Myth: Flaxseed oil is the best for seasoning cast iron cookware.
Truth: The internet is awash with recommendations for cast iron seasoning techniques. Some are solid, some are suspect, but the flaxseed oil method is particularly divisive. We’ve done the research, and flaxseed oil flunks the test: While it produces a dark patina, it forms a brittle seasoning that won’t stand up to regular cooking.
The best cast iron seasoning oils, like our own everyday Seasoning Oil blend, are high in polyunsaturated fats and naturally inclined to convert to seasoning. Read our guide to cast iron seasoning oils for a deep dive into the science of seasoning.