Why Flaxseed Oil Needs Careful Storage

What is actually happening

• Flaxseed oil's fat content is more chemically reactive than the fat in many other cooking oils, making it break down faster once exposed to air.
• Light exposure speeds this same breakdown, which is why flaxseed oil is often sold in a dark bottle.
• Heat accelerates it further still, which is the same underlying reason flaxseed oil is never used for cooking.
• None of this makes the oil unsafe to buy or use, it simply means the storage window between opening and finishing the bottle should be shorter.

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Flaxseed oil sensitivity questions

Is flaxseed oil unusually fragile compared to other oils?

Yes, its particular fat content is more reactive to air, light and heat than most common cooking oils.

Does this mean flaxseed oil is a lower quality product?

No, it is simply a property of the oil itself, which is why it needs different storage habits than a typical cooking oil.

Does buying a smaller bottle help?

Yes, finishing a smaller bottle faster reduces the time it spends exposed to air after opening.

Is this the same reason it cannot be heated?

Yes, the same reactive fat content that needs careful storage is what breaks down under cooking heat.