Last reviewed: July 2026

What You Need to Know

“Peanut-free” is not a legally defined term. No law defines it. No threshold applies. There is no requirement that a food labeled “peanut-free” was made on dedicated equipment or in a dedicated facility. It means whatever the manufacturer wants it to mean.
“May contain peanuts” is voluntary and unregulated. No law requires it, and no law defines the risk it represents. The wording — “may contain” vs. “shared facility” vs. “shared equipment” — tells you nothing about actual risk level.
Highly refined peanut oil is generally safe for most people with peanut allergy. Cold-pressed and expeller-pressed peanut oil is not. (The old version of this page said avoid all of it — that was wrong, though the practical advice still holds when you can’t verify which you’re getting.)
Casual contact doesn’t usually cause anaphylaxis. Ingestion does. Hand-to-mouth transfer does.
There are now real treatments that reduce the danger of accidental exposure. This is new.

The Uncomfortable Answer to the Title Question

You’d assume “peanut-free” on a package is a regulated claim, like “organic” or “gluten-free.”

It isn’t.

Gluten-free is legally defined — packaged foods bearing it must contain less than 20 parts per million of gluten. There is no equivalent for peanut. “Peanut free,” “nut free,” and “dairy free” are voluntary marketing claims, tied to no threshold, with no requirement for dedicated equipment or a dedicated facility.

This doesn’t mean the label is worthless. A manufacturer making that claim has a strong commercial and legal incentive to mean it, and many run genuinely dedicated lines. It means the label is a manufacturer’s promise, not a legal guarantee — and for a severely allergic child, the difference matters.

What to do about it: for foods your child eats regularly, contact the manufacturer once and ask directly what their “peanut-free” claim is based on. Dedicated facility? Dedicated line? Tested to what threshold? Companies will usually tell you. It’s twenty minutes of work that buys you years of confidence.

Decoding the Labels

✅ The ingredient list — this part IS regulated

Peanut is one of the nine major allergens under US law. If peanut protein is an intentional ingredient, the word “peanut” must appear — in the ingredient list or in a “Contains” statement. This part you can trust.

⚠️ “May contain” / “shared facility” / “shared equipment” — voluntary and unregulated

These are precautionary allergen labels (PAL), and here’s what you need to understand about them:

No law requires them. A product with genuine cross-contact risk may carry no warning at all.
No law defines what they mean. The contamination level isn’t declared and could range from undetectable to significant.
The wording is meaningless as a risk signal. Studies find no relationship between the phrase chosen and the actual risk. Yet around 80% of allergic consumers avoid “may contain” while fewer than half avoid “shared facility” — a distinction that has no basis.
Most of them are over-cautious. It’s estimated that roughly 90% of products carrying these warnings contain no detectable peanut protein.

So should you ignore them? No — and here’s the honest reasoning. The problem isn’t that the warning means danger. The problem is that you cannot tell which 10% is which. That’s an unquantifiable risk on a potentially fatal outcome, which is why most allergists still advise avoiding them.

But this is genuinely a conversation to have with your allergist, based on your child’s reaction history and sensitivity threshold. Some families, with medical guidance, safely relax on shared-facility labels while holding firm on “may contain.” That’s a legitimate, individualized decision — not a failure of vigilance. Blanket rules made by strangers on the internet are not how this should be decided.

🔍 Names to know

Mandelona / “new nuts” — peanuts flavored and cut to resemble almonds. Avoid.
Lupin (lupine) — this one is important and new. A legume that cross-reacts with peanut at a high rate, not covered by US allergen labeling law, and increasingly common in gluten-free and vegan flours. If your child eats gluten-free products, ask your allergist about lupin.
Arachis — another name for peanut.

More on reading labels properly: understanding food labels.

Peanut Oil: The Correction

This page previously said “peanut-free” means no peanut oil at all. That was wrong, and the distinction is worth knowing:

Type	Contains peanut protein?	Labeling
Highly refined peanut oil	Protein removed in processing. Studies show it’s tolerated by most people with peanut allergy.	Exempt from allergen labeling
Cold-pressed, expeller-pressed, or extruded peanut oil	Yes — retains protein	Must be labeled “peanut”

The practical problem: in a restaurant or a bakery, you have no way of knowing which one they used. Which is why “avoid peanut oil when you can’t verify it” remains sound advice — but for the right reason. It’s not that all peanut oil is dangerous. It’s that you can’t tell.

Talk to your allergist. Some people with peanut allergy are advised they can eat highly refined peanut oil; others aren’t. It depends on you.

Cross-Contact: What Actually Causes Reactions

Cross-contact is when a safe food touches an allergen — through shared utensils, surfaces, equipment, or hands.

The classic mechanism, and the one that kills: a knife used for peanut butter, then used in the butter or the jam. A shared tub. A sandwich packed alongside a peanut butter sandwich. The lesson isn’t “peanut butter is scary” — it’s that the danger is almost always a shared implement or a shared container, not the peanut itself sitting across the room.

