The simplest answer to how to avoid fish oil burps: take your softgels with a meal rather than on an empty stomach, and if that is not enough, try swallowing them frozen or splitting the dose between two meals. If the burps taste rancid rather than simply fishy, the oil itself may be the problem, and a fresher bottle is the fix. Those habits cover most cases, and they work with any fish oil, including MAXIS Ultra Omega-3.
Key takeaways
- A fishy aftertaste is one of the most common, and usually mild, side effects of omega-3 supplements.
- Taking fish oil at the start of a meal is the simplest fix. Food keeps the oil mixed in the stomach and also helps absorption.
- Frozen softgels break down more slowly in the stomach, which can reduce burps without making the oil less effective.
- Splitting a two-softgel serving across two meals gives the stomach less oil to handle at once.
- A capsule that smells sharply rancid when cut open is a sign of oxidation. Replace the bottle and store the next one away from heat and light.
Why does fish oil make you burp?
A fish oil softgel opens in the stomach and releases its oil there. When you burp, some of that fish-scented oil comes back up with the air, and you get the familiar fishy aftertaste. It tends to be more noticeable when the stomach is empty, because there is no food to mix with the oil and buffer its odor, a point Mayo Clinic makes in its guidance on fishy burps.
How common is it? The NIH Office of Dietary Supplements describes the usual side effects of omega-3 supplements as mild and lists an unpleasant taste, bad breath, heartburn, nausea, stomach discomfort, diarrhea, headache and odoriferous sweat.
A 2023 meta-analysis pooled 90 randomized controlled trials with about 118,000 participants to compare omega-3 supplements with placebo. People taking omega-3s had roughly 3.5 times the odds of reporting a taste disturbance (dysgeusia) across 19 studies that tracked it, and somewhat higher odds of diarrhea. Burping (eructation) was also reported more often with omega-3s, but that difference was not statistically significant. In other words, the aftertaste is real and fairly common, and it is mostly a nuisance rather than a safety signal.
How to avoid fish oil burps: five habits that help
These come from guidance published by Mayo Clinic and the Arthritis Foundation, and they are easy to try one at a time.
| Habit | Why it helps |
|---|---|
| Take it at the start of a meal | Food holds the oil in the stomach and mixes with it, which buffers the odor. |
| Swallow the softgel frozen | A frozen capsule breaks down more slowly in the stomach. Mayo Clinic notes the oil is still digested effectively. |
| Split the serving | One softgel at breakfast and one at dinner gives the stomach less oil to process at once. |
| Check freshness | Oil that has oxidized smells and tastes rancid. Cut a capsule open if in doubt. |
| Consider the format | Enteric-coated capsules are designed to pass the stomach and dissolve in the intestine. Algal oil is an option for people who prefer to skip fish entirely. |
1. Take it with food, ideally at the start of a meal. This is the single easiest change. Mayo Clinic suggests taking the capsule at the beginning of a meal so the food traps the oil in the stomach. It also helps absorption: in a 1988 study, absorption of EPA from fish oil triglycerides rose from 69% to 90% when it was taken with a high-fat meal, and absorption of the ethyl ester form depended heavily on how much fat was eaten with it.
2. Freeze your softgels. Keep a week's worth in the freezer and swallow them straight from it. Both Mayo Clinic and the Arthritis Foundation describe freezing as a way to slow the capsule's breakdown in the stomach and reduce the aftertaste.
3. Divide the dose. If your serving is two softgels, take one with breakfast and one with dinner. The Arthritis Foundation recommends divided doses with meals so the stomach has less to process at one time. Your daily EPA and DHA stay the same.
4. Check that the oil is fresh. Fish oil can oxidize over time, and oxidized oil tastes and smells rancid. The Arthritis Foundation suggests breaking open a capsule: if it smells like old fish, it may be rancid, even before the printed date. Store fish oil in a cool, dry, dark place, and close the lid tightly.
5. Consider a different format. Enteric-coated softgels are built to dissolve past the stomach, and Mayo Clinic lists them among its suggestions. Algal oil supplies EPA and DHA without fish.
