Peanut oil: refined passed 60 allergic people, crude did not

The question most people bring to peanut oil is whether it can set off a peanut allergy, and for one kind of oil the answer is unusually clean. In a double blind crossover challenge, 60 people whose peanut allergy had been confirmed by challenge testing were given refined peanut oil and crude peanut oil. None of the 60 reacted to the refined oil. Six of them, 10 percent, reacted to the crude oil. That was one refining standard tested in one hospital investigation unit, so it says nothing about cold-pressed or gourmet oil sold under the same name, and nothing about a kitchen where the oil has met the nut. Which of the two is in a bottle on a shelf or in a restaurant fryer is not something this trial can tell you. Past allergy, this is fat and vitamin E. The single USDA entry for peanut oil holds 15.23 mg of vitamin E per 100 g, 102 percent of the Daily Value, with 16.2 g of saturated fat and 4.263 micrograms of vitamin K. A tablespoon is 14 g, a seventh of those figures.

The numbers, per 100 g

What your body absorbs

• A pharmacological dose of vitamin D3 taken fasting gave higher serum vitamin D3 from a peanut oil vehicle than from a medium chain triglyceride, and the two vehicles matched once the dose was taken with food. — adults given a single pharmacological dose of vitamin D3 in two lipid vehicles, serum vitamin D3 and 25-hydroxyvitamin D3 followed serially by HPLC (n = not reported in the abstract) Evidence B source
  Significantly higher serum vitamin D3 after the peanut oil vehicle in the fasting state, no difference with food, only small differences in 25-hydroxyvitamin D3

What it does to your health

• Giving 129 adults peanut oil worth 30% of resting energy expenditure for 8 weeks left appetite ratings unchanged, and they compensated for only 46% of those calories, against 66% reported earlier for whole peanuts. — 129 healthy adults from Brazil, Ghana and the USA randomised to peanut, olive or safflower oil at 30% of resting energy expenditure, or no intervention, for 8 weeks (n = 129) Evidence B source
  No change in appetite ratings, dietary compensation 46% for peanut oil versus 66% previously seen with whole peanuts, total intake up 197 kcal at week 8
• When 251 moderately hypercholesterolaemic Chinese adults cooked with peanut oil, corn oil or a blend oil for a whole year, fasting lipids, hsCRP, glucose and insulin ended up no different between the three oils. — 251 volunteers with fasting total cholesterol between 5.13 and 8.00 mmol/L, two university hospitals in Guangzhou, one year of cooking with the assigned oil (n = 251) Evidence B source
  No significant difference in fasting plasma lipids, hsCRP, glucose or insulin between the three oils, while alpha-linolenic acid in erythrocyte membranes rose only in the blend oil group (P below 0.001)

Safety, limits and interactions

• In a double blind crossover challenge of 60 people with confirmed peanut allergy, none reacted to refined peanut oil, while 6 of them (10%) reacted to crude peanut oil. — 60 subjects allergic to peanuts, allergy confirmed by challenge tests, dedicated clinical investigation unit in a university hospital (n = 60) Evidence B source
  0 of 60 reacted to refined oil versus 6 of 60 (10%) to crude oil
• Pooling global measurements of peanut oil, aflatoxin B1 was found in 47.9% of samples at a pooled 2.30 micrograms per kg, and the modelled margin of exposure fell below 10,000 for adults in Ethiopia, Sudan and the USA and for children in the USA. — studies of aflatoxin concentration in peanut oil published between 2005 and April 2022, pooled by country and toxin type, laboratory measurements of oil samples and not people (n = pooled across countries, study count not given in the abstract) Evidence D source
  Pooled AFB1 prevalence 47.9%, overall aflatoxin prevalence 49.30% (95% CI 35.80 to 62.84), pooled AFB1 concentration 2.30 micrograms per kg

What people believe that the data does not support

• The EU health claim register holds no authorised claim for peanut oil, and the wording that two tablespoons a day within a diet low in saturated fat help achieve healthy cholesterol levels and promote heart health was refused as claim POL-HC-7733. — regulatory decision of the European Union, applies to labels sold in the EU and not to any measured group of people Evidence E source
  Status Non-authorised for the peanut, peanut butter and peanut oil cholesterol and heart health claim; 0 authorised and 3 refused claims for peanut in the register

