The divide between refined and cold-pressed versions has life-or-death stakes for consumers with legume sensitivities. Clinical assessments highlighted in The Telegraph detailing dietary oil choices caution that mechanical pressing preserves peanut allergy allergen proteins like Ara h 1, Ara h 2, and Ara h 3. Even minute traces of these seed proteins trigger severe IgE-mediated anaphylaxis in sensitized individuals.
Chemical solvent refining combined with alkali neutralization and high-temperature steam deodorization strips those proteins down to virtually undetectable levels. The US Food and Drug Administration (FDA) exempts highly refined peanut oil from federal allergen labeling mandates on finished food packaging for this reason. Even so, immunologists urge strict caution. If a consumer with an allergy purchases a bottle labeled "groundnut oil," the likelihood of residual proteins remains exceptionally high unless the package explicitly states it has undergone full industrial refining.
