H2Tab
H2Tab molecular hydrogen tablets in unflavoured, raspberry and lemon-lime, plus bath tablets. We explain how the magnesium reaction works, how much one tablet gives you and how to drink it before the gas escapes.Read more →
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How H2Tab hydrogen tablets work in your glass
H2Tab makes one thing: tablets that turn still water into hydrogen-rich water. Each tablet is built around elemental magnesium, combined with three fruit acids: malic acid from apples, tartaric acid from grapes and adipic acid from sugar beets. In water those acids break the magnesium down, and that reaction releases hydrogen gas as very small bubbles.
The practical side matters more than the chemistry. Drop one tablet into 350 to 500 ml of still, room-temperature water and give it about 90 to 120 seconds. The water clouds while the reaction runs, then clears again. Drink it soon after, because hydrogen is a gas and leaves the glass over time. Ice-cold water slows the reaction, and hot water holds less gas. Do not screw a bottle shut while a tablet is still fizzing.
What one tablet actually gives you
H2Tab states up to 12 ppm of dissolved hydrogen per tablet, which is at the higher end for this format. Each tablet also delivers 80 mg of elemental magnesium, and you swallow that with the water. Magnesium contributes to the reduction of tiredness and fatigue. If you already use a daily magnesium supplement, add the two together rather than treating the tablet as free.
Now the honest part. There is no approved European health claim for molecular hydrogen itself, so we do not make one. Research on hydrogen-rich water exists and is growing, but it is early, and most of it is small. What we can say without stretching anything is what the magnesium in the tablet does, and what the format does: it gives you hydrogen-rich water without a machine, a bottle or a plug socket. People who use it daily tend to do so around training or in the morning; it contains no caffeine and no sugar.
Choosing between the versions
The range is simple. Unflavoured suits anyone who wants to keep the taste of their water, or who stirs the tablet into another still drink. Raspberry and lemon-lime are lightly sweetened with blackberry leaf extract, which adds no calories. The bath tablets are a separate product with a separate purpose and are not for drinking. If you like the format itself, our wider range of effervescent tablets covers other nutrients in the same drop-and-dissolve style.
Why we carry H2Tab
We looked at this category and chose the tablet route over hydrogen machines, because the dose is consistent and you can check what is in it. Within tablets, we prefer a short, readable ingredient list: elemental magnesium plus fruit acids, no dyes, no artificial additives. We stock the unflavoured version deliberately, since it is the one people ask for when they mix it into something else. We do not repeat the brand's benefit language, because the claims behind it are not approved here. What we do check is the label, the compliance file and the batch, in-house and through independent labs. If that reasoning interests you, read how we select brands and products.
H2Tab suits you if you want an easy daily ritual and are comfortable with an ingredient whose long-term evidence is still being built. It suits you less if you want a supplement with a firm, approved benefit behind it. In that case a targeted product from our recovery and hydration range is the more solid starting point.
Frequently asked questions
They are effervescent tablets that you drop into still water instead of swallowing. Each tablet contains elemental magnesium plus malic, tartaric and adipic acid. In water, the acids break down the magnesium and hydrogen gas is released into the glass, which is why the water goes cloudy. You drink the water, not the tablet. H2Tab is a brand founded around this single format, sold in unflavoured, raspberry and lemon-lime, plus a separate bath tablet.
Drop one tablet into roughly 350 to 500 ml of still, room-temperature water and let it dissolve fully, which takes about 90 to 120 seconds. Drink it shortly after the fizzing stops, because hydrogen is a gas and gradually leaves the water. Use a glass or an open bottle: do not seal a bottle tightly while the reaction is running. If you prefer it cold, add ice after the tablet has dissolved.
All three drinking versions use the same magnesium and acid base. The difference is taste and where you use them.
| Version | Taste | Best suited for |
|---|---|---|
| Unflavoured | Neutral | Plain water, mixing into other drinks |
| Raspberry | Light fruit | People who dislike plain water |
| Lemon-lime | Fresh, citrus | Around training |
| Bath tablet | Not for drinking | Use in the bath only |
Start with unflavoured if you are unsure, since you can always add lemon yourself.
One tablet supplies 80 mg of elemental magnesium, which you drink along with the water. Magnesium contributes to normal muscle function. That is a useful amount, but worth counting if you already take a separate magnesium product.
| Group | Daily amount |
|---|---|
| Men 19 to 64 | 300 mg |
| Women 19 to 64 | 270 mg |
| From supplements | 400 mg or less |
Source: NHS
The brand's own guidance is to start with one tablet daily and go up to two or three if you want more. Keep the magnesium in mind before you do. Three tablets means 240 mg of elemental magnesium from this source alone, on top of anything else you take. The NHS notes that 400 mg or less a day of magnesium from supplements is unlikely to cause harm, and that higher short-term doses can cause diarrhoea. Follow the label and do not exceed it.
The cloudiness is the hydrogen gas itself, suspended as very small bubbles while the tablet reacts. It is not undissolved powder and it is not a fault. Once the fizzing settles the water clears again, and from that point the gas slowly escapes into the air. That is why every instruction says to drink it promptly rather than making it in advance. Making a bottle in the morning for the afternoon defeats the purpose of the format.
Avoid carbonated water, since the carbonation interferes with the reaction. Hot drinks such as coffee or tea are also a poor match: warm liquid holds less dissolved gas. Still, cool or room-temperature drinks work, which is why the unflavoured tablet is popular with people who add it to squash, lemon water or an electrolyte drink mix. Let the tablet dissolve first, then add anything else you want.
No. Molecular hydrogen has no authorised health claim, so neither we nor any retailer may state that it does something in the body. Published research on hydrogen-rich water exists, but the studies are mostly small and the evidence is not settled. The only claim we can legitimately make about these tablets relates to their magnesium content: magnesium contributes to the reduction of tiredness and fatigue. Buy H2Tab for the format and the daily habit, and treat the hydrogen research as promising rather than proven.
If you have kidney problems, magnesium is worth discussing with your GP first, because the kidneys regulate how much stays in the body. The same applies if you take medicines that need spacing from magnesium, such as certain antibiotics or thyroid medication. If you are pregnant or breastfeeding, check with a healthcare professional before adding any new supplement. Never swallow a tablet dry: it is designed to react in water, not in your mouth.
