What is the shelf life of olive oil (unopened and opened containers)? Is there anything that can be done to extend the shelf life...I was told that ascorbic acid granules could be added to extend shelf life?
Researchers have shown that oil stored in polyethelene bottles exposed to light can develop unacceptable limits of peroxide in as little as 20 days while if stored in dark it can last 120-190 days. Oil stored in tin in a cool environment should last 1-2 years. Opened oil with headroom for exposure to air oxidizes more quickly. I have never heard of using anti-oxidants such as ascorbic acid (Vit. C) in olive oil. It is not very soluble in oil. Better to buy your oil in small quantities and use it up.
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