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Basic Cooking Skills
How to Know when Sesame Oil Is Rancid Co-authored by Yoko Isassi
Last Updated: January 27, 2026
Examining the Oil
|
Determining the Shelf Life
|
Q&A
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Tips
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This article was co-authored by Yoko Isassi. Yoko Isassi is a Japanese Food Specialist and the Founder of Foodstory in Los Angeles, California. Since 2011, she has taught others how to cook Japanese food and educated others about Japanese food culture. Yoko holds an MA from Columbia University. This article has been viewed 120,151 times.
If you cook with sesame oil, it’s important to be aware of signs of rancidity, as sesame oil has a much shorter shelf life than other plant-based oils. If you're concerned with the condition of your sesame oil, take note of its color, odor, and flavor in order to determine whether or not your sesame oil is safe to consume.
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Part 1 Part 1 of 2:
Examining the Oil
1 Check your oil for a dark, amber color. Sesame oils that appear darker in color than usual - a deep amber hue as opposed to a light golden color - are often rancid. Compare the color of your oil to images of sesame oil online to determine whether or not your oil is rancid.[1]XResearch source
2 Feel the bottle to see if it's sticky. A sticky residue will develop on the outside of a rancid oil container. If your bottle of sesame oil is uncharacteristically sticky, this is likely a symptom of rancidity.[2]XResearch source Advertisement
3 Note a harsh, acrid smell. Fresh sesame oil has a fragrant, nutty odor. In comparison, rancid oil smells acrid, bitter, and soapy. Give your oil a whiff, and if the smell is harsh on your nose, it’s probably best to throw it out.[3]XResearch source
4 Taste the oil for signs of bitterness. If the sight and smell of your oil are not telling enough, try tasting a tiny amount of your sesame oil to determine once and for all if the oil is rancid. If the oil tastes acrid or bitter, it is rancid and unsafe to cook with.[4]XResearch source
If you decide to taste-test your sesame oil, consume no more than a drop in case the oil is rancid.
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Determining the Shelf Life
1 Check the “Use By” date on the bottle. If your sesame oil displays any physical signs of rancidity, and if the oil’s “use by” date is long past, it’s safe to say your oil is probably rancid. If the "use by" date has passed but your oil looks, smells, and tastes fresh, it's probably fine to use the oil.[5]XResearch source
2 Throw away any sesame oil that's over 2 years old. Most sesame oil will stay fresh for no longer than 2 years, regardless of its storage conditions. Keep these guidelines in mind when you inspect your sesame oil for signs of rancidity to determine the likelihood of its freshness.[6]XResearch source
Unopened sesame oil will stay fresh for up to 1 year when stored at room temperature, and up to 2 years when refrigerated.
An opened container of sesame oil will stay fresh for 6-8 months when left at room temperature, and up to 2 years when refrigerated.
3 Inspect the storage environment of your sesame oil. If your bottle of sesame oil has been left open and/or in direct sunlight for longer than 1-2 months, and you notice a change in its color or odor, it's best to throw it away. These storage conditions often cause sesame oils to go rancid. Practice safe storage techniques to prevent rancid oil in the future.[7]XResearch source
Sesame oil stays fresh for longest when it is sealed tightly and stored in a cool, dry location, away from direct sunlight or other sources of heat.
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Question Can I use rancid sesame oil for skin or hair? Maggie Peterson Community Answer No, if it is rancid it has bacteria in it that will not be good for your skin or hair. It will also smell bad. Thanks! We're glad this was helpful.Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 6 Helpful 6
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Tips
If you suspect that your sesame oil is rancid, play it safe and throw it away. Rancid oil is not just gross, but can make you sick.[8]XResearch sourceThanks Helpful 0 Not Helpful 0
If you don’t use sesame oil very frequently, consider buying it in small quantities to avoid the possibility of its spoilage [9]XResearch sourceThanks Helpful 0 Not Helpful 0
While sesame oil stays freshest when stored in the fridge, it will stay relatively fresh in pantry, so long as it’s protected from sunlight.[10]XResearch sourceThanks Helpful 0 Not Helpful 0
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Co-authored by: Yoko Isassi Japanese Food Specialist This article was co-authored by Yoko Isassi. Yoko Isassi is a Japanese Food Specialist and the Founder of Foodstory in Los Angeles, California. Since 2011, she has taught others how to cook Japanese food and educated others about Japanese food culture. Yoko holds an MA from Columbia University. This article has been viewed 120,151 times. 3 votes - 100% Co-authors: 5Updated: January 27, 2026 Views: 120,151 Categories: Basic Cooking Skills In other languages Spanish Japanese
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Is Your Fish Good to Eat? Signs of Spoilage & Storage Tips 
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Co-authored by: Yoko Isassi Japanese Food Specialist This article was co-authored by Yoko Isassi. Yoko Isassi is a Japanese Food Specialist and the Founder of Foodstory in Los Angeles, California. Since 2011, she has taught others how to cook Japanese food and educated others about Japanese food culture. Yoko holds an MA from Columbia University. This article has been viewed 120,151 times. 3 votes - 100% Co-authors: 5 Updated: January 27, 2026 Views: 120,151 Categories: Basic Cooking Skills In other languages Spanish Japanese 
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1 Check your oil for a dark, amber color. Sesame oils that appear darker in color than usual - a deep amber hue as opposed to a light golden color - are often rancid. Compare the color of your oil to images of sesame oil online to determine whether or not your oil is rancid.[1] 
2 Feel the bottle to see if it's sticky. A sticky residue will develop on the outside of a rancid oil container. If your bottle of sesame oil is uncharacteristically sticky, this is likely a symptom of rancidity.[2] Advertisement 
3 Note a harsh, acrid smell. Fresh sesame oil has a fragrant, nutty odor. In comparison, rancid oil smells acrid, bitter, and soapy. Give your oil a whiff, and if the smell is harsh on your nose, it’s probably best to throw it out.[3] 
4 Taste the oil for signs of bitterness. If the sight and smell of your oil are not telling enough, try tasting a tiny amount of your sesame oil to determine once and for all if the oil is rancid. If the oil tastes acrid or bitter, it is rancid and unsafe to cook with.[4] 
Maggie Peterson Community Answer No, if it is rancid it has bacteria in it that will not be good for your skin or hair. It will also smell bad. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 6 Helpful 6