Cast Iron Cookware Seasoning & Oil, ranked by PFAS safety
29 products graded from Bad to Excellent, safest first. 20 grade Good or better and are worth buying.
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The best non-toxic cast iron cookware seasoning & oil, ranked safest first
Bad · Better · Best cast iron cookware seasoning & oil
The quickest read, what to skip and the top-graded picks worth buying instead.
Field Company
Field Company Cast Iron Seasoning Oil
Lower concern; hemp oil is inherently PFAS-free; cast iron is bare material.
Canola Oil
Wesson Canola Oil
Lower concern; liquid oil product, not cookware.
Coconut Oil
Cast Iron Ultimate Bundle
Lower concern; bare cast iron is inherently PFAS-free.
Worth buying Good or Excellent, safest first
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
Wesson Canola Oil
Refined canola oil, liquid
Oxidation and rancidity on storage
Limited concern
Trans fats from processing
Limited concern
Lower concern; liquid oil product, not cookware.
⚠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
Cast Iron Seasoning Oil - Case of 20
vegetable oil
Oxidation and rancidity
Limited concern
Lower concern; pure vegetable oil has no PFAS risk.
⚠Risky category by default
Coconut Oil
Great Value Organic Naturally Refined Coconut Oil
Refined coconut oil, edible liquid
Thermal degradation and oxidation products
Limited concern
Lead
Limited concern
Pesticide residue
Limited concern
Rancidity and mold if stored improperly
Moderate concern
Lower concern; edible oil, not cookware equipment.
⚠Risky category by default
Coconut Oil
O Organics O Organic Coconut Oil Virgin Unrefined
Virgin coconut oil, food product
Microbial contamination (mold, aflatoxins)
Limited concern
Oxidation and rancidity (free radicals)
Limited concern
Lower concern; unrefined coconut oil is a bare food product.
⚠Risky category by default
Lodge
Canola Oil Seasoning Spray 8 fl oz
Canola oil (liquid vegetable oil)
Oxidation and rancidity (food quality, not safety per se)
Limited concern
Inhalation risk from spray propellant
Limited concern
Lower concern; pure cooking oil, not a cookware product.
⚠Risky category by default
Sesame Oil
Kikkoman Sesame Oil
Sesame oil, liquid
Oxidative degradation and rancidity
Limited concern
Allergen contamination (sesame)
Moderate concern
Lower concern; liquid oil product, not a cookware item.
⚠Risky category by default
Crisbee Puck Cast Iron Seasoning
Soybean oil, beeswax blend
Soybean oil oxidation and rancidity
Limited concern
Beeswax purity and contaminants
Limited concern
Lower concern; traditional seasoning oil without non-stick coatings.
⚠Risky category by default
Hemp Oil
Carrington Farms Hemp Oil
Hemp seed oil, liquid cooking oil
Oxidation and rancidity from polyunsaturated fat content
Limited concern
Lower concern; unrefined plant oil has no known PFAS risk.
⚠Risky category by default
Cast Iron Seasoning Oil
Soybean oil
Rancidity and oxidative byproducts
Limited concern
Pesticide residue
Limited concern
Lower concern; pure oil has no PFAS exposure pathway.
⚠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
Sesame Oil
KADOYA Pure Sesame Oil
Pure sesame oil, liquid edible oil
Oxidative rancidity and degradation
Limited concern
Smoke point and thermal degradation
Limited concern
Lower concern; pure oil product, no PFAS-prone coatings.
⚠Risky category by default
Sesame Oil
Good & Gather Organic Virgin Sesame Oil
Cold-pressed virgin sesame oil
Oxidative rancidity and degradation
Limited concern
Heavy metals
Limited concern
Allergen cross-contamination
Limited concern
Lower concern; oil product, not cookware; no PFAS pathway typical.
⚠Risky category by default
Sesame Oil
La Tourangelle Toasted Sesame Oil
Sesame oil, liquid cooking oil
Oxidative degradation and rancidity
Limited concern
Allergen presence (sesame)
Moderate concern
Lower concern; liquid oil, not a PFAS-risk category.
⚠Risky category by default
Sesame Oil
Napa Valley Naturals Organic Sesame Oil
Organic sesame oil, liquid
Oxidative degradation and rancidity
Limited concern
Pesticide residue
Limited concern
Allergen contamination (cross-contact)
Limited concern
Thermal degradation products (if overheated)
Limited concern
Lower concern; unprocessed oil requires no chemical coatings.
⚠Risky category by default
Peanut Oil
LouAna Peanut Frying Oil 3 gal
Refined peanut oil, liquid cooking oil
Thermal breakdown (oxidation) at high heat
Limited concern
Rancidity from storage degradation
Limited concern
Lower concern; pure peanut oil does not require PFAS treatments.
⚠Risky category by default
Cast Iron Seasoning
Cast iron seasoning oil/fat layer
Oil/fat rancidity (if liquid product)
Limited concern
Smoke/fume inhalation during application
Limited concern
Lower risk. Cast iron seasoning is bare metal with oil layer.
⚠Risky category by default
Toups
Cast Iron Chris Seasoning & Maintenance Compound
mineral oil and natural wax blend
Rancidification or oxidation
Limited concern
Wax buildup over time
Limited concern
Lower PFAS risk. Bare cast iron seasoning uses only mineral oil.
⚠Risky category by default
Graded and flagged Poor and Bad, we’d swap these
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
Coconut Oil
CVS Gold Emblem Abound Extra Virgin Coconut Oil
Extra virgin coconut oil, liquid edible oil
Oxidative rancidity at elevated cooking temperatures
Limited concern
Lower concern; edible oil product with no known PFAS risk.
⚠Risky category by default
Coconut Oil
Camp Chef Cast Iron Conditioner
Coconut oil, food-grade conditioner
Rancidity and oxidation over time
Limited concern
Smoke point limitation
Moderate concern
Lower concern; coconut oil conditioner is not a PFAS vector.
⚠Risky category by default
Toups
Cast Iron Seasoning Spray
mineral oil and wax blend
Oxidative rancidity and off-gassing
Limited concern
Wax residue buildup and carbonization
Limited concern
Lower risk. Cast iron seasoning is oil-based, not PFAS-prone.
⚠Risky category by default
Toups
Cast Iron Seasoning (Regular)
Oil-based seasoning blend for cast iron
Rancidity and oxidative breakdown of oil
Limited concern
Smoke and irritation from overheating
Limited concern
Lower risk. Oil seasoning on bare iron poses no PFAS concern.
⚠Risky category by default
Toups
Walrus Oil Cast Iron Seasoning, 4 oz
mineral oil seasoning blend
Mineral oil food contamination from improper wiping
Limited concern
Oxidation and rancidity from extended storage or heat exposure
Limited concern
Lower risk. Walrus Oil is traditional mineral oil seasoning without PFAS.
⚠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
Verdana Organic Cast Iron Seasoning Oil – Food Grade
Coconut oil (organic, food-grade)
Oxidation and rancidity (lipid degradation)
Limited concern
Smoke point exceeded (thermal degradation products)
Limited concern
Allergen or contaminant presence (coconut allergy)
Limited concern
Lower concern; organic coconut oil has no PFAS exposure route.
⚠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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