The Truth About Fish Oil Taste

Understanding the Unpleasant Taste of Fish Oil

It's a common query among those who take fish oil supplements: "Why does my fish oil taste metallic?" Or perhaps you've experienced the dreaded "fish burps" after taking your daily dose. These aren't just minor annoyances; they're often indicators of the quality – or lack thereof – of the fish oil you're consuming. While the idea of taking a supplement derived from the sea might conjure up images of fresh ocean breezes, the reality can sometimes be quite different, leading to a decidedly unappetising experience. This article delves into the primary reasons behind these unpleasant tastes and smells, focusing on the crucial factor of oxidation, and explains what sets high-quality fish oil apart.

What is Oxidation and Why Does it Matter?

Oxidation, in the context of oils, is a chemical reaction that occurs when the oil is exposed to oxygen. Think of it like an apple turning brown after you cut into it – that's oxidation at work. For delicate marine oils like those found in fish oil supplements, this process can degrade the beneficial omega-3 fatty acids (EPA and DHA) and produce by-products that have an unpleasant, metallic, or rancid taste and smell. The longer the oil is exposed to oxygen, heat, or light, the more likely it is to oxidise.

When manufacturers don't adhere to strict standards regarding oxidation, the resulting fish oil can quickly become rancid. This is the primary culprit behind those strong fishy tastes and the infamous fish oil burps. The body reacts to these degraded compounds, leading to the unpleasant aftertaste and regurgitation that many people try to avoid.

The Bare Biology Approach: Minimising Oxidation

Not all fish oil supplements are created equal. Brands like Bare Biology pride themselves on their rigorous processes designed to keep oxidation levels extremely low. Their approach highlights what to look for in a quality fish oil:

• Freshness from Source: The marine oil is extracted from the fish while still on the fishing boats, ideally within 24 hours of being caught. This minimises the time the oil is exposed to air and potential degradation.
• Swift Processing: The oil is then rapidly transported to a specialised facility in Norway for purification. This swift handling is crucial in preserving the oil's integrity.
• Initial Testing: The Norwegian manufacturer conducts an initial test for oxidation levels at this purification stage. This provides an early quality check.
• Careful Shipping: The purified oil is then shipped in sealed drums, further protecting it from oxygen.
• Second Oxidation Test: Upon arrival at the encapsulating or bottling facility, the oil undergoes a second oxidation test. This ensures that no significant degradation has occurred during transit.
• Controlled Handling: When the oil is mixed with other ingredients (like flavourings such as lemon oil) or decanted into bottles, it is exposed to oxygen. To mitigate this, manufacturers use practices like flushing the containers with nitrogen. Nitrogen is an inert gas that displaces oxygen, significantly reducing the potential for oxidation during the bottling process.
• Final Testing: After the oil is bottled or encapsulated, it is tested for oxidation once more.
• Independent Verification: Reputable brands often go a step further by submitting their products to independent third-party testing bodies. IFOS (International Fish Oil Standards) is a well-respected organisation that tests fish oil batches for purity, potency, and oxidation. Their results are publicly available, offering consumers transparent information about the product's quality. Unlike some other testing companies, IFOS does not have any commercial ties to the brands they test, ensuring unbiased results.

This multi-stage testing and careful handling process is what allows brands like Bare Biology to offer fish oil that, as they describe, "literally doesn't smell of anything other than the faintest hint of the sea!" This lack of strong odour is a direct indicator of low oxidation levels.

Why Do Some Fish Oils Taste Fishy?

The contrast between a neutral-smelling fish oil and one that tastes strongly of fish or metal lies almost entirely in the handling and storage processes concerning oxidation. If fish oil is:

• Not handled quickly enough after extraction: The longer it sits before processing, the more chance it has to oxidise.
• Stored in unsuitable conditions: Exposure to heat, humidity, or light can accelerate the oxidation process. Even leaving the bottle cap off for extended periods can introduce oxygen.
• Manufactured without strict quality control: Companies that don't prioritise testing and minimising oxygen exposure are more likely to produce an oxidised product.

The result is that the beneficial omega-3s have broken down, creating compounds that are responsible for the unpleasant taste and smell. These are the same compounds that cause those notorious fish oil burps, as they are released back up into the oesophagus.

What Does Fresh Fish Oil Taste Like?

Ideally, high-quality, fresh fish oil should have a very neutral taste and smell. If it has any aroma at all, it should be a very mild, slightly oceanic scent, reminiscent of the sea itself. Some manufacturers add natural flavourings, such as lemon or orange oil, to mask any hint of fishiness and improve palatability. However, even with added flavours, a truly fresh fish oil should not have a strong, lingering fishy or metallic aftertaste.

How to Stop Fish Oil Burps

If you're experiencing fish oil burps, it's likely a sign of oxidation, but there are also ways to manage the issue even with less-than-perfectly fresh oil:

• Choose High-Quality Brands: As discussed, opt for brands with transparent testing, particularly for oxidation levels (look for IFOS ratings).
• Keep it Cool: Store your fish oil in the refrigerator after opening. This slows down the oxidation process.
• Take with Food: Consuming your fish oil with a meal, especially one containing fats, can help it move through your digestive system more quickly and may reduce the likelihood of burps.
• Freeze Capsules: Some people find that freezing the capsules before taking them helps prevent burps. The cold can slow down the release of the oil in the stomach.
• Take with a Neutralising Agent: Consuming a small amount of something acidic, like a sip of lemon juice or apple cider vinegar, before or after taking your fish oil might help neutralise the stomach contents and reduce burps.
• Consider Enteric-Coated Capsules: These capsules are designed to dissolve in the small intestine rather than the stomach, which can significantly reduce the chance of burps.

Why Do Fish Oil Make You Burp?

Fish oil burps occur when the oil, particularly if it has started to oxidise, is released from the stomach back into the oesophagus. The stomach's contents are acidic, and when the oil begins to break down, it can release volatile compounds that cause the characteristic fishy or metallic taste and smell that you then burp up. The presence of these compounds is a direct result of the oil's degradation. The fresher and less oxidised the oil, the less likely you are to experience this.

Key Takeaways for Choosing and Consuming Fish Oil:

In conclusion, if your fish oil tastes metallic or unpleasantly fishy, it's a strong signal that the oil may have oxidised. By understanding the importance of freshness, swift processing, and rigorous testing, you can make informed choices to select a high-quality fish oil supplement that delivers its benefits without the unpleasant side effects. Always look for transparency in a brand's manufacturing process and consider independent testing results to ensure you're getting the best product for your health.

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