Corn Oil · Cast Iron Cookware Seasoning & Oil
Member's Mark Corn Oil
Refined corn oil with lower PFAS concern based on material type.
Member's Mark Corn Oil is refined corn oil, a material not linked to PFAS. The brand has no PFAS statement on record. No coatings or treatments are noted.
The better-graded swap
Lodge
Cast Iron Seasoning Spray
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
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What Member's Mark Corn Oil is made of, ingredients and materials
Member's Mark Corn Oil is refined vegetable oil extracted from corn kernels, chemically processed to remove impurities, free fatty acids, and pigments. Refinement involves degumming, neutralization, bleaching, and deodorization at high temperature, which removes most contaminants and makes the oil shelf-stable. The resulting product is predominantly linoleic acid (omega-6 polyunsaturated fat) and oleic acid (monounsaturated fat), with minimal residual pesticides or heavy metals from the refining process.
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.
Oxidative degradation and rancidity
Refined corn oil is high in polyunsaturated fats, which are susceptible to oxidation over time, especially if stored in warm, light, or open conditions. Rancid oil may develop off-flavors and free radicals but poses minimal acute toxicity; discard if smell is off.
Thermal degradation at high heat
Heating corn oil above its smoke point (450F) can produce acrolein and other volatile aldehydes. This is a general concern for all refined oils and depends on user behavior, not product formulation; use lower heat or alternative oils if frying at very high temperatures.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Pesticide residue
Corn oil refining (bleaching, deodorization) removes most pesticide residues; no detectable residues are typically reported in refined corn oil. Non-organic corn may contain low levels of herbicides such as glyphosate, but levels in refined oil are not documented as a public health concern.
Source, EPA ↗Heavy metals
Refined corn oil has no known significant concentration of lead, cadmium, or arsenic; soil uptake into corn kernels is minimal compared to leafy greens, and refining further reduces metal bioavailability. No recalls or testing alerts on record for Member's Mark or comparable products.
Source, FDA ↗Allergen cross-contamination
Pure corn oil is naturally gluten-free and dairy-free. Walmart's manufacturing and handling standards are designed to minimize cross-contamination, though shared equipment policies are not product-specifically detailed on the label.
The full breakdown
The brand's record and disclosure
Member's Mark is Walmart's house brand; Walmart publishes general food safety and sourcing standards but does not make product-specific safety certifications publicly prominent for cooking oils. No major recalls or safety controversies specific to Member's Mark Corn Oil are on record. The product meets FDA food safety requirements for vegetable oils, though detailed third-party testing results are not routinely disclosed by the brand.
How it compares in its category
Refined corn oil is one of the most common and affordable cooking oils in North America; it occupies the middle ground between unrefined oils (higher antioxidants, lower smoke point) and highly processed alternatives (higher smoke point, less flavor). Member's Mark pricing and composition are typical for mass-market refined corn oil and do not differ materially from competing store brands or name-brand equivalents in safety profile. Smoke point is approximately 450F, making it suitable for most home cooking applications.
If you buy it
Store in a cool, dark place away from heat and light to slow oxidation and rancidity; refined corn oil has a shelf life of 1 to 2 years if unopened, shorter once opened. Do not heat above 450F (smoke point); at higher temperatures, the oil may degrade and release volatile compounds. Discard if the oil smells rancid or off; opened bottles should be used within 6 to 12 months. No special containers or maintenance is required beyond standard pantry storage.
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.