When fishy burps mean something else
Most fish oil burps are a harmless quirk. A few situations are worth a closer look:
- The taste is sharp, sour or "off." Rancid oil smells different from fresh fish. Replace the bottle rather than pushing through.
- You have frequent heartburn or stomach upset. These are listed side effects of omega-3 supplements. If they persist with food and a split dose, stop and talk to a healthcare professional.
- You take a blood thinner. Fish oil might prolong clotting time in people taking warfarin, although most research at 3 to 6 g of fish oil per day has not found a significant effect. Ask your doctor before starting.
- You have a fish allergy, a heart rhythm condition, or you are pregnant or nursing. Check with a healthcare professional first.
For context on dose, the FDA has concluded that supplements providing no more than 5 g of EPA and DHA a day are safe when used as recommended. Our guide to EPA vs. DHA covers how much omega-3 adults need and how triglyceride and ethyl ester forms compare.
The research described in this article concerns fish oil and omega-3s as ingredients, not the finished MAXIS product.
Where MAXIS Ultra Omega-3 fits
MAXIS Ultra Omega-3 is a concentrated fish oil from wild-caught anchovy, sardine and mackerel, molecularly distilled and kept in its natural triglyceride form. Each two-softgel serving provides:
- Fish oil concentrate: 1,330 mg
- Omega-3 fatty acids: 1,020 mg
- EPA: 660 mg
- DHA: 310 mg (970 mg EPA and DHA combined)
The softgels are mini-sized, and the label directs adults to take two daily with food, which is also the first step for avoiding fishy aftertaste. Each bottle holds 120 softgels, or 60 servings. Other ingredients are the softgel (bovine gelatin, glycerin, purified water) and mixed natural tocopherols, a natural form of vitamin E that protects the oil from oxidation. It contains fish and is not vegetarian. EPA and DHA support heart, brain and eye health.†
Ultra Omega-3 is part of the Daily Foundations collection, alongside vitamin D3 + K2 and magnesium glycinate. For more on the other two, see Vitamin D3 and K2 (MK-7) and Magnesium Glycinate vs. Citrate vs. Oxide.
FAQ
Why does fish oil make me burp?
The softgel releases its oil in the stomach, and when you burp, some of that oil's aroma comes back up. It is more noticeable on an empty stomach. Taking fish oil at the start of a meal is the simplest fix.
Does freezing fish oil capsules work?
Many people find it helps. Mayo Clinic notes that a frozen capsule breaks down more slowly in the stomach, which often reduces fishy burps, and that the oil is still digested effectively.
Do fishy burps mean my fish oil has gone bad?
Not necessarily. A mild fishy aftertaste is common even with fresh oil. A sharp, sour or rancid smell when you cut a capsule open is the warning sign, and in that case it is time for a new bottle.
Is it better to take fish oil in the morning or at night?
Either works. What matters more is taking it with a meal, every day. If burps bother you, split the serving between two meals or take it with your largest meal.
References
- Office of Dietary Supplements, National Institutes of Health (accessed 2026). Omega-3 Fatty Acids: Fact Sheet for Health Professionals. NIH ODS. ods.od.nih.gov.
- Chang JP-C, Tseng P-T, Zeng B-S, Chang C-H, Su H, Chou P-H, Su K-P (2023). Safety of Supplementation of Omega-3 Polyunsaturated Fatty Acids: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Advances in Nutrition 14:1326–1336. doi.org.
- Lawson LD, Hughes BG (1988). Absorption of eicosapentaenoic acid and docosahexaenoic acid from fish oil triacylglycerols or fish oil ethyl esters co-ingested with a high-fat meal. Biochemical and Biophysical Research Communications. PubMed.
- Mayo Clinic Health Letter (2009). Do fish oil supplements just seem too … well … fishy? Distributed via Newswise. newswise.com.
- Arthritis Foundation (2023). Stop the Fish Oil Aftertaste. arthritis.org.
†These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
This article is for information only and isn’t medical advice. Talk to your doctor before starting a supplement, especially if you take medication or have a health condition.
Written by
MAXIS Team
