Hydrogen peroxide: another deadly alternative?

I’m sure most people have heard of hydrogen peroxide. It’s used as a disinfectant and, even if you’ve never used it for that, you probably at least know that it’s used to bleach hair. It’s where the phrase “peroxide blonde” comes from, after all. Hydrogen peroxide, and its formula, is so famous that there’s an old chemistry joke about it:

(I have no idea who to credit for the original drawing – if it’s you, leave me a message.)

To save you squinting at the text, it goes like this:
Two men walk into a bar. The first man says, “I’ll have some H2O.”
The second man says, “I’ll have some H2O, too.”
The barman brings the drinks. The second man dies horribly.

Now I think about it, it’s not a terribly funny joke.

Hydrogen peroxide has an extra oxygen atom in the middle.

Never mind. You get the idea. H2O2 (“H2O, too”) is the formula for hydrogen peroxide. Very similar to water’s formula, except with an extra oxygen atom in the middle. In fact, naturopaths – purveyors of alternative therapies – often refer to hydrogen peroxide as “water with extra oxygen”. But this is really misleading because, to torture a metaphor, that extra oxygen makes hydrogen peroxide the piranha to water’s goldfish.

Water, as we know, is pretty innocuous. You should try not to inhale it obviously, or drink more than about six litres in one go, but otherwise, its pretty harmless. Hydrogen peroxide, on the other hand, not so much. The molecule breaks apart easily, releasing oxygen. That makes it a strong oxidising agent. It works as a disinfectant because it basically blasts cells to pieces. It bleaches hair because it breaks down pigments in the hair shaft. And, as medical students will tell you, it’s also really good at cleaning up blood stains – because it oxidises the iron in haemoglobin to Fe3+, which is a pale yellow colour*.

Dilute hydrogen peroxide is readily available.

In its dilute form, hydrogen peroxide is a mild antiseptic. Three percent and even slightly more concentrated solutions are still readily available in high-street pharmacies. However, even these very dilute solutions can cause skin and eye irritation, and prolonged skin contact is not recommended. The trouble is, while it does destroy microbes, it also destroys healthy cells. There’s been a move away from using hydrogen peroxide for this reason, although it is still a popular “home” remedy.

More concentrated** solutions are potentially very dangerous, causing severe skin burns. Hydrogen peroxide is also well-known for its tendency to react violently with other chemicals, meaning that it must be stored, and handled, very carefully.

All of which makes the idea of injecting into someone’s veins particularly horrific.

But this is exactly what some naturopaths are recommending, and even doing. The idea seems to have arisen because hydrogen peroxide is known to damage cancer cells. But so will a lot of other dangerous substances – it doesn’t mean it’s a good idea to inject them. Hydrogen peroxide is produced by certain immune cells in the body, but only in a very controlled and contained way. This is definitely a case where more isn’t necessarily better.

The use of intravenous hydrogen peroxide appears to have begun in America, but it may be spreading to the UK. The website yestolife.org.uk, which claims to empower people with cancer to “make informed decisions”, states “The most common form of hydrogen peroxide therapy used by doctors calls for small amounts of 30% reagent grade hydrogen peroxide added to purified water and administered as an intravenous drip.”

30% hydrogen peroxide is really hazardous stuff. It’s terrifying that this is being recommended to vulnerable patients.

Other sites recommend inhaling or swallowing hydrogen peroxide solutions, both of which are also potentially extremely dangerous.

If anyone ever suggests a hydrogen peroxide IV, run very fast in the other direction.

In 2004 a woman called Katherine Bibeau died after receiving intravenous hydrogen peroxide treatment from James Shortt, a man from South Carolina who called himself a “longevity physician”. According to the autopsy report she died from systemic shock and DIC – the formation of blood clots in blood vessels throughout the body. When her body arrived at the morgue, she was covered in purple-black bruises.

Do I need to state the obvious? If anyone suggests injecting this stuff, run. Run very fast, in the other direction. Likewise if they suggest drinking it. It’s a really stupid idea, one that could quite literally kill you.

