8 Side Effects Of Taking Too Much Fish Oil

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The fish oil, rich in Omega 3, is known for its beneficial properties to the organism. Some examples of how it helps improve your health are reducing triglycerides in the blood, reducing inflammation problems, and even relieving the symptoms of rheumatoid arthritis. However, excesses are never good, and fish oil can be harmful when taken in too high a quantity.

Unless you suffer from some physical condition that requires a higher intake of Omega-3 fatty acids .The recommended daily intake of fish oil would be between 250 and 500 milligrams. There are several factors, however, that may indicate that you are taking it in excess; that are why we explain 8 possible side effects of fish oil, so you’ll be aware of when you should reduce your dose in your daily diet.

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8 side effects of taking fish oil

1.Having high sugar

This is a problem that basically affects those with type 2 diabetes. Although some research advocates that only very high doses of fish oil can increase blood sugar levels in the long term, there are studies that show, for example, that a supplementary intake of 8 grams of Omega-3 acid can increase blood sugar by 22% in these individuals in a period of only 8 weeks (Friday et al., 1989).

This happens because Omega-3 in high doses can increase glucose production ; but, in spite of this, the comparison of several studies allows to observe that doses of up to 3.7 g of the two essential components of Omega-3 (EPA and DHA) have no effect on sugar levels in type 2 diabetes (Cai, Xuefeng and Shiying, 2015).

2.Bleeding from the gums or nose

It is not advisable to take too much fish oil if you are taking anticoagulants, as this inhibits coagulation . Doing so would double the effect of medications. For example, a study of 56 people showed that a supplement of 640 milligrams of fish oil per day decreased blood clotting in healthy adults over a period of 4 weeks (McEwen, Morel-Kopp, Chen, Tofler and Ward, 2013); while in another study of adolescents, it was also observed that 72% of them suffered from the nose as a side effect of taking between 1 and 5 grams of fish oil per day (Clarke, Cullen-Dean, Regelink, Chan, and Rose, 1990).

3.Low voltage

While for those who suffer from hypertension this can be a positive effect, for those who have it low it can be a problem.

There are many studies that demonstrate the power of fish oil to lower blood pressure, and by analyzing them it is observed that this effect happens not only to hypertensive patients, but also to those with high cholesterol .Another important point is that fish oil can, as with anticoagulants, act in reaction with the medications used to lower blood pressure. Therefore, the best option is to consult a doctor before taking any Omega-3 supplement.


Diarrhea and flatulence are one of the most common side effects of excess fish oil and other types of Omega-3 supplements .In case you have problems of this type, try to take your supplements with meals or reduce the dose, to see if the effect persists.

5.Acid reflux

Due to its high content of fat (an element that normally complicates digestion), Omega-3 acid can cause stomach acidity, nausea or stomach pain, among others .Therefore, if you take these supplements, it is best to do so with meals and in a moderate dose, or divide it into small amounts taken throughout the day.


This serious problem would be related to the ability of fish oil to inhibit the coagulation of blood, which would increase the risk of spills.

The studies carried out in this regard have been done with animals, so more should be done with humans to see if the results would be the same. However, despite the evidence in these investigations, others deny the relationship between spills and fish oil.

7.Excess of vitamin A

If you take Omega-3 supplements, you should look at the amount of vitamin A they carry. In some, it is elevated, and can even be toxic, causing dizziness, nausea, joint pain or skin irritation; may even lead to affect the liver in the long term


The fish oil can affect sleep quality. Although in moderate doses it can get to improve it, in some cases its excess can interfere in the rest and cause insomnia.

It must be borne in mind, however, that the investigations carried out are only case studies, so we must work more in depth on this topic to see if there really is a relationship between the two.


Fish oil, rich in Omega-3, is a food with great properties for health. The problems that can come are given, basically, by excessive consumption, so in the case of wanting to take supplements or find any of the problems listed above the best option is to seek advice from a doctor.


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