Hydrogen water tablets vs bottle: which has more hydrogen?

The short answer

Nobody has tested the two side by side, so neither has been shown to win. The one published bottle test measured 444 to 479 ppb of dissolved hydrogen [1]. Tablets are sold on a printed maximum, ours says up to 1600 ppb, and that is a best case for your glass, not a guarantee.

A clear glass of sparkling water on a cobalt blue surface, with hard sunlight casting a long shadow — One glass, one number on the label. What the glass holds depends on how and when you measure it.

How does a hydrogen water bottle make hydrogen?

A hydrogen water bottle uses electrolysis. An electric current runs through the water between two electrodes, hydrogen gas forms at one of them, and part of that gas dissolves before it reaches the surface. In the one test we found, a run took 10 to 30 minutes [1].

That test used a direct-current bottle holding 330 mL of tap water. It reached 444 micrograms of hydrogen per litre after 10 minutes and 479 micrograms per litre after 30 minutes [1]. A microgram per litre is the same as one part per billion, so those results read as 444 ppb and 479 ppb. Tripling the run time added 35 ppb.

How does a hydrogen tablet make hydrogen?

A hydrogen tablet uses a chemical reaction, with no power and no electrodes. Magnesium in the tablet reacts with an acid as it dissolves, and that reaction releases hydrogen gas into the water. All of it happens in the glass while the tablet fizzes, so the tablet makes one dose at a time.

How completely that reaction runs depends on the recipe. A 2021 study compared magnesium effervescent tablets made with different fillers. Mannitol gave by far the fastest hydrogen release, and only the mannitol batches reacted completely [4]. A tablet does not automatically release all the hydrogen its magnesium could give.

Which method reaches the higher hydrogen level?

No published study answers this. We found none that tests a tablet and a bottle in the same water, in the same glass, at the same moment. Any brand that names a clear winner is comparing its own number with someone else's, measured differently. That goes for us too.

What you can compare is each method against the amount of hydrogen that water can normally hold. From the Henry's law constant for hydrogen, we calculate about 1.57 mg per kg of water at 25 degrees C under 1 bar of pure hydrogen, roughly 1.6 ppm or 1600 ppb [2]. The tested bottle reached less than a third of that [1]. A tablet labelled up to 1600 ppb names that same level as its best case.

Close-up of small gas bubbles rising through clear blue water — Hydrogen is the smallest gas molecule there is, and it does not stay in open water for long.

Can water hold more than 1.6 ppm?

Yes, while it stays under pressure. In a laboratory test, sealed pressure-resistant 500 mL bottles held 7.13 ppm after 24 hours with one preparation method and 10.08 ppm with another [3]. Water above about 1.6 ppm is supersaturated, so it gives up the excess once it is open to the air.

Keep that in mind when you see a very high number on a bottle or tablet. Ask where it was measured. A figure from a sealed container says little about an open glass, because the air above your water holds almost no hydrogen and the gas keeps moving towards it.

How fast does hydrogen leave the water?

Fast enough that timing matters. In the same laboratory test, the hydrogen level was significantly lower one hour after the cap came off and lower again after two hours, and the authors advised drinking within two hours of opening [3]. Unopened, the same bottles kept their level for at least 7 days [3].

Those bottles started far above what an open glass can hold, and we found no published measurement of how fast a tablet's hydrogen leaves a glass. Our advice stays the simple one: drink it straight away.

Hydrogen also passes through the body quickly. In a small study, breath hydrogen peaked at around 40 ppm 10 to 15 minutes after drinking hydrogen water, then fell rapidly back to baseline [5].

What do ppm numbers on a label leave out?

A ppm figure only means something alongside four conditions: the volume of water, the temperature, whether the container was closed, and how long after making the water it was measured. Labels rarely print all four, so two numbers on two products are often not comparable.

Volume. The same amount of hydrogen gives a higher ppm in 200 mL than in 500 mL.
Temperature. Hydrogen dissolves slightly better in cooler water [2].
Closure. A sealed container keeps the gas in, and an open one lets it go [3].
Time. A reading is true at the moment it was taken, and the level only falls after that [3].

Our own tablet has the same gap. The wording is up to 1600 ppb per glass, and the instructions allow 200 to 500 mL of water. So 1600 ppb is the top of a range, and a larger glass will read lower.

What else ends up in the water?

Each route changes the water in its own way. A bottle works on whatever is in your tap water, so chlorine levels can shift, while a tablet adds minerals. Neither result tells you how much hydrogen is present, but both are worth knowing before you choose.

