Most Omega-3 Fish Oil Supplements Are Rancid: Study Reveals Shocking Data

Published: Thursday, February 5, 2026

A pivotal 2023 study found that many fish oil products are rancid before consumed. A multi-year scientific analysis of 72 of the most commonly sold Omega-3 supplements found that 45% of tested fish oil supplements were rancid with some samples exhibiting levels of oxidation up to 11 times higher than recommended international voluntary standards. 

Jump to section quickly:

  • Why Does This Happen?

  • The Benefits Of Omega-3 Fish Oil

  • How A 35 Year Old Nutrition Pioneer Solved The Issue

  • The Ultimate Omega-3 Supplement

  • Final Thoughts

Omega-3 fatty acids like EPA and DHA are highly sensitive to heat, light, and oxygen. Without proper purification and protection, fish oil can oxidize during processing, shipping, or storage.

 

Independent testing has found that a significant percentage of popular omega-3 supplements can spend up to a shocking 18 months on shelves before being purchased and consumed.

 

Oxidized fish oil not only loses potency failing to deliver the benefits people expect but worst, it can have negative effects with added oxidative stress on the cells, increased inflammatory response and has even been linked to neurodegenerative diseases.

Why Does This Happen?

There are several reasons fish oil supplements often oxidize:

  • Long supply chains and poor storage: Fish oil may be processed far from where it's bottled and shipped, with exposure to heat and oxygen along the way.
  • Insufficient purification and protection: Many manufacturers don't use advanced purification methods or adequate antioxidant protection to maintain freshness.
  • Lack of strict regulatory oversight: Unlike medicines, supplements aren't regulated for potency and freshness-meaning rancid products can legally be sold without independent verification.

The Best Omega-3 Fish Oil On The Market

The Benefits Of Omega-3 Fish Oil

Omega-3 fish oil supplements, rich in EPA and DHA, are primarily taken to improve heart health by significantly lowering triglycerides, reducing blood pressure, and managing inflammation.

 

They are also essential for supporting brain function, improving mental health (depression/anxiety), reducing joint pain from arthritis, and supporting eye health.

 

Key reasons to consider taking omega-3 fish oil include:

  • Supports Heart Health

    Lowers Triglycerides, Reduces Inflammation in Blood Vessels, May Lower Blood Pressure, And Is Linked to Lower Risk of Heart Disease & Stroke.

  • Boosts Brain Function & Mood

    Supports Cognitive Development (Infants/Children), Linked to Reduced Depression & Anxiety Symptoms And Improves Memory & Focus.

  • Promotes Eye Health

    DHA: Major Structural Component of Retinas, Supports Healthy Vision, Reduced Risk of Age-Related Macular Degeneration, AndPrevents Dry Eyes.

  • Crucial For Pregnancy & Development

    Vital for Fetal Brain & Eye Growth, Supports Healthy Pregnancy Outcomes, Beneficial for Breastfeeding Mothers, And May Reduce Risk of Preterm Birth.

  • Additional Health Benefits

    Reduces Inflammation (Joint Pain/Stiffness), Promotes Healthy Skin (Hydration, Anti-aging), And May Help Manage Autoimmune Conditions.

Important Considerations:

 

Potential Side Effects: While generally safe, side effects can include fishy breath, digestive issues, or nausea.

 

Consultation Advised: While generally beneficial, some studies suggest that high-dose, over-the-counter supplements might not have the same cardiovascular protection as eating fish, and could potentially increase the risk of atrial fibrillation in some patients. It is best to discuss usage with a doctor.

How A 35 Year Old Nutrition Pioneer Solved The Issue:

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The Best Omega-3 Supplement On The Market

After uncovering how widespread oxidation and rancidity had become in conventional omega-3 supplements, Body Wise, a 35-year nutrition pioneer, set out to raise the standard with a cleaner, more reliable solution. 

 

The result is Ultra Omega, thoughtfully formulated to deliver high-potency omega-3 support while minimizing the factors that cause fish oil to degrade. 

 

Each daily serving provides 1,300 mg of total omega-3s, including 650 mg EPA and 450 mg DHA, plus plant-based omega-3s, using the ethyl ester form that has demonstrated cardiovascular benefits in scientific research. 

