Fish oil has been heavily researched over the last few decades.
The research has found that fish oil has several potential benefits, including reducing inflammation and lessening incidences of cardiovascular diseases, such as high blood pressure or strokes, as well as helping to alleviate anxiety.
Reduction in Blood Pressure
There are two types of blood pressure: systolic and diastolic. An average blood pressure reading is 120/80, where systolic is the first number, and diastolic is the second.
Systolic pressure estimates how much pressure is pushed through the artery walls when the heart beats.
Diastolic pressure indicates how much pressure is pushed through the artery walls while the heart is at rest.
Fish oil supplementation has been shown to help people reduce blood pressure slightly over an extended period of use.
Here is one study that showed a decrease in blood pressure: Difference with salmon, lean fish, and fish oil.
We can trust that fish oil is applicable for reducing blood pressure, to a slight degree. As blood pressure is reduced, the incidence of a heart attack or stroke is also lessened.
As we participate in exercise or sports activities, an increase in inflammation is a universal side effect that applies to everyone. As we start to age, tendinitis, arthritis, bursitis, or pain is a chronic side effect that naturally occurs.
Fish oil has been shown to reduce these possible side effects of inflammation. A daily dosage of 3-6 grams (total of EPA and DPA) for 22 weeks resulted in decreased joint tenderness and stiffness in the morning (page 130 in book below).
Reductions in Anxiety
Research has demonstrated that fish oil can assist to reduce anxiety. This study was for medical students. They did a pre and post self-report test that measured anxiety called the Beck Anxiety Inventory. A dosage of 2.5 grams of omega-3 was able to reduce anxiety by 20%.
Smith-Ryan, A. E. & Antonio, J. (2013). Sports Nutrition and Performance Enhancing Supplements. Linus Learning.