Identifying Expired or Rancid Supplements Changes in Sensory Properties Before swallowing a pill, it is wise to inspect it using your senses. The "Best By" or "Manufactured On" date indicates the period during which the product retains its labeled potency.
How Light and Air Exposure in the Container Affects Fish Oil Freshness
The "Expires On" date is the final safety threshold, after which the manufacturer can no longer guarantee the safety or efficacy of the ingredients. The molecular form of the oil—whether it is ethyl ester or triglyceride—can also influence its stability, with triglyceride forms generally being more resistant to rancidity.
Prolonging the Potency of Your Supply. If you detect a strong, harsh, or fishy smell, it is a clear indicator that the oil has oxidized.
How Light and Air Exposure in the Container Affects Freshness
Additionally, the frequency of opening the bottle introduces oxygen into the container, which accelerates the oxidation process. While oxidation is a natural process that happens over time, it is significantly accelerated by poor storage conditions, leading to rancidity that diminishes the potency of the supplement.
More About Can fish oil pills go bad
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