Corn Oil · Cast Iron Cookware Seasoning & Oil
Great Value Corn Oil
Liquid cooking oil product carries lower PFAS concern.
Corn oil is a liquid, not coated cookware. No PFAS typically used in standard edible oils. Store in glass or metal to minimize any transfer risk.
The better-graded swap
Crisbee
Stik Cast Iron Seasoning
85/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
refined corn oil, liquid
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What Great Value Corn Oil is made of, ingredients and materials
Great Value Corn Oil is a refined vegetable oil extracted from corn kernels and processed to remove solids, water, and some impurities. Refined oils undergo high-temperature extraction and bleaching, which removes most naturally occurring contaminants but also eliminates some micronutrients. As a liquid oil rather than a coated cookware product, it carries no risk of non-stick coating degradation, ceramic glaze leaching, or metal contact contamination that solid cookware poses.
What’s concerning
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
Thermal oxidation and degradation products
All cooking oils, including corn oil, break down under repeated high-heat use and produce aldehydes and other oxidative byproducts. This is inherent to the material, not a brand-specific defect, but risk increases with reuse and storage time. Use at moderate heat and replace when rancid.
Pesticide residue
Great Value does not claim organic certification, so the corn source is likely treated with herbicides (especially glyphosate) and insecticides. Refined processing removes some residues, but trace amounts may persist. No recall or confirmed harm is on record for this product, but consumers concerned with pesticide exposure should choose organic alternatives.
Source, EPA ↗Rancidity and oxidative spoilage
Refined seed oils oxidize over months, especially if stored in warm light. Rancid oil develops off-odors and potentially harmful polar lipids. This is not a manufacturing defect but an inevitable aging process. Monitor smell and replace if musty or off.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Allergen cross-contamination during processing
Corn oil is naturally allergen-free, but shared processing equipment could theoretically introduce traces of tree nuts, peanuts, or soy. No recall or incident is documented for Great Value Corn Oil. Check the label for allergen warnings if you have severe food allergies.
Heavy metals
Corn can accumulate lead and cadmium from soil, but refined oil processing (bleaching, deodorizing) removes most inorganic particles. No heavy metal contamination has been reported in commercial corn oil products. Standard food safety monitoring by the FDA applies.
Source, FDA ↗The full breakdown
The brand's record and disclosure
Great Value (Walmart's house brand) does not publish detailed transparency reports on oil sourcing, pesticide testing, or processing methods. No major recalls or contamination incidents are on public record for this product line. The brand does not advertise organic or non-GMO certification, meaning the corn is likely conventional. Walmart's lack of proactive disclosure is typical for commodity oil brands but leaves processing details opaque.
How it compares in its category
Corn oil sits in the middle of cooking oil safety profiles. It is chemically stable at moderate-to-high heat (smoke point around 450F), with lower concern for degradation and compound release compared to unrefined oils. Organic or expeller-pressed alternatives may reduce pesticide residue exposure but cost more and have no proven safety advantage for the final cooked food. Seed oils like corn, soy, and canola are functionally similar in refined form; choice is mainly about omega fatty acid ratios and heat tolerance, not chemical safety.
If you buy it
Store in a cool, dark place to slow oxidation and rancidity, which develops off-flavors and potentially harmful compounds over time. Use within 1-2 years of purchase; opened bottles degrade faster if exposed to light and heat. Keep below the smoke point (around 450F) during cooking to avoid thermal breakdown products. Do not reuse oil multiple times for deep frying, as repeated heating accelerates oxidative degradation and raises levels of polar compounds associated with inflammation in some studies.
What we don’t know
- Basis
- Model estimate, 92% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Corn Oil has made none
Formulations change between production runs, so check the current label. How we grade.
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More cast iron cookware seasoning & oil grades
How we score, every product runs through the same public 0-100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.