimes lasting for hours. Be sure before taking that there are no allergies to fish oil, or any of the fish that are used to make the supplement. Read the label and inserts on the packaging to be sure you are not allergic to any ingredients found in your capsules.

Once someone has discovered how great fish oil makes them feel, they may be tempted to increase the dosage because if a little makes them feel good, then a lot should make them feel fantastic! Wrong! Never is it a good idea to take more than the recommended dosage of any medication. Too much can add other, more serious, levels of fish oil side effects.

What are the more serious side effects of using fish oil?  Since it is a natural blood thinner, taking to much can cause your blood to be entirely to thin, therefore, it will not be able to clot, which can be very serious or even fatal in certain conditions. If you are in fact allergic to certain fish used and did not know prior to taking, this can also be very serious. Be sure to know your allergies before taking any vitamins such as this.

All of the more serious complications can be avoided by being sure you never increase your dosage more than is recommended. This step alone can drastically lessen any chances for having any serious side effects from fish oil.