A recent report by the independent testing company, Labdoor has found that many fish oil supplements out there are actually rancid – meaning the oils have gone bad. Many supplements were found to be heavy in oxidized oils, potentially affecting their quality.

Reported by the Guardian, Labdoor tested 54 popular fish oil supplements marketed in the USA and available worldwide. About 10% had oxidized oil high enough to be considered rancid. Some even had levels 11 times higher than recommended guidelines. Dan Mark, Labdoor’s research director reported, “The fish oil supplements would start to smell and feel off.”

Fish Oil Supplements: Is There Something Fishy About Them?

What is fish oil?

Rich in omega-3 fatty acids – a polyunsaturated fat – it is essential to a healthy diet. It is thought that regularly consuming poly and monounsaturated fats over trans and saturated fats is more beneficial to our health. Some data suggests that a diet with seafood rich in these oils may be linked to a lower risk of cardiovascular diseases.

This report is not the first of many that suggest that a good portion of fish oils on the market are rancid. Some may even use flavourings to disguise any odours or tastes, also possibly hiding the level of oxidization. Other than aesthetics, there could also be negative effects on our blood cholesterol.

The supplement industry is a billion-dollar business that is hardly regulated in comparison to drugs and other pharmaceutical items. The Guardian has recently reported that, the fish oil industry also contributes to environmental issues such as overfishing.

What is fish oil good for?

Fish oils are known for their many health benefits. They are a great source of omega-3 fatty acids, which are important for heart health, cognitive function, and joint health. Fish oils can also help to reduce inflammation and promote healthy skin and hair. Additionally, they may help to improve mood and fight depression. Fish oils are a great addition to any diet, and they should be taken daily for the best results.

When choosing a fish oil supplement, it is important to select a high-quality product. Look for supplements that are certified by the IFOS (International Fish Oil Standards) or NSF International. These organizations test fish oils for purity and quality, and only products that meet the highest standards are certified.

Fish oils are a great way to improve your health, and they should be a part of every diet. They provide many health benefits, including heart health, cognitive function, joint health, reduced inflammation, healthy skin and hair, improved mood and decreased depression risk.

How much fish oil should i take daily

This depends on your individual needs and health goals. Most people benefit from taking 1-3 grams of fish oil per day. However, if you are trying to achieve a specific health goal, such as reducing inflammation or improving heart health, you may need to take more fish oil.

When to take fish oil

Fish oils are best taken when you first wake up in the morning. This is because your body has been fasting overnight, and your stomach is empty. Taking fish oils on an empty stomach will help them to be better absorbed by your body.

How to tell if the fish oil has expired?

One way to test for rancidity is to smell the food. Rancid foods will often have a sour or unpleasant smell. Another way to test for rancidity is to taste the food. Rancid foods will often have a bitter or unpleasant taste.

If you suspect that your fish oils have gone bad, it is best to discard them. Fish oils that are rancid can cause nausea and vomiting, and they may also be toxic.

Nerdout, Determining How Rancid ~ How Bad! Fish Oil or any Edible Oil.

Peroxide Value (PV) screening figures out the variety of peroxides in the lipids. Peroxides are the preliminary indicators of lipid oxidation. Peroxides will certainly remain to respond and produce second items such as aldehydes.

p-Anisidine (p-AV) screening shows the variety of aldehydes in the lipids. This examination is commonly coupled with PV, as aldehydes are the secondary indicators of oxidation. Aldehydes can produce strong objectionable flavors as well as odors at relatively low levels.

TBA Rancidity (TBAR) likewise measures aldehydes (primarily malondialdehyde) created during the oxidation of lipids. This evaluation is largely helpful for low-fat examples, as the entire example can be assessed as opposed to just the drawn out lipids.

Free Fatty Acids (FFA) testing figures out the variety of fats that have actually been freed from their triglyceride framework. Free fats can create strong flavors and also smells at reasonably reduced degrees. Free fats are hydrolytic rancidity (not oxidation) items and also can be caused by microbial activity.

Oxidative Stability Index (OSI) suggests just how resistant a sample is to oxidation. The samples are subjected to warm while air (consisting of oxygen) is streamed via it. This procedure increases the oxidation procedure creating most oils to go rancid quickly.

The samples are kept an eye on and also the moment needed for the sample to become rancid is established. Samples that call for longer times to become rancid, and a lot more stable.

Lazy get it tested at an independent testing lab like Eurofins

Delivery forms of Fish Oil

  1. Liquids – Tincture or Softgel
  2. Powders – Sachets

Furley Bioextracts has expertise and experience in the formulation of powdered fish oil.


Furley Bioextracts has been in business for 15+ years, has combined experience of 50+ years experience in manufacturing creating over 10,000+ formulations. Certifications include ISO22000, ISO13485, cGMP, HACCP and Halal

We work with small microentrepreneurs to large multinational companies to develop their products.

We are a contract manufacturer, OEM, business partner, mentorship that specializes in manufacturing food, cosmetics, traditional, capsules, medical devices and supplements. We serve clients from all around the world including Asia-Pacific, Europe, Middle East/Africa and North America regions.

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