TLDR
Hydrogen water is ordinary drinking water with extra dissolved molecular hydrogen gas (H2). It is made by electrolysis, by magnesium tablets, or by filling under pressure. Studies in people are small and short, and the effects reported are modest. Before you buy, check the ppb figure, the cycle time and the test method.
What hydrogen water is
Hydrogen water is drinking water that holds extra hydrogen gas. The gas is molecular hydrogen, written H2. Two hydrogen atoms bond into one molecule, and it is the smallest molecule there is. You may also see it called hydrogen-rich water, H2 water or HRW.
All water already contains hydrogen atoms. That is the "H" in H2O. Hydrogen water is different because it holds loose H2 gas in the liquid, the same way soda holds carbon dioxide. Because H2 is so small, it leaves the water fast once you open the container or pour a glass.
It is also not the same as alkaline water. Alkaline water changes pH. Hydrogen water changes the dissolved gas. For the detail, read hydrogen water vs alkaline ionized water.
How hydrogen water is made
There are three common ways to put H2 in water. Each one gives a different level and a different amount of control.
| Method | How it works | What to know |
|---|---|---|
| Electrolysis (bottles and machines) | A small electric current splits water. A membrane keeps the hydrogen side apart from the oxygen side. The hydrogen dissolves into the water you will drink. | This is how a hydrogen water bottle works. Most use an SPE/PEM cell. See SPE/PEM technology and how a hydrogen water bottle works. |
| Magnesium tablets or sticks | Magnesium reacts with water (Mg + 2H2O gives Mg(OH)2 + H2) and releases hydrogen as it fizzes. | The by-product is magnesium hydroxide, which can raise alkalinity. Read tablets vs bottles. |
| Pressure filling (pouches and cans) | Hydrogen gas is pushed into water under pressure and sealed in the package. | The level is set at the factory. Once you open the package, the gas starts to leave. |
A 2026 review in the Journal of Clinical Biochemistry and Nutrition describes these same three approaches: electrolysis, the magnesium and water reaction, and gas infusion under pressure. It notes that they differ in how much hydrogen they reach and how long it stays dissolved.
If you want to try it, here is how to make hydrogen water at home.
ppb, ppm and mg/L: how hydrogen water is measured
Hydrogen level is the number that sellers lead with, so it helps to read the units.
| Unit | What it means | Converts to |
|---|---|---|
| ppm | Parts per million. For hydrogen in water it is about the same as mg/L (own arithmetic). | 1 ppm = 1 mg/L = 1,000 ppb |
| ppb | Parts per billion. Bottle makers often use it because the numbers look larger. | 1,000 ppb = 1 ppm |
| mM or mmol/L | Millimoles per liter. Many studies use this unit. | 1 mM = about 2 mg/L (own arithmetic, from 2.016 g/mol) |
Here is the catch. The 2026 review in the Journal of Clinical Biochemistry and Nutrition reports that electrolysis at normal air pressure reaches about 0.6 to 1.6 ppm. Higher readings need pressure, cold water, a sealed container or a very fast measurement. It reports up to about 3 ppm under controlled conditions.
So a bottle that claims 8,000 ppb (8 ppm) or 10,000 ppb (10 ppm) is claiming more than that review lists for open electrolysis. That does not prove the claim wrong, because a sealed or pressurized chamber can change the result. It does mean you should ask for the test method.
Our Hydrator Max page lists up to 10,000 PPB on the 10-minute cycle, and about 3,000 PPB on the 5-minute cycle. That is the maker's figure, and I link no independent dissolved-hydrogen report for it. Read is 10,000 ppb real and how to measure hydrogen concentration to see how any number gets checked, and how H2 blue drops work.
How long hydrogen water lasts
Not long. Hydrogen gas escapes from the water, and it escapes faster when the water is warm, shaken or left open. For the Hydrator Max, our guidance is to drink within 30 minutes for peak hydrogen. The product page says hydrogen stays strong for about 30 to 60 minutes.
This is why freshly made hydrogen water and long-shelf-life packaged hydrogen water are not the same product. For more detail, read how long hydrogen water lasts and whether hydrogen water bottles run out of hydrogen.
What studies report about hydrogen water
Researchers have studied molecular hydrogen since at least a 2007 paper in Nature Medicine, which tested hydrogen in cultured cells and in a rat model of brain injury. The rats inhaled the gas. That is lab and animal work, not proof that a glass of water does something in people.
Human trials of hydrogen water exist, and most are small. Here is a short summary. Each row links to a longer section in our benefits guide.
| Area | What trials report | How strong is it |
|---|---|---|
| Exercise | A double-blind crossover of 12 men found lower blood lactate at higher intensities (Botek 2019). A 12-athlete crossover found a 0.6% faster 400 m time (Sládečková 2026). | Small trials. Early. |
| Oxidative stress markers | A meta-analysis of 6 studies and 76 healthy adults found no change in d-ROMs and a small gain in antioxidant potential (Li 2024). | Mixed. |
| Blood sugar and lipids | Small randomized trials report lower cholesterol markers in some groups (Kajiyama 2008). | Early. Needs larger trials. |
| Mood and fatigue | One 26-person crossover reported a lower K6 distress score (Mizuno 2017). | Weak. |
The 2026 review in the Journal of Clinical Biochemistry and Nutrition counted 72 relevant studies: 18 in vitro, 28 in animals and 26 in humans. It lists small samples, 4 to 12 week durations and inconsistent reporting of hydrogen level as the main limits.