In the tested bottle, free chlorine fell from 0.18 mg/L to 0.12 mg/L after 10 minutes, and dissolved ozone stayed below the detection limit of 0.05 mg/L [1]. The same paper reports chlorine in bottles from three other companies, filled to half their volume, at 0.2 to 0.35 mg/L after 10 minutes, 0.4 to 0.45 mg/L after 20 minutes and 0.5 to 1.0 mg/L after 30 minutes [1]. All of these stay under the WHO guideline of 5 mg/L the authors use, and they show that one bottle's result does not cover every bottle [1].

A tablet adds what it is made of. Each of our tablets contains 80 mg of magnesium (21 percent of the nutrient reference value), 16 mg of potassium and 41 mg of sodium. Magnesium contributes to electrolyte balance. Magnesium contributes to a reduction of tiredness and fatigue [8]. Those claims belong to the magnesium and say nothing about the hydrogen.

How do tablets and a bottle compare?

Side by side, the two routes differ in how they work and in what stands behind their number. The bottle has one published measurement, and the tablet has a printed maximum. The last row is the one to remember: the direct test has not been published.

Question	Hydrogen water bottle	Hydrogen tablet
How is the hydrogen made?	Electrolysis with an electric current	Magnesium reacting with an acid
What number stands behind it?	444 to 479 ppb measured in one bottle [1]	Up to 1600 ppb printed on ours as a maximum
What can water normally hold?	About 1600 ppb by calculation [2]	About 1600 ppb by calculation [2]
What limits the result?	Run time and the design of the bottle [1]	The recipe and the amount of water [4]
What else changes in the water?	Chlorine in tap water can fall or rise [1]	Ours adds 80 mg magnesium, 16 mg potassium and 41 mg sodium
What does it need?	Power and cleaning	A glass of water and a new tablet each time
Is there a direct comparison?	None published	None published

What does our own tablet actually promise?

Our hydrogen water tablets promise up to 1600 ppb per glass, and that is a maximum. We print no guaranteed value, because your water, your glass and your timing change the result. Each pack holds 60 effervescent tablets.

The instructions are short: dissolve 1 tablet in 200 to 500 mL of water, drink it straight away, and take no more than 2 tablets a day. If you want the highest reading a tablet can give, use the smaller amount of water and drink while it still fizzes.

A woman seen from behind drinking water at a kitchen window at dawn — Whichever route you choose, the moment you drink matters more than the number on the box.

Does hydrogen water have an EU health claim?

No. The EU has no authorised health claim for molecular hydrogen, so no brand may say that hydrogen water improves energy, recovery, skin or anything else [7]. A 2024 systematic review of 25 articles concluded that larger and more rigorous studies are still needed [6].

That is why this article compares how much hydrogen reaches your glass and leaves the rest alone. For the background, read what hydrogen water is and what the research says and how products make hydrogen water.

Frequently Asked Questions

Is a higher ppm always better?

A higher ppm means more dissolved hydrogen at the moment of measurement, and that is all it means. Compare two figures only when the volume, temperature and timing match. There is no authorised health claim for hydrogen, so a bigger number cannot promise a bigger effect [7].

Why does the tablet say up to 1600 ppb?

Because 1600 ppb is a best case. It matches the level water normally holds at room temperature [2], and the real figure in your glass depends on the recipe, the amount of water and how quickly you drink [4].

How long does hydrogen stay in the water?

In a sealed pressure-resistant bottle it held for at least 7 days. After opening, the level was significantly lower within one hour and lower again after two [3]. We found no measurement for an open glass, so drink it straight away.

Does a hydrogen bottle change the chlorine in tap water?

It can. One tested bottle lowered free chlorine from 0.18 mg/L to 0.12 mg/L, while bottles from other companies at half volume reached up to 1.0 mg/L after 30 minutes [1]. All of those values stayed below the WHO guideline of 5 mg/L [1].

Should I buy a bottle or tablets?

On hydrogen level alone, the evidence cannot settle it, because no direct comparison exists. A bottle is reusable but needs power and cleaning. A tablet needs no device, and ours also gives you 80 mg of magnesium per tablet.

The Bottom Line

No study has compared tablets and bottles directly. The one bottle tested in print reached 444 to 479 ppb [1], tablets are sold on a maximum of up to 1600 ppb, and both lose hydrogen once the water meets open air [3]. Before you buy, ask for the volume, temperature and timing behind the number. Whichever you choose, drink it straight away. Our hydrogen tablets are one way to do that, with 80 mg of magnesium per tablet on top.

This article is general information and does not replace advice from a doctor. A food supplement is not a substitute for a varied, balanced diet and a healthy lifestyle.

Hydrogen water tablets or a hydrogen water bottle: which gives you more hydrogen?