Understanding concentration units starts with knowing that ppm and ppb describe the same measurement on different scales.
Hydrogen water and hydrogen device labels are full of numbers — ppm, ppb, mg/L — that can make comparison shopping feel like decoding a foreign language. Here's what these units actually mean, how concentration is measured, and what to ask before you buy.
If you've spent any time comparing hydrogen water bottles, hydrogen tablets, or hydrogen inhalation machines, you've probably run into a wall of numbers — 1.8 ppm here, 1,200 ppb there, 1,600 ppb somewhere else. On the surface, these look like completely different products. In reality, they may describe the exact same amount of dissolved hydrogen, just expressed on a different scale. Understanding that scale is the single most useful thing you can do before spending money on a hydrogen product of any kind.
Both ppm (parts per million) and ppb (parts per billion) are units of concentration — they describe how much of a substance, in this case dissolved molecular hydrogen (H₂), exists within a much larger quantity of something else, in this case water. Neither unit tells you anything by itself about quality, safety, or effectiveness. They are simply different-sized rulers measuring the same thing.
Think of it the way you'd think about distance in inches versus miles. A hallway that is 240 inches long and a hallway that is 0.00379 miles long are the same hallway. Nobody would assume the version measured in inches is "more hallway." Hydrogen concentration works the same way: ppb is just a finer-grained ruler than ppm, so the numbers on it are naturally larger.
Hydrogen water marketing has grown quickly, and not every brand uses the same unit or the same testing standard when reporting concentration. One company might advertise "1,600 ppb of molecular hydrogen" while a competitor advertises "1.6 ppm." These are identical claims dressed in different clothing. Because ppb numbers look larger at first glance, some marketing leans on ppb specifically because the bigger digits read as more impressive, even when the underlying concentration is unremarkable or even lower than a competing ppm-labeled product.
This isn't necessarily dishonest — ppb is a legitimate scientific unit — but it does mean the burden falls on the consumer to do a quick mental conversion before deciding which product actually delivers more dissolved hydrogen.
The conversion is simple division by 1,000:
Once every product is converted to the same unit, comparison becomes straightforward. If one hydrogen water bottle lists 1,200 ppb (1.2 ppm) and another lists 1.8 ppm directly, the second product is delivering more dissolved hydrogen per liter — a meaningfully different comparison than "1,200 versus 1.8" would suggest at a glance.
Concentration is an important number, but it's not the whole picture. A few other variables shape how much dissolved hydrogen actually reaches you:
Curious how hydrogen concentration compares across different delivery methods? Read Hydrogen Water vs. Hydrogen Inhalation.
None of this means concentration figures are meaningless — it means they should be read alongside context, not in isolation.
There are three tools commonly used to measure dissolved molecular hydrogen in water, ranked roughly from simplest to most rigorous:
Gas chromatography sounds intimidating, but the underlying idea is fairly intuitive. A water sample is treated so that any dissolved gas — including molecular hydrogen — is released and carried through a long, narrow column inside the instrument by an inert carrier gas. Different gases move through that column at different speeds based on their physical properties. A detector at the end of the column measures exactly when each gas exits and how much of it there is, producing a precise, quantified reading of hydrogen concentration.
Because it isolates and measures hydrogen directly rather than estimating it through a color reaction or an electronic proxy, gas chromatography is considered the most accurate and most trusted method for verifying hydrogen concentration claims — which is why it's the method most often used in independent lab certification.
A manufacturer's own stated concentration is a claim. Third-party testing is verification of that claim by a lab with no financial stake in the outcome, typically using gas chromatography. Some organizations in the hydrogen water space, such as the International Hydrogen Standards Association (IHSA), have begun offering certification specifically for hydrogen water products tested this way.
Not every hydrogen product on the market currently carries this kind of third-party certification, and its absence doesn't automatically mean a product underperforms — but its presence does give consumers an independent data point beyond a company's own marketing copy.
Before choosing a hydrogen water product, device, or in-studio service, it's worth asking:
Asking these questions turns a confusing wall of numbers into a genuinely useful comparison — and helps you evaluate any hydrogen product, whether it's ours or someone else's, with a clearer eye. For clients specifically comparing hydrogen alongside other recovery-focused modalities, our companion piece on recovery science and stacking modalities looks at how hydrogen therapy is commonly combined with other services in a broader wellness routine.
A ppb number is automatically more impressive than a ppm number because it's bigger.
Ppb is simply a smaller unit of measurement than ppm — 1,000 ppb equals 1 ppm. The size of the number reflects the unit, not the amount of hydrogen.
Once a concentration figure is printed on a label, it stays accurate indefinitely.
Dissolved hydrogen off-gasses over time, especially in open containers or standard plastic packaging, so a label figure best reflects concentration at the moment of testing — not necessarily at the moment of use.
Yes. One ppm equals 1,000 ppb, so 1,200 ppb converts to 1.2 ppm. The two units describe the same dissolved hydrogen concentration on different scales, and a label using ppb will always show a numerically larger figure than the equivalent ppm reading.
Not necessarily. A product listing 1,200 ppb and a product listing 1.2 ppm contain the identical amount of dissolved hydrogen. The larger-looking number is a unit-scale effect, not evidence of a stronger product. Always convert to a single common unit before comparing two items.
Dissolved hydrogen is most commonly measured with a hydrogen-specific drop reagent test, a portable dissolved hydrogen (DH) meter, or laboratory-grade gas chromatography. Drop reagent kits and DH meters are practical for in-studio or at-home spot checks; gas chromatography is the more rigorous method used in formal lab testing and third-party certification.
Dissolved hydrogen is unstable and off-gasses from water quickly, especially in an open container or warm environment. A reading taken immediately at the point of production will differ from a reading taken minutes later, so the testing method and the timing of the test both affect the number a manufacturer can honestly claim.
Third-party certification means an independent lab, rather than the manufacturer itself, has verified a product's dissolved hydrogen output using standardized testing equipment such as gas chromatography. It adds a layer of verification beyond a company's own marketing claims, though not every hydrogen product on the market currently carries this kind of independent certification.
For clients incorporating hydrogen inhalation into a broader wellness routine, the All-Access Wellness Membership ($249/month) includes access to hydrogen therapy alongside our other recovery modalities. See our membership options for details.
H₂ Inhalation · Fresh H₂ Water $8/18oz bottle · In-studio at 200 Middle Neck Rd, Great Neck, NY.
Book Your Session ↗Serving Great Neck, Manhasset, Roslyn, Port Washington, New Hyde Park, Lake Success, Little Neck, Bayside, and surrounding Long Island communities.