Read the full breakdown in hydrogen water benefits: what the research shows. For a skeptic's angle, read is hydrogen water a scam.
Is hydrogen water safe?
In the studies it reviews, the 2026 review in the Journal of Clinical Biochemistry and Nutrition reports no clinically meaningful change in liver, kidney, blood or ECG markers over 4 to 12 weeks. It also says long-term safety data are limited. That is a fair summary: no red flags in short trials, and little data beyond a few months.
Some people notice mild stomach changes when they start. Read hydrogen water side effects before you begin. If you take medicine or have a medical condition, ask your clinician first.
Water quality matters too. A bottle can only improve water you already trust, and a dirty chamber can hurt taste and output. See what type of water to use and whether hydrogen water tastes different.
How to choose a hydrogen water bottle
Use this checklist on any bottle, including ours.
- Cycle time with the ppb figure. A number with no cycle time cannot be compared.
- A named test method. Look for gas chromatography or a linked report. A bare claim is only a claim.
- Generator type. SPE/PEM with platinum-coated electrodes is the usual design.
- Body material. Look for a named, food-grade material.
- Cleaning. Mineral buildup is the top reason output drops, so look for a clear rinse routine or a self-clean mode.
- Honest claims. Walk away from any product that says it cures a disease.
For side-by-side tables, read our best hydrogen water bottle buying guide, the highest ppb bottles, Dr. Water vs Echo vs Piurify and Dr. Water vs Echo Go Flask. If budget leads, see choosing a bottle for your budget. For a machine instead of a bottle, see best hydrogen water machines. More general advice is in what to look for in a hydrogen water bottle and portable PEM bottles.
I make the Hydrator Max, so weigh my view accordingly. It lists a 14 oz (400 ml) body, a 4,500 mAh battery with 30+ cycles per charge, USB-C charging, a UV self-clean cycle and a touchscreen with no app or account.
How to use and care for a bottle
- Fill the chamber with cold or room-temperature filtered water.
- Skip sparkling water, alkaline water and water hotter than 120°F.
- Run the cycle you want, then drink within 30 minutes.
- Rinse the chamber about once a week with clean water and no soap. Run the UV self-clean cycle when needed.
If something goes wrong, see why a hydrogen water bottle may not work, how to use and care for your bottle, how to clean a hydrogen water bottle and hydrogen water filters.
More guides to read next
- H2 molecular hydrogen tablets: benefits and side effects
- Hydrogen tablets vs hydrogen water bottles
- Kangen water vs hydrogen water
- The best time to drink hydrogen water
- Hydrogen water and acid reflux
- Hydrogen water health effects: myth or reality
A hydrogen number without a cycle time and a test method is a claim, not a measurement.
FAQ
What is hydrogen water?
Hydrogen water is drinking water with extra dissolved molecular hydrogen gas (H2). It is made by electrolysis, by magnesium tablets or by pressure filling. It differs from alkaline water, which changes pH rather than adding gas.
What does hydrogen water do?
Small human trials report modest effects, such as lower blood lactate during hard exercise and a small rise in antioxidant potential. Evidence is early and trials are short. It is not a treatment for any disease.
Is hydrogen water worth it?
It is a personal call. The research is early, so treat it as an optional add-on to good hydration. Judge it over several weeks, and pick a product that states its ppb figure with a cycle time and a test method.
What is the difference between hydrogen water and regular water?
Hydrogen water holds extra dissolved H2 gas. Regular water holds almost none. The extra gas leaves the water within about 30 to 60 minutes, so freshly made water is the usual approach.
What is a hydrogen water bottle?
A hydrogen water bottle is a portable device that uses electrolysis, usually through an SPE/PEM cell, to dissolve hydrogen into the water you drink. You choose a cycle, wait, then drink.
How many ppb of hydrogen water is good?
No official target exists. Trials used different levels, from about 0.9 ppm to higher. A 2026 review puts open electrolysis at about 0.6 to 1.6 ppm, so ask any maker how a higher number was measured.
Is hydrogen water safe to drink every day?
Studies of 4 to 12 weeks found no clinically meaningful changes in liver, kidney, blood or ECG markers. Long-term data are limited. Ask your clinician if you take medicine or have a condition.
Can I make hydrogen water at home?
Yes. You can use a hydrogen water bottle, a machine or magnesium tablets. Use clean filtered water, drink soon after, and keep the equipment clean.
Are hydrogen tablets the same as hydrogen water?
Tablets are one way to make it. They release hydrogen as magnesium reacts with water, and the level depends on the tablet and the water. A bottle makes it with electricity instead.
Does hydrogen water taste different?
Hydrogen gas has no taste of its own. Any taste difference usually comes from the water or from how clean the chamber is.
If you want to read the Hydrator Max specs exactly as we list them, see the Hydrator Max product page.