 

Ultra Omega is triple molecularly distilled to remove impurities and reduce oxidation risk, then protected with an antioxidant blend of vitamin E and rosemary to help keep the oil fresh significantly longer than standard fish oil supplements. 

 

Finished with a natural lemon flavor to eliminate fishy aftertaste and enhanced with vitamin D3 for immune support, Ultra Omega reflects Body Wise's long-standing commitment to purity, potency, and science-driven nutrition.

vs

Ultra Omega

Other Brands

Triple molecularly distilled

Single or basic distillation

1,3000mg ethyl ester Omega-3 fish oil

<1,000mg Omega-3 fish oil

Includes Vitamin E, Vitamin D3 & rosemary 

No added immune-support nutrients

Exclusive antioxidant blend for 300% longer freshness

Minimal or no antioxidant protection

No fishy burps or aftertaste

Fishy taste often masked with artificial flavoring

The Ultimate Omega-3 Supplement

The Best Omega-3 Supplement On The Market

High-Potency Omega-3 Support

Each daily serving provides 1,300 mg of total omega-3s, including:

  • 650 mg EPA
  • 450 mg DHA
  • 200 mg plant-based omega-3

 

Triple Molecularly Distilled for Extreme Purity

Ultra Omega is triple molecularly distilled, a rigorous purification process that removes contaminants and significantly reduces oxidation risk-producing a cleaner, more stable omega-3 supplement.

 

Clinically Studied Ethyl Ester Form

Ultra Omega uses the ethyl ester form of fish oil, which has demonstrated cardiovascular benefits in scientific research.*

 

Antioxidant Protection for Freshness

An added blend of Vitamin E and rosemary extract helps keep the oil fresh up to 300% longer than standard omega-3 supplements without antioxidant protection.*


No Fishy Aftertaste

A natural lemon flavor eliminates fishy burps and unpleasant taste-often a warning sign of oxidation.


Added Vitamin D3

Includes Vitamin D3 to support immune health.*

What People Say About Ultra Omega by Body Wise

Final Thoughts

Your omega-3 supplement should do what you expect-support your heart, brain, mood, and overall wellness. But with so many products on the market oxidized and degraded before you take them, quality matters more than ever.

 

Ultra Omega by Body Wise offers a science-driven answer: high potency, advanced purification, antioxidant protection, pleasant taste, and added vitamin D3-all delivered reliably to your door every month.

 

Give your body the omega-3 support it deserves-fresh, pure, and effective.

Ultra Omega 

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With Body Wise's monthly subscription, you can:

  • Save with exclusive auto-ship pricing
  • Get Ultra Omega delivered automatically
  • Stay consistent with your omega-3 routine
  • No reminders. No gaps. Just reliable, high-quality omega-3 support every month.

Frequently Asked Questions

What form of omega-3 does Ultra Omega use?

Ultra Omega uses the ethyl ester form of omega-3 fish oil. This form has been used in scientific studies and has demonstrated cardiovascular benefits.*

How is Ultra Omega different from other omega-3 supplements?

Ultra Omega is triple molecularly distilled to remove impurities and reduce oxidation risk. It also includes an antioxidant blend of vitamin E and rosemary to help keep the oil fresh longer, along with higher EPA and DHA levels than many standard fish oil supplements.

How much omega-3 does Ultra Omega provide?

Each daily serving delivers 1,300 mg of total omega-3s, including:

• 650 mg EPA

• 450 mg DHA

• 200 mg plant-based omega-3

Why is triple molecular distillation important?

Triple molecular distillation is an advanced purification process that removes heavy metals, environmental contaminants, and other impurities. While it adds time and cost to production, it results in a cleaner, more stable omega-3 supplement.

Is Ultra Omega safe for long-term use?

Ultra Omega is formulated for daily use. As with any supplement, consult your healthcare professional if you are pregnant, nursing, have a medical condition, or are taking medications.

Any further questions?

If you haven't found the answer to your query in the above FAQs please contact us at service@bodywise.com and we'd be happy to help!

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Triple Molecularly Distilled for purity

1,300 mg of high-grade Omega-3 fish oil

Vitamin E, Vitamin D3 & rosemary blend

Natural lemon flavor

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