Can you mix hydrogen peroxide and vinegar?

No. The New Jersey Department of Health says hydrogen peroxide and vinegar form peracetic acid, which irritates the eyes, skin and lungs, and NC Cooperative Extension lists the pair among combinations never to mix. Peracetic acid in concentrated form is a highly corrosive chemical. Nobody has published how strong a kitchen mixture of 3 percent peroxide and 5 percent vinegar gets, so treat any mixture as hazardous. The popular tip of spraying one right after the other puts both on the same wet surface, and no agency or extension source reviewed for this page tests or endorses it. Keep the two in separate, labeled bottles and use one at a time.

What forms when the two meet

Hydrogen peroxide and acetic acid, the acid in vinegar, combine to form peracetic acid (also called peroxyacetic acid). Industry makes it on purpose this way: an occupational health article from the American Industrial Hygiene Association describes peracetic acid as produced by reacting acetic acid and hydrogen peroxide with an acid catalyst, and sold as a solution that still contains acetic acid, hydrogen peroxide and water [1]. A kitchen mixture starts from much weaker ingredients and has no added catalyst, so it may form less, but it is the same reaction.

The New Jersey Department of Health's hazard alert lists "hydrogen peroxide + vinegar" as forming peracetic acid, which irritates the eyes, skin and lungs [2]. NC Cooperative Extension names "vinegar + hydrogen peroxide" among four combinations to never mix [3].

Why "corrosive" is the word that matters

New Jersey's Right to Know fact sheet on peroxyacetic acid calls it a "HIGHLY CORROSIVE CHEMICAL." It says contact can severely irritate and burn the skin and eyes, leading to eye damage; breathing it can irritate the lungs and cause coughing and shortness of breath; and higher exposures can cause fluid to build up in the lungs, a medical emergency that can be delayed [4].

That fact sheet describes the industrial chemical, which is far stronger than anything you could make from drugstore peroxide and grocery vinegar. It is quoted here to show what kind of substance forms, and the honest gap is this: no source reviewed for this page measured how much peracetic acid a home mixture contains or how quickly it forms. With that unknown, the safe course is to keep the two apart.

The "spray one, then the other" tip

Lifestyle sites often suggest spraying vinegar and then peroxide (or the reverse) on a surface, one right after the other, as a homemade disinfecting method. Here is what the primary sources actually say.

• No agency or extension source reviewed recommends it. The sequence appears on commercial blogs, not in CDC, EPA, poison center or extension publications.
• Spraying one right after the other mixes them on the surface. Two wet sprays on the same counter are two liquids combining, which is the combination New Jersey and NC Extension say not to make [2] [3].
• NMSU's sanitizing statement uses them separately. NMSU's G-313 says "Use heated vinegar or hydrogen peroxide (3%) to sanitize," and that a room-temperature solution "must sit for 10 minutes" [5]. That publication offers vinegar or peroxide, never both together, and cites no data for the claim. It is reported here as NMSU's statement, with no test behind it.
• No homemade mix may be called a germ killer. A claim to sanitize or disinfect is a pesticidal claim under federal law [6], and EPA's minimum risk category, 25(b), allows no germ claims at all [7]. What lab studies found about vinegar is on the does vinegar disinfect page, and drugstore peroxide is covered on the peroxide and alcohol page.

If you need to disinfect, use a registered disinfectant or bleach as CDC directs, on its own. If you only need to clean, one of the two is enough.

Two bottles, two labels

The simplest way to keep peroxide and vinegar apart is to never let them share a bottle, a sprayer or a moment on the counter.

1. Leave peroxide in its own bottle. Poison Control's advice is to keep products in their original containers [8]. Why peroxide is sold in an opaque bottle is explained on the hydrogen peroxide page. Do not decant it into a vinegar sprayer, and do not screw a vinegar sprayer onto the peroxide bottle.
2. Label your vinegar spray with "Never mix with bleach or hydrogen peroxide."
3. Use one, then rinse with water before you reach for the other on the same surface.
4. Store them apart on the shelf, so a leak from one cannot reach the other.

If they have been mixed

If you mixed them in a bottle or sprayed both and your eyes, nose or throat start to burn, stop and get to fresh air [9]. Rinse any skin or eyes the mixture touched with lots of room-temperature water, following the first aid page. Call 911 if anyone collapses, has a seizure, has trouble breathing or cannot be awakened; otherwise call Poison Control at 1-800-222-1222 [9]. Because New Jersey notes that lung effects from peracetic acid can be delayed [4], tell Poison Control about any cough or shortness of breath that starts later. Do not pour the mixture into another cleaner to "neutralize" it. The page for when you have mixed cleaners covers what to do with what is left.

Where vinegar and peroxide each belong

Used one at a time, each has its own cleaning jobs, set out on its ingredient page. The does vinegar disinfect page sets out what vinegar can and cannot do about germs, and the peroxide shelf life page explains why an opened bottle weakens.

References

1. American Industrial Hygiene Association, *The Synergist*, Bechtold K., *Peracetic Acid: Uses and Hazards*, December 2016 issue (page metadata July 3, 2025), read October 2026. https://publications.aiha.org/201612-peracetic-acid-uses-and-hazards
2. New Jersey Department of Health, *Hazard Alert: Mixing Bleach with Other Cleaning Products Can Be Deadly*, undated, read October 2026. https://www.nj.gov/health/workplacehealthandsafety/occupational-health-surveillance/Hazard_Alert-Mixing-Cleaners.pdf
3. NC State Extension, Yancey County Center, Maness N., *Health Risks of Mixing Household Cleaners*, November 1, 2024. https://yancey.ces.ncsu.edu/2024/11/dontmix/
4. New Jersey Department of Health, *Right to Know Hazardous Substance Fact Sheet: Peroxyacetic Acid*, RTK Substance No. 1482, revised October 2004. https://www.nj.gov/health/eoh/rtkweb/documents/fs/1482.pdf
5. New Mexico State University Cooperative Extension Service, Griffiths R. and Koukel S. (rev.), *Green Alternatives to Toxic Household Products*, Guide G-313, revised February 2019. https://pubs.nmsu.edu/_g/G313/index.html
6. U.S. Environmental Protection Agency, *Determining If a Cleaning Product Is a Pesticide Under FIFRA*, last updated July 6, 2026. https://www.epa.gov/pesticide-registration/determining-if-cleaning-product-pesticide-under-fifra
7. U.S. Environmental Protection Agency, *Conditions for Minimum Risk Pesticides*, last updated August 31, 2026. https://www.epa.gov/node/64449
8. Poison Control (National Capital Poison Center), Soloway R.A.G., *What Belongs in a Soft Drink Bottle? The Dangers of Container Transfers*, undated, read October 2026. https://www.poison.org/articles/what-belongs-in-a-soft-drink-bottle
9. Poison Control (National Capital Poison Center), *First Aid for Poisonings*, undated, read October 2026. https://www.poison.org/first-aid-for-poisonings