Two big reasons to rethink your fish oil supplement
Nutrition Diva
Macmillan Holdings, LLC
4.4 • 1.8K Ratings
🗓️ 30 July 2025
⏱️ 14 minutes
🧾️ Download transcript
Summary
A shockingly high percentage of fish oil supplements are actually rancid–which means they may be doing more harm than good.
Additional episodes mentioned in this episode:
Fish oil and prostate cancer risk
Is it time to stop taking fish oil?
Could fish oil actually increase your risk of cardiovascular events?
Are omega-3 eggs as good as eating fish?
Research mentioned in this episode:
https://pubmed.ncbi.nlm.nih.gov/37712532/
https://pmc.ncbi.nlm.nih.gov/articles/PMC3217043/
https://jamanetwork.com/journals/jamacardiology/fullarticle/2670752
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Transcript
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| 0:00.0 | A longtime listener wrote in after seeing a social media post warning that fish oil supplements |
| 0:06.0 | are often rancid. And understandably, that raised some concerns. And while rancid supplements |
| 0:13.8 | are a real issue, there's another larger question that I think we should also talk about. |
| 0:20.1 | Even if your fish oil is fresh, |
| 0:22.5 | is it actually doing you any good? |
| 0:28.7 | Welcome to the Nutrition Diva podcast, where we take a closer look at nutrition |
| 0:35.8 | headlines, research, and trends, so that you can make |
| 0:39.3 | more informed decisions about what you eat. I'm your host, Monica Rineagle, and today we're |
| 0:44.6 | talking about fish oil supplements, whether they are safe, and whether they are even worth |
| 0:49.4 | taking. Kat, a longtime listener, wrote in after she saw a social media post warning people not to buy |
| 0:57.8 | their fish oil supplements at certain big box stores. And the claim was that these supplements |
| 1:04.3 | are often rancid and they could even be doing more harm than good. Well, that got her wondering |
| 1:10.2 | whether she should even keep taking them, |
| 1:13.7 | especially since she knows her diet is relatively low in omega-3s, and she doesn't really like |
| 1:19.2 | cooking fish. Concerns about rancid omega-3 supplements are not new, and they're also not |
| 1:26.9 | unfounded. But there is a larger question here |
| 1:31.2 | as well. Are fish oil supplements actually doing what you hope they're doing for your health? |
| 1:38.0 | Despite decades of conventional wisdom that linked omega-3 fatty acids with heart health. More recent research suggests that the |
| 1:47.3 | benefits of supplementation may not be as clear-cut as we once believed. So let's take a look |
| 1:53.8 | first at this problem of rancidity in fish oil supplements and how you can tell if yours has gone bad, |
| 2:03.1 | and then what the latest science says about the actual benefits and potential risks of omega-3 supplementation. So we'll |
| 2:09.7 | start with Kat's original question. Are concerns about rancid fish oil supplements legitimate? |
... |
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