Hydrogen water: is it healthy? Effects, experiences and criticism

Hydrogen water has increasingly moved into the focus of athletes, health-conscious consumers and researchers in recent years. Already widespread in Asia, hydrogen water is also growing in popularity in Europe. But what exactly is behind it? Is hydrogen water healthy, what effects does the research suggest – and where are the limits of what we currently know?

In this guide we look at the state of the science as honestly as possible, summarise user experiences with hydrogen water and address possible side effects as well as the criticism levelled at it. We also clarify what to look out for if you want to buy hydrogen water or are interested in a comparison of hydrogen water devices.

The question of whether hydrogen water is healthy cannot be answered with a simple yes or no. Research into molecular hydrogen is active and growing – more than 3,000 scientific publications now address the topic. At the same time, the evidence in many areas is still preliminary: some studies are small, run over short periods or were conducted in animal models. Large-scale, independent long-term studies in humans are only just emerging.

You will find a curated overview of the most important publications on this study page on molecular hydrogen. The following areas are considered particularly promising.

Looking at users’ experiences with hydrogen water, many report a subjectively increased energy level, a perceived faster recovery after exercise and a general sense of well-being. Such reports are valuable as initial orientation, but they are by their nature subjective and not equivalent to clinical studies. You will find genuine user reports on this testimonials page.

A frequently asked question concerns possible side effects of hydrogen water. According to the current state of research, molecular hydrogen is considered well tolerated. Since hydrogen is a natural gas that is also produced in small amounts by gut bacteria, the body is fundamentally familiar with it.

In the clinical studies conducted in humans to date, no undesirable side effects have been documented for the oral intake of hydrogen water [2]. Excess hydrogen is generally exhaled via the lungs. Common questions on safety and use are answered in this FAQ on hydrogen water.

Despite the interesting body of studies, there is legitimate criticism of hydrogen water that should be taken seriously:

1. No conclusive evidence yet: There are already more than 3,000 studies and publications on the topic of hydrogen. Systematic reviews such as Dhillon et al. (2024) confirm the antioxidant properties, but at the same time emphasise that large-scale, independent long-term studies in humans are still outstanding. The research is promising and is set to continue in the future.

2. The volatility of the gas: Molecular hydrogen is the smallest molecule in nature and escapes very quickly from unsuitable containers, particularly from conventional PET plastic bottles. Criticism of hydrogen water therefore often targets products where it is unclear how much H₂ is actually still dissolved in the water at the moment of drinking.

If you want to buy hydrogen water, you face three fundamentally different routes today: electrolysis devices, hydrogen tablets and ready-to-drink hydrogen water. Each option has specific characteristics – and the differences in purity, concentration and handling are considerable. A direct product comparison is provided on this comparison page of the various options.

If you are looking for a comparison of hydrogen water devices, you will mainly come across hydrogen drinking bottles and stationary ionisers that enrich water with hydrogen by electrolysis. A good comparison of hydrogen water devices should take the following criteria into account:

• PEM/SPE technology: High-quality devices use a proton exchange membrane (PEM) and solid polymer electrolyte (SPE) technology in order to separate out by-products such as ozone or chlorine as far as possible.

• H₂ concentration: Performance is stated in ppm (parts per million). Good devices reach values between 1.0 and 3.0 ppm of dissolved hydrogen.

• Material quality: Containers should be made of glass or stainless steel, since hydrogen molecules can escape through common plastics such as PET.

One disadvantage of electrolysis is that by-products can be created alongside hydrogen during the splitting process. With devices using high-quality PEM/SPE technology this risk is reduced, but it cannot be ruled out entirely. You will find the detailed comparison here: Hydrogen water vs. H₂ generators.

Another possibility is hydrogen tablets (H₂ tablets), which you drop into a glass of water, where they release molecular hydrogen through a chemical reaction. This option is compact and practical for travelling. However, the H₂ concentration actually achieved depends heavily on product quality, water temperature and reaction time. The tablets also contain carrier substances such as elemental magnesium or binders, which remain in the water as residues. More on this in the direct comparison: Hydrogen water vs. H₂ effervescent tablets.

A practical alternative to devices and tablets is offered by AWAKE – Europe’s first ready-to-drink hydrogen water. Here molecular hydrogen is introduced directly into the water under controlled conditions without electrolysis and sealed in gas-tight aluminium cans and glass bottles. Both packaging formats keep the small hydrogen molecules stable until opening – something that would not be possible with conventional PET plastic containers.

The concept has three practical advantages over the other options:

Controlled production without by-products: Since no electrolysis process takes place, no by-products such as ozone or chlorine are created. The AWAKE can – refined with a natural lemon-lime flavour – and the AWAKE bottle contain nothing but water and molecular hydrogen.

High and stable concentration: AWAKE states a concentration of 11 ppm – considerably more than the typical yield of home devices (1.0–3.0 ppm).

Ready to drink immediately: No charging, no waiting, no maintenance. AWAKE can be integrated into your daily routine without any fuss – particularly if you have neither the time nor the inclination for hydrogen devices.

If you want to buy hydrogen water without having to deal with hydrogen devices or hydrogen tablets, AWAKE is a practical option that is clean on the production side.

Research into hydrogen water is active and provides interesting first indications – particularly in the areas of oxidative stress, athletic recovery and inflammation modulation. As things currently stand, no side effects of hydrogen water are known.

If you are interested in hydrogen water, you should soberly compare the three available options – electrolysis devices, tablets and ready-to-drink water. Each has its merits; the differences lie above all in purity, concentration, handling and effort.

AWAKE offers a practical ready-to-drink form with controlled production, a high concentration and without the effort of a device or the residues of a tablet – available as a can and as a glass bottle. Whether hydrogen water is right for your daily routine ultimately remains a personal decision – ideally based on your own research and, if in doubt, in consultation with a doctor.