Omega-3 are a type of essential fatty acids, which are essential for brain health and can prevent many conditions.
According to the University of Maryland Medical Centre they reduce inflammation and lower risk of chronic diseases such as heart disease, cancer, and arthritis.
Research has also found them to be helpful for memory and performance, and reducing symptoms of depression.
The body can’t make omega-3, so you have to get it through supplements or food.
Rich dietary sources include fish, particularly fatty varieties such as mackerel, salmon and sardines.
The British Dietetics Association recommends people eat two portions of fish per week for omega-3.
However there is no specific recommended dose, since they argue there is not enough evidence yet that supplements can benefit children and adults.
That said, many people still choose to take them.
A study published this week revealed that the global nutritional lipids market – of which omega-3 supplements account for the largest share – is set to double by 2022.
The Food and Drug Administration in the United States says up to 3g of omega-3 fatty acids a day is safe.
However some groups of people are advised against taking the supplements.
Those on anticoagulant drugs should avoid them since omega-3s can affect blood clotting.
According to the NHS, they are used for people who are at risk of developing blood clots that could block a blood vessel and disrupt the flow of blood around your body.
These conditions include strokes, heart attacks, deep vein thombrosis, transient ischaemic attacks and pulmonary embolism.
This is because omega-3s can stop them working – potentially allowing a blood clot to form.
The University of Maryland Medical Centre also warns against using omega-3 supplements if you’re on blood sugar-lowering medications, cholesterol-lowering medications and non-steroidal anti-inflammatory drugs.
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