Taking fish oil for a healthier heart is a smart habit, until an unexpected aftertaste makes you second-guess it. Fish oil burps are one reason people quit taking their omega-3 supplement altogether, even though it's good for them. The good news is that fishy burps aren't something you have to live with. Once you understand why they happen, fixing them is usually pretty straightforward.
Why Do Fish Burps Happen?
Picture an omega-3 softgel capsule like a tiny water balloon filled with oil. It's designed to dissolve and release that oil in the small intestine, where fat digestion is supposed to happen. Instead, it often breaks down too early in the stomach.
Now, here's the part that explains the fish oil burps: oil is lighter than the watery contents of your stomach, so it floats. That floating layer drifts up toward the lower esophageal sphincter, which is the valve that keeps stomach contents from coming back up. When oil slips past it, you get a burp that tastes like the ocean.
A few actions make this more likely:
- Taking it on an empty stomach. Without food to help move things along, the oil sits longer, giving it more time to rise and escape.
- The chemical form of the oil. Omega-3s come in two main forms: the first is triglyceride (TG), which is the natural form found in fish. The second is ethyl ester (EE), a more processed form often used in cheaper, more concentrated supplements. TG form is closer to what your body already recognizes and digests more cleanly, while EE form requires an extra enzymatic step before it can be absorbed and is more likely to cause "why does fish oil make you burp?" complaints1.
- Oxidation and freshness. Fish oil degrades when exposed to heat, light, and air, undergoing a chemical breakdown that produces compounds responsible for an unpleasant odor and taste2. Oxidized oil smells and tastes considerably worse, which is part of why some fish oil brands seem fine at first but taste rancid after a few months on the shelf.
- Large doses taken all at once. Your digestive system can only emulsify so much fat at a time. Overloading it makes inefficient digestion and burping more likely.
What You Can Do About Fish Burps
To reduce the likelihood of adverse effects when taking fish oil, try the following.
Watch Your Concentration and Dosage
Take fish oil with a meal that contains some fat. Dietary fat triggers the release of bile, which breaks the oil into smaller droplets that are easier for your body to absorb. That keeps it moving through your system properly, rather than floating around undigested.
Look for Enteric Coatings
An enteric coating is a thin shell layered over the softgel. The coating resists breaking down in stomach acid. Instead, it passes through the stomach intact and dissolves in the small intestine, the actual site of fat digestion. Gastric acid-resistant coatings on fish oil capsules can reduce gastrointestinal side effects associated with early oil release while providing absorption comparable to that of standard capsules3.
Think of it as a coated aspirin, but for fish oil. It's built to survive the trip through your stomach, so that it's digested in the small intestine, preventing fishy burps.
Consider Vegan Alternatives
Algae-based omega-3 supplements are an alternative. Algae is actually the source of EPA and DHA in the food chain, since fish accumulate it by eating algae. Although a vegan supplement offers a lower dosage of omega-3 compared to non-vegan options, choosing the former is one way to avoid the marine aftertaste. This is a solid option if your stomach doesn't tolerate fish-derived oils well, regardless of coating or dosage.
Increase Dietary Sources
Eating fatty fish like salmon, sardines, and mackerel a few times a week can supplement what you're getting from a capsule, or in some cases, reduce the amount of supplemental dose you need. Food doesn't carry the same burping risk because it's broken down through normal digestion rather than floating loose in your stomach as concentrated oil.
Why OmegaVia
OmegaVia's formulas are built specifically to minimize the issues that cause fishy burps in the first place. Every capsule has an enteric coating to aid digestion. Each product uses the natural triglyceride form of omega-3, not the cheaper ethyl ester form, and every batch is purified through a low-heat process that reduces oxidation and the rancid taste that comes with it.
Ultra Concentrated Omega-3 delivers 1,135 mg of omega-3s per softgel in triglyceride form, sourced from wild sardines and anchovies and triple-purified to remove contaminants and reduce oxidation. For people who've struggled with aftertaste from other brands, the difference in oil quality alone often solves the problem.
For those who want to avoid fish oil completely, OmegaVia's Vegan Omega-3 Softgels deliver algae-based DHA with no fishy aftertaste. All OmegaVia products are third-party tested by IFOS and ConsumerLab, with every batch independently verified for purity and freshness.
Shop omega-3 supplements built to go down easily.
Frequently Asked Questions
Why does fish oil cause burps?
The softgel's shell dissolves in your stomach, releasing oil into a part of the digestive tract that's not designed to digest concentrated fat efficiently. Because oil floats, it can drift past the lower esophageal sphincter and come back up as a burp carrying the smell and taste of fish. Taking the supplement on an empty stomach, in large single doses, or in the less-absorbable ethyl ester form all make this more likely.
Do fishy burps mean the supplement is rancid?
Not always. A mild fish taste from early oil release in the stomach is normal for many people. However, a sharp, sour, or paint-like smell can indicate the oil has oxidized and gone rancid. Fresh and high-quality fish oil typically has a milder smell and taste, even when burping occurs.
What is the best burp-free fish oil supplement?
Look for triglyceride-form omega-3 rather than ethyl ester, a low-heat purification process, third-party testing for freshness, and an enteric coating.
OmegaVia omega-3 softgel capsules tick these boxes. Unlike many standard omega-3 softgel capsules, OmegaVia supplements have an enteric coating, ensuring they withstand the stomach's acidity and reach their destination, the small intestine, for a truly burp-free experience. Algae-based vegan omega-3, like Vegan Omega-3 Softgels, is also a strong option since there's no fish oil involved.
Does freezing fish oil help with burps?
OmegaVia does not recommend refrigerating or freezing supplements to reduce burping or aftertaste. While some sources suggest chilling capsules slows their breakdown in the stomach, condensation from temperature changes can compromise the integrity of the softgel and the oil inside. Proper storage at room temperature, away from heat and light, better protects both freshness and effectiveness.
Why do I get vitamin burps from supplements?
Vitamin burps happen for similar reasons as fish oil burps: a capsule breaks down in the stomach before food can help move it along, and gas or a lingering taste comes back up as a burp. This is common with fat-soluble vitamins and oil-based supplements generally, not just fish oil. To reduce the burp risk, take supplements with a meal, split larger doses, and choose enteric-coated or higher-quality formulations.
Sources
- Offman, E., Marenco, T., et al. (1 October 2013). Steady-state bioavailability of prescription omega-3 on a low-fat diet is significantly improved with a free fatty acid formulation compared with an ethyl ester formulation: the ECLIPSE II study. Vascular Health and Risk Management. Retrieved June 19, 2026, from https://pmc.ncbi.nlm.nih.gov/articles/PMC3794864/
- Jairoun, A. A., Shahwan, M., et al. (31 December 2020). Fish oil supplements, oxidative status, and compliance behaviour: Regulatory challenges and opportunities. PLoS One. Retrieved June 19, 2026, from https://pmc.ncbi.nlm.nih.gov/articles/PMC7774961/
- Schneider, I., Schuchardt, J. P., et al. (29 March 2011). Effect of gastric acid resistant coating of fish oil capsules on intestinal uptake of eicosapentaenoic acid and docosahexaenoic acid. Journal of Functional Foods. Retrieved June 19, 2026, from https://www.sciencedirect.com/science/article/abs/pii/S1756464611000132