What’s actually risky

Eating it. By far the main route.
Hand-to-mouth transfer. Someone eats peanut butter, touches a table or a toy; a child touches it and puts a hand in their mouth.
Shared utensils, cutting boards, fryer oil, ice cream scoops, tongs, bakery display cases.
Unlabeled food — bakery counters, deli items, market stalls. If there’s no ingredient label and nobody can tell you the process, treat it as unknown.

What’s much less risky than people fear

Being in the same room as peanuts. Peanut protein is not airborne in the way people imagine. Simply being near peanuts generally does not trigger anaphylaxis.
Smelling peanut butter. The smell is volatile compounds, not protein.

Someone with asthma and peanut allergy may wheeze or develop hives in a peanut-heavy environment, and any such symptom needs to be treated seriously. But the widespread belief that proximity alone causes anaphylaxis has driven enormous anxiety and enormous restriction, and the evidence doesn’t support it.

Steam is a real exception — protein can be carried in the steam from cooking, so a hot open pan is not the same as a jar on a shelf.

What Actually Works: Cleaning

This is the most practical thing on the page.

Surfaces: peanut protein (Ara h 1) is readily removed from tables, book covers, and plastic toys using common household and hospital cleaning wipes. Studies detected peanut protein on all these surfaces after peanut butter contact — and none afterward, with any of the cleaning products tested. Ordinary cleaning genuinely works. This should be routine in classrooms and daycares.

Hands: soap and water, or a wet wipe. Not hand sanitizer — alcohol gel is designed to kill microbes, not to remove food protein, and it does not reliably clear peanut residue from hands. This is one of the most useful and least-known facts in food allergy management. Wash, don’t sanitize.

Bans, Schools, and What Actually Keeps Children Safe

The instinct is a blanket peanut ban. It’s understandable, and it’s not the whole answer.

The problem with relying on bans: they create a false sense of security. Nobody can enforce a truly peanut-free environment — food comes in from a hundred homes, labels are unregulated (see above), and one packed lunch defeats the policy. A school that believes it is peanut-free may be less prepared for the reaction when it happens.

What matters more:

Epinephrine on site, accessible, and staff trained to use it. This is the one that saves lives. Everything else is prevention; this is the intervention.
A written allergy action plan for the child.
No food sharing. Simple, enforceable, effective.
Handwashing before and after eating. Soap and water.
Cleaning tables before and after meals.
Designated seating where appropriate — not isolation.
Bring your own food for a severely allergic child when food is involved. This remains the safest single rule.

The right approach isn’t a ban or nothing — it’s preparedness over prohibition, with sensible restriction on top. And it should be agreed among the school, the affected family, and other parents, not imposed and resented.

See peanut allergy bracelets for medical ID, and asthma: help your child breathe easier — uncontrolled asthma is a major risk factor for fatal anaphylaxis, so if your child has both, the asthma is not a side issue.

Everyone around your child should know how to use epinephrine. And knowing CPR is worth your time.

The Part That’s Genuinely Changed: Treatment

For the first time, avoidance isn’t the only option.

Xolair (omalizumab) — FDA-approved in February 2024. An injection every 2–4 weeks for adults and children aged 1 and older with IgE-mediated food allergy. It reduces the risk of a serious reaction from accidental exposure, across multiple foods. In the trial, 68% of people who received it could tolerate a dose equivalent to about 2.5 peanuts without moderate-to-severe symptoms.

Oral immunotherapy (OIT) — gradually increasing controlled doses of peanut protein under an allergist’s supervision, to raise the threshold at which a reaction occurs. Palforzia was the first FDA-approved version; allergist-administered OIT protocols continue to be widely used. Never attempt OIT on your own. It carries real risk of severe reaction and must be supervised.

Crucially, neither is a cure. Both are about surviving an accident — you still avoid peanut, and you still carry epinephrine. Xolair is explicitly not for emergency treatment of a reaction.

Still: for a family that has spent years terrified of a birthday party, “an accidental exposure is now much less likely to be catastrophic” is a genuinely different life. Ask your allergist whether either is right for your child.

More: peanut allergy treatment · peanut allergy testing · peanut allergy symptoms.

One More Thing, For Parents of Babies

There’s a tension worth naming. Everything above is about avoiding peanut. But for infants who don’t yet have a peanut allergy, the current guidance is early introduction, not avoidance — introducing peanut in an infant-safe form early in the first year substantially reduces the chance of developing the allergy at all.

These aren’t contradictory. Avoidance is for the child who is already allergic. Early introduction is for the child who isn’t yet — and is how you try to keep them that way.

If your baby has severe eczema or egg allergy, talk to a doctor before introducing peanut. Otherwise, don’t delay it. See allergic reactions and talk to your pediatrician.

The Bottom Line

“Peanut-free” is a promise, not a legal standard. “May contain” is a guess, not a measurement.

What you can actually rely on: the ingredient list, soap and water, no food sharing, epinephrine within reach, and people around your child who know how to use it.

Global Statistics

Peanut-Free: What It Actually Means (and What It Doesn’t)