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Why Some People Get Fish Burps From Fish Oil Supplements + What To Do

Josey Murray
mbg Contributing Writer
By Josey Murray
mbg Contributing Writer
Josey Murray is a freelance writer focused on inclusive wellness, joyful movement, mental health, and the like.
Ashley Jordan Ferira, Ph.D., RDN
Expert review by
Ashley Jordan Ferira, Ph.D., RDN
mbg Vice President of Scientific Affairs
Ashley Jordan Ferira, Ph.D., RDN is Vice President of Scientific Affairs at mindbodygreen. She received her bachelor's degree in Biological Basis of Behavior from the University of Pennsylvania and Ph.D. in Foods and Nutrition from the University of Georgia.
Image by GUILLE FAINGOLD / Stocksy
Last updated on May 16, 2022

Whether you've taken a fish oil supplement or not, chances are you've at least heard about one famously unpleasant potential side effect: the fish burp.

Considering the omega-3s (specifically EPA and DHA) found in fish oil are important for everything from your cognitive function and heart health to your vision and mental well-being,* foul-smelling belches probably shouldn't be enough to dissuade you from adding a supplement to your daily routine. But, of course, no one wants to worry about stinky burps.

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Unfortunately, this foul-smelling side effect is a pretty common one, according to mbg's vice president of scientific affairs Ashley Jordan Ferira, Ph.D., RDN. In fact, it's a top complaint associated with fish oil supplements. (Queasiness and GI upset are also common—especially among pregnant individuals.)

Fortunately, there are a few ways you can combat those fishy burps so that you can take your fish oil supplement without fear. 

Why some people get fish burps from fish oil supplements

Fun (or not-so-fun) fact: Some people are more prone to fish burps simply based on their physiology, says Ferira. You see, it's all about how quickly your stomach empties into your small intestine, a process called gastric emptying, which can vary from person to person. The slower gastric emptying happens for you, the more likely you are to find yourself belching up fishy flavor while your supplement hangs out in your stomach.

That said, a few factors can make fish burps an issue even for those who don't typically deal with them. Eating a big meal, not chewing your food enough, being dehydrated, or sipping on carbonated drinks or alcohol can all slow gastric emptying, upping your chances of belching up the scents of the sea.

In many cases, people experience fish burps anywhere from 10 minutes to hours after they take their fish oil supplement, Ferira says. The problem is so bothersome that up to 18% of people report stopping their supplements because of it.

Interestingly, fish burps can also indicate that a fish oil supplement isn't of the highest quality or hasn't been cared for correctly, resulting in oxidation (aka spoiling), according to Ferira. She puts it this way: "Oxidation of fish oil is the crux of unpleasant fish burp."

"If the oil is lower quality and does not boast low oxidation parameters (like low rancidity, spoilage, and contaminants) via state-of-the-art processing, built-in antioxidants (like rosemary and/or tocopherols, aka vitamin E), and careful handling and storage, then any burp-back reflects a lack of freshness and purity," Ferira explains.   

She goes on to say, "of course, if burps in general and backward motion (from your stomach up your esophagus) phenomena are super common for you, please see a doctor."

Summary

Some people are more prone to fish burps simply based on their physiology. Other factors, such as eating a large meal, not chewing your food enough, and dehydration, can also cause fishy burps.
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What you can do about fish burps

One important way to prevent fish burps from cropping up altogether is to select a quality fish oil supplement. Ferira specifically recommends looking for a fish oil product that focuses on preventing oxidation through careful processing of the oil during manufacturing (transparency about their sourcing and manufacturing procedures is always a good sign here) and includes antioxidants like rosemary in the formula.

Some brands opt to utilize chemical compounds to create a special coating on the supplement (called an enteric coating) that delays the release of the supplements' contents until it reaches the small intestine.

This way, once the fish oil is released, it's too far into your system to create a fishy burp. It should be noted, though, that while enteric coatings are safe, they do add quite a few extra ingredients to a product, Ferira notes. 

Other brands opt to incorporate natural botanical oils like lemon or lime oil to their formulations to mask the burps or stop them in their tracks.* 

"In addition to extremely fresh and pure fish oil from wild-caught, cold-water South Pacific anchovies from off the coast of Chile, mindbodygreen's omega-3 potency+ incorporates organic lemon oil and the herb rosemary to thoughtfully counteract fish burps and enhance the fish oil's antioxidant capacity and freshness respectively,"* Ferira explains. It's a winning combo for a top-quality (and belch-free) supplementing experience. 

That said, avoiding fish burps doesn't stop at checkout. Caring for your fish oil supplement is also important in keeping the burps at bay. Ferira recommends storing it away from heat and light and tightening the cap completely after each use to limit oxygen exposure.

Of course, being mindful of when and how you take your fish oil is also important. If fish burps are a problem for you, avoid popping your supplement alongside a big meal, alcohol, or your favorite carbonated beverage (all of which, slow gastric motility and increase the chances of burping).

Summary

A quality fish oil supplement that includes antioxidants is one way to prevent fish burps. Make sure to store it away from heat and light and tighten the cap completely after each use to limit oxygen exposure.
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The takeaway

Some people are naturally more prone to fish burps than others—and a few different factors can affect whether you find yourself belching up unsavory flavor after taking your fish oil supplement.

For best results, select a high-quality fish oil that is infused with a botanical oil (like citrus) and minimizes oxidation of the oil from start to finish.

From there, storing your supplement properly and ensuring you don't take it with heavy meals or certain drinks can make your overall digestion speed and fish oil experience a more positive one.

This way, you can focus on all the benefits your body is reaping from those good-for-you omega-3s,* instead of sweating whether your supplement routine will sabotage your social life.

If you are pregnant, breastfeeding, or taking medications, consult with your doctor before starting a supplement routine. It is always optimal to consult with a health care provider when considering what supplements are right for you.
Josey Murray
Josey Murray
mbg Contributing Writer

Josey Murray is a freelance writer focused on inclusive wellness, joyful movement, mental health, and the like. A graduate of Wellesley College, where she studied English and Creative Writing, her work appears in Women’s Health, Cook & Culture, and more. By expressing her own vulnerability, she writes with warmth and empathy to help readers find self-compassion and true wellness that’s sustainable for body, mind, and planet.