Related Experiment Video
Updated: Jul 16, 2025
08:54
NMR Spectroscopy as a Robust Tool for the Rapid Evaluation of the Lipid Profile of Fish Oil Supplements
Published on: May 1, 2017
26.2K
A Multi-Year Rancidity Analysis of 72 Marine and Microalgal Oil Omega-3 Supplements
Jacob M Hands1, Mark L Anderson2, Tod Cooperman2
1The George Washington University School of Medicine & Health Sciences, Washington, District of Columbia, USA.
Journal of Dietary Supplements
|September 15, 2023
Summary
Flavored omega-3 (Ω3) supplements are significantly more likely to be oxidized and rancid than unflavored versions. This study analyzed 72 consumer Ω3 products, finding most flavored options exceeded safety limits for oxidation.
Area of Science:
- Nutritional Biochemistry
- Food Science
- Consumer Product Analysis
Background:
- Consumer omega-3 (Ω3) supplements exhibit considerable variability in freshness, with concerns regarding oxidation (rancidity).
- Previous research on Ω3 supplement oxidation has yielded conflicting results, necessitating further investigation.
- Oxidation of Ω3 fatty acids can impact product quality and potentially human health.
Purpose of the Study:
- To assess the oxidative status of consumer marine- and plant-derived omega-3 (Ω3) supplements.
- To investigate the impact of flavoring on the oxidation levels of Ω3 supplements.
- To compare oxidative markers against established quality standards.
Main Methods:
- Analysis of peroxide value (PV), para-anisidine value (p-AV), and total oxidation (TOTOX) for 72 Ω3 supplements (2014-2020).
- Utilized an adjusted fixed effects model to evaluate the effect of flavoring.
- Controlled for delivery system, source (algae, calamari, fish, krill, mussels), and third-party certifications.
Main Results:
- A significant majority of flavored Ω3 supplements (68%) exceeded the GOED TOTOX upper limit (≤26), compared to unflavored (13%).
- Flavored supplements were more likely to fail PV (65% vs. 32%) and p-AV (62% vs. 26%) limits.
- Oxidation levels varied significantly based on flavoring, delivery system, and source.
Conclusions:
- Flavoring is a significant factor contributing to the increased oxidation of consumer omega-3 supplements.
- A substantial proportion of consumer Ω3 supplements, particularly flavored ones, may be oxidized beyond recommended safety thresholds.
- Findings highlight the need for improved manufacturing and quality control practices to ensure the stability and safety of Ω3 supplements.