The bottom line

Cooked in real kitchens for a year, peanut oil behaved like the other bottles on the shelf. 251 adults in Guangzhou with fasting total cholesterol between 5.13 and 8.00 mmol/L cooked with peanut oil, corn oil or a blend oil for twelve months. Fasting lipids, hsCRP, glucose and insulin ended the year no different between the three oils, and only the blend raised alpha-linolenic acid in red cell membranes (p below 0.001). That was oil against oil inside a habitual diet, not oil against no added oil, and everyone in it started with moderately raised cholesterol. The oil is easier to overeat than the nut. 129 healthy adults in Brazil, Ghana and the USA were randomised to peanut, olive or safflower oil worth 30 percent of resting energy expenditure, or to nothing, for eight weeks. Appetite ratings did not change, total intake was 197 kcal higher at week 8, and the people on peanut oil offset only 46 percent of the calories it added. An earlier trial of whole peanuts reported 66 percent offset, and that figure comes from a separate study rather than from a comparison inside this one. Do not expect a heart claim from the label. The European Union register holds no authorised health claim for peanut oil, and the wording that two tablespoons a day within a diet low in saturated fat help achieve healthy cholesterol levels and promote heart health was refused as claim POL-HC-7733. A refusal means the evidence submitted did not satisfy the assessment. Two more things belong here. Aflatoxin B1 was detected in 47.9 percent of the peanut oil samples pooled from studies published between 2005 and April 2022, at a pooled 2.30 micrograms per kg. The authors modelled a margin of exposure below 10,000 for adults in Ethiopia, Sudan and the USA and for children in the USA. That is how often a contaminant turns up in oil on sale, plus a model, and not illness counted in anybody. And if you ever swallow vitamin D dissolved in oil, a 1990 study is worth knowing. A pharmacological dose of D3 gave higher serum D3 from a peanut oil vehicle than from a medium chain triglyceride when taken fasting, and the two vehicles were equal once the dose went down with food. That abstract never states how many people took part. No card on this page covers pregnancy, children, kidney disease, frying temperatures, peanut-allergic children, or any refining standard other than the single one tested in 1997.

Sources

1. pnoil-dr4-03 · randomised controlled comparative trial
   In the fasting state, the serum levels of vitamin D3 were significantly higher after administration in peanut oil than after administration in the medium chain triglyceride. When the vitamin D3 dose was ingested together with food no difference between the two formulations was observed.
   Biopharm Drug Dispos, 1990 · checked 2026-09-24
2. pnoil-dr4-04 · randomised controlled trial
   No differences in appetitive ratings were observed over the 8-week trial...A prior intervention with whole peanuts reported a dietary compensation score of 66% over 8 weeks, this compares to a 46% compensation score observed with peanut oil.
   Int J Obes (Lond), 2006 · checked 2026-09-24
3. pnoil-dr4-05 · randomised controlled trial
   No significant differences were observed in the concentrations of fasting plasma lipids, hsCRP, glucose, and insulin among the three groups using different types of plant oils.
   Food Funct, 2020 · checked 2026-09-24
4. pnoil-dr4-01 · randomised controlled crossover challenge trial
   None of the 60 subjects reacted to the refined oil; six (10%) reacted to the crude oil.
   BMJ, 1997 · checked 2026-09-24
5. pnoil-dr4-02 · meta-analysis of laboratory measurements of food samples
   Pooled prevalence of AFB1 in peanuts oil was 47.9%; AFB2, 46.45%; AFG1, 46.92% and AFG2, 54.01%...Pooled concentration of AFB1 in peanuts oil was 2.30 μg/kg
   Rev Environ Health, 2023 · checked 2026-09-24
6. pnoil-dr4-06 · EU health claim register entry, regulation
   POL-HC-7733 Peanuts, Peanut butter, Peanut oil Consuming a small handful, about 30 grams, of peanuts a day as part of a diet low in saturated fat helps to achieve healthy cholesterol levels and promotes heart health. Consuming two tablespoons, about 30g, of peanut butter a day as part of a diet low in saturated fat helps to achieve healthy cholesterol levels and promotes heart health. Consuming two tablespoons, about 30 grams of peanut oil a day as part of a diet low in saturated fat helps to achieve healthy cholesterol levels and promotes heart health. Non-authorised
   EU Register on nutrition and health claims, claim POL-HC-7733, snapshot 2026-09-21 · checked 2026-09-24