* As anyone who’s ever studied chemistry anywhere in my vicinity will tell you, “iron three is yellow, like wee.”

** The concentration of hydrogen peroxide is usually described in one of two ways: percentage and “vol”. Percentage works as you might expect, but vol is a little different. It came about for practical, historical reasons. As Prof. Poliakoff comments in this video, hydrogen peroxide is prone to going “flat” – leave it in the bottle for long enough and it gradually decomposes until what you actually have is a bottle of ordinary water. Particularly in the days before refrigeration (keeping it cold slows down the decomposition) a bottle might be labelled 20%, but actually contain considerably less hydrogen peroxide.

What to do? The answer was quite simple: take, say, 1 ml of hydrogen peroxide, add something which causes it to decompose really, really fast (lots of things will do this: potassium permanganate, potassium iodide, yeast, even liver) and measure the volume of oxygen given off. If your 1 ml of hydrogen peroxide produces 10 ml of oxygen, it’s 10 vol. If it produces 20, it’s 20 vol. And so on. Simple. 3% hydrogen peroxide, for the record, is about 10 vol***. Do not mix up these numbers.

*** Naturally, there are mole calculations to go with this. Of course there are. For A-level Chemists, here’s the maths (everyone else can tune out; I’m adding this little footnote because I found this information strangely hard to find):

Hydrogen peroxide decomposes as shown in this equation:
2H2O2 –> 2H2O + O2

Let’s imagine we decompose 1 ml of hydrogen peroxide and obtain 10 mls of oxygen.

Assuming the oxygen gas occupies 24 dm3 (litres), or 24000 mls, at standard temperature and pressure, 10 mls of oxygen is 10 / 24000 = 0.0004167 moles. But, according to the equation, we need two molecules of hydrogen peroxide to make one molecule of oxygen, so we need to multiply this number by two, giving us 0.0008333 moles.

To get the concentration of the hydrogen peroxide in the more familar (to chemists, anyway) mol dm-3, just divide that number of moles by the volume of hydrogen peroxide. In other words:

0.0008333 mols / 0.001 dm3 = 0.833 mol dm-3

If you really want to convert this into a percentage by mass (you can see why people stick with “vol” now, right?), then:

0.833 mol (in the litre of water) x 34 g mol-1 (the molecular mass of H2O2)
= 28.32 g (in 1000 g of water)

Finally, (28.32 / 1000) x 100 = 2.8% or, rounding up, 3%

In summary (phew):
10 vol hydrogen peroxide = 0.83 mol dm-3 = 3%

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23 thoughts on “Hydrogen peroxide: another deadly alternative?

  1. I once swallowed the wrong medication, and not knowing what to do immediately, my husband told me to swallow some Hydrogen Peroxide which he thought would cause me to throw up. He said that his family had done this in the past with a pet to cause the dog to regurgitate something it had eaten. Having no time to spare to question this knowledge, I did as he proposed, but I did not throw up. I did not feel well, so I read the label and it stated something about how swallowing Hydrogen Peroxide is potentially fatal. I will never do anything against my better judgement again, but I am curious if it did any permanent damage.


    • Yikes! Yes, definitely not recommended! It sounds like you were lucky. You really should’ve gone to an emergency centre.


    • Permanent damage (scarring) is not likely, unless tissues were badly damaged — but that would probably have felt far worse than ‘not well’. Still, I’d ask a doctor to be on the safe side.
      And the recommended method for making humans throw up instantly is simply the good old index finger down the throat. Non-toxic and very safe (mind sharp fingernails though).

      Liked by 1 person

      • Absolutely – I can never stress this enough: always seek the advice of properly qualified medical doctor (which I am not).


