Better quality fish oils should come with an expiry date on the bottle label. Without an expiry date, there is no way to know how long the fish oil is good for; there is also the chance of ingesting rancid fish oils. There is even more of a risk when using fish oil capsules since you cannot taste or smell rancid fish oil that's encapsulated.
Most fish oil manufacturers will add vitamin E to the oil to help prevent oxidation of the fatty acids.
To avoid rancid fish oils try using liquid fish oils that come fortified with vitamin E for anti-oxidant protection. You can look on the ingredient label to determine if vitamin E or other anti-oxidants have been added.
If you're using fish oil capsules, break open the capsule; it should have a mild fishy taste but still taste fresh. If the oil tastes bad, then it's most likely gone rancid; throw the entire bottle away.
Try to avoid buying cheap fish oils. They may seem like a bargain but you may be ingesting a rancid fish oil with hasn't been properly purified or enhanced with vitamin E and other anti-oxidants.
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