Uncoated Cast Iron Cookware Seasoning & Oil, ranked by PFAS safety
All 7 products with no coating at all in our cast iron cookware seasoning & oil database, graded Bad to Excellent and ranked safest first. 4 earn a buy-worthy grade.
Coconut Oil
Cast Iron Ultimate Bundle
cast iron, bare or seasoned with coconut oil
Iron leaching into food
Limited concern
Rust and surface degradation
Limited concern
Lower concern; bare cast iron is inherently PFAS-free.
⚠Risky category by default
Canola Oil
Mazola Canola Oil
Pure canola oil, uncoated liquid
Oxidation and rancidity (storage-related degradation)
Limited concern
Lower concern; cooking oil product, not cookware.
⚠Risky category by default
Vegetable Oil
Clarks Cast Iron Seasoning Oil
Vegetable oil seasoning, no coating applied
Oxidative degradation and rancidity
Limited concern
Smoke point exceedance and thermal degradation
Limited concern
Allergenic or inflammatory seed oils
Limited concern
Lower concern; plain vegetable oil contains no PFAS by nature.
⚠Risky category by default
Sesame Oil
Chosen Foods Toasted Sesame Oil
sesame oil, no coating or treatment
Oxidation and rancidity
Limited concern
Smoke point / thermal decomposition risk
Limited concern
Allergen cross-contamination
Limited concern
Lower concern; pure cooking oil requires no PFAS-associated coatings.
⚠Risky category by default
Cast Iron Seasoning Oil Pack (3 2 oz tins) | Protects & Builds Non‐Stick, All Natural, Food‐Safe
vegetable oil seasoning (no coating applied)
Oil oxidation and rancidity
Limited concern
Allergen risk (tree nut or seed oils)
Limited concern
Contamination during application
Limited concern
Lower concern; seasoning oil alone carries minimal PFAS risk.
⚠Risky category by default
Bacon Grease
Bacon Up Bacon Grease
rendered pork fat, no coating
Fat oxidation and rancidity
Limited concern
Container leachables from storage vessel
Limited concern
Bacterial contamination if improperly stored
Limited concern
Lower concern; rendered fat product, not cookware.
⚠Risky category by default
Field Company
Cast Iron Seasoning Oil
Hemp oil seasoning, applied to bare cast iron
Oil oxidation and rancidity
Limited concern
Smoke or fume inhalation at high heat
Limited concern
Lower concern; hemp oil is inherently PFAS-free; cast iron is bare material.
⚠Risky category by default
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