Typically, unopened fish oil bottles last between 12 to 24 months. Consuming rancid fish oil does not usually result in immediate, acute poisoning, but it can cause unpleasant digestive distress such as nausea, burping, or an upset stomach.
Fish Oil Fresh Vs Rancid: How to Spot the Difference
This date is not an arbitrary suggestion but a manufacturer's estimate of when the product will retain its full potency and safety under ideal storage conditions. However, a critical question often lingers on bathroom counters and in kitchen cabinets: does fish oil expire , and what happens if you consume it past its prime? Understanding the Expiration Timeline Every bottle of fish oil carries a specific expiration or "best by" date printed on the label.
What Happens When Fish Oil Goes Bad? Oxidation is the primary enemy of fish oil. Heat and light are the catalysts that speed up oxidation.
Telling Fresh From Rancid: Spotting Fish Oil That Has Gone Bad
If the aroma is sharp, pungent, or resembles old paint, varnish, or stale nuts, the oil has rancidified and should be discarded immediately. Once the seal is broken and the bottle is exposed to air, the countdown accelerates, and the oil begins a slow process of oxidation that degrades its quality over time.
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