  2. To clarify: Swallowing 3% hydrogen peroxide may cause vomiting because it irritates the stomach, but it is certainly not deadly. The high concentration “food grade” H2O2 easily causes gas emboli by any route of exposure and is absolutely to be avoided. Most “alternative” treatments involve starting with 30% or higher concentration and then diluting it to 3% or even less, so besides being ineffective it’s also nonsensical! (And of course administering any concentration by IV is ridiculous.)


    • You’re right that 3% is unlikely to be fatal if swallowed, BUT that doesn’t mean you should experiment. It’s definitely harmful and you never know what other conditions someone might have that could put them at particular risk. Plus, it could interact with the “wrong” medication that had been swallowed (re: Nicole’s post) and cause yet more problems. No one should EVER drink hydrogen peroxide, regardless of concentration.


      • Agree there’s no reason intentionally drink hydrogen peroxide at any concentration, but please — 3% H2O2 isn’t “definitely harmful.” As a CSPI (certified specialist in poison information) I spent years dealing with hydrogen peroxide ingestions, which usually occur when someone mistakes it for their water bottle. In 11 years I never encountered a single case of tissue injury or interaction with anything already in the stomach. Higher concentrations are dangerous and ingestion can be catastrophic — but the 3% concentration is upsetting to the stomach and that’s pretty much it; that’s why vets use it to induce vomiting in dogs. Again, not suggesting anyone should intentionally drink it as there is zero benefit in doing so, but there’s no need to panic over it, either.

        Liked by 1 person

    • It just adds that risk of mishandling or container explosion. Because we can’t have enough danger in our idiotic alternative therapy.

      Liked by 1 person

  3. A hydrogen peroxide IV drip may be insane, but at least that’s not something that people can easily do at home (and it also engenders the ludicrous idea that one would be trying to shift blood stains from inside the body…).
    Rather more dangerous and irresponsible in my opinion are the countless horrible ‘health awareness’ websites such as this one, recommending DIY hydrogen peroxide enemas, for crying out loud (and yes, this is a joke, albeit a rather stupid and painful one). I can’t even begin to describe the colossal stupidity of what is said there… Already advising laypeople to start with 35% industrial grade hydrogen peroxide is really, really asking for accidents. Get the dilution wrong, and you’re dead. Period.

    I’m not one for censorship, but websites like that should be shut down by order, as they incite people to do things that can (and will) seriously hurt and even kill them.


    • Yes. The problem is that there just aren’t the resources to chase down every one of these people, plus sometimes they’re based in different countries which allows them to skirt laws put in place to protect people. Sadly, they often don’t get into trouble until someone dies. However, I have had a few messages from people saying things like “my [relative/friend/etc] was considering this treatment, and I sent them to your website and it convinced them not to” and I can only hope that those few actually means that there are fair number who don’t bother to message me. That’s why I’m here 🙂


      • I know, it is virtually(!) impossible to eradicate even the most egregiously harmful nonsense(*) that is spread through the Internet. And indeed, that is why blogs like yours are so vitally important — because without sensible people like you taking time and trouble to address these issues, quacks and tinfoil hats would gain even more credibility through sheer presence in numbers and the fact that nobody contradicts them.

        *: At least you have the Cancer Act 1939 in the UK, more or less prohibiting spreading false information about (treatment of) cancer. I can’t tell if it is really effective, though…

        Liked by 1 person

      • The Cancer Act gets trotted out occasionally, but I have the impression that it’s a bit of a lumbering thing that hasn’t really caught up with the nimbleness of internet information.


  4. On a similar note, I’ve recently seen some things on Twitter about quacks recommending intravenous hydrochloric acid for a variety of ailments. I really struggle to believe *anybody* is stupid enough to think that might be a good idea…


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  6. “Water, as we know, is pretty innocuous. You should try not to inhale it obviously”

    No, not obviously – do you hold your breath whilst having a shower, as I am certain there will be water vapour in the shower!

    What you mean is don’t take in liquid water into the lungs, which is not the same as inhaling water [vapour]. The former will kill you by drowning, the latter being harmless or even beneficial to asthmatics.


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