Hydrogen-rich water (tablets or saturated water), 1–2 times a day.
Meta-analysis in metabolic disorders: modest improvement in lipid profile (lowers total cholesterol and LDL).
View the study (meta-analysis) →Reduces markers of inflammation and oxidative stress in several settings; small studies.
View the study (meta-analysis) →⏱ 3 min read
Molecular hydrogen (H2) is the smallest known molecule, an odorless and tasteless gas that over the past fifteen years has gone from a chemical curiosity to one of the most active areas of translational research in anti-inflammatory and antioxidant medicine; the trigger was the 2007 publication in Nature Medicine by the Japanese group led by Ohsawa, which documented that H2 acts as a selective antioxidant, preferentially neutralizing hydroxyl and peroxynitrite radicals (the oxidative species most damaging to DNA, proteins, and cellular lipids) without affecting oxidative species with useful signaling functions (hydrogen peroxide, nitric oxide).
This antioxidant selectivity is the distinctive feature of H2 compared with other natural antioxidants: most classic antioxidants (vitamin C, vitamin E, glutathione, polyphenols) are non-selective neutralizers that can interfere with essential oxidative signaling pathways, a characteristic that probably explains why large trials of high-dose antioxidants have been disappointing for several clinical indications; H2, by contrast, seems to selectively "clean up" the most damaging oxidative species without disturbing the normal functioning of the redox system, an interesting pharmacological property.
Several small clinical trials have evaluated H2 in various inflammatory and metabolic indications: in type 2 diabetes, consumption of hydrogen-rich water (300-1,000 ml/day with H2 concentrations of 0.5-1.5 ppm) for 8-12 weeks has shown modest improvements in oxidative stress markers and, in some studies, in glycemic and lipid parameters; in metabolic syndrome, mild hypertension, and nonalcoholic fatty liver, the effects point in the same direction of modest but consistent improvements.
In athletes, several small studies have documented reductions in markers of oxidative stress, lactate, and post-exercise muscle damage with consumption of hydrogen-rich water before or during intense training; the magnitudes are modest but replicable, and position H2 as a recovery intervention with a mechanistic profile different from that of classic antioxidants.
In preclinical models of Parkinson's disease, stroke, ischemia-reperfusion injury, and head trauma, H2 has shown significant neuroprotective effects; the clinical data in humans are preliminary but consistent with the preclinical line, and several small studies in Parkinson's disease have shown modest improvements in motor scales with prolonged consumption of hydrogen-rich water.
There are several commercial ways to deliver H2 to the body: hydrogen-rich water (the most studied form, with typical concentrations of 0.5-1.5 ppm or 5-15 mg/L), inhaled gas (an experimental formulation with much higher concentrations, used in some hospital trials), and effervescent metallic magnesium tablets that release H2 as they dissolve in water; household hydrogen water generators using SPE/PEM electrolysis produce water with measurable concentrations, although they vary enormously in quality and the dissolved H2 persists for a limited time (the gas escapes quickly from the water).
The doses studied are typically 300-1,500 ml daily of hydrogen-rich water with an H2 concentration of 0.5-1.5 ppm, split into several doses throughout the day; effervescent magnesium tablets are dissolved in a glass of water and consumed immediately to capture the H2 before it dissipates; clinical effects appear gradually and require at least 8-12 weeks of regular consumption for assessment.
It is one of the supplements with an exceptional safety profile: H2 is an endogenous molecule that the body produces continuously in small amounts through fermentation by the gut microbiota, no toxicities have been described at the doses and concentrations used, and there are no known specific contraindications; people with serious illnesses should not replace effective treatments with H2 without medical supervision; commercial products vary enormously in quality and many do not contain the declared H2 concentrations, an important consideration when evaluating clinical response; in pregnancy and breastfeeding the specific data are limited, although endogenous H2 is ubiquitous and no problems have been described with consumption of hydrogen-rich water at moderate doses; clinical research is active, with preliminary data that motivate cautious optimism but do not yet allow firm clinical claims for most indications.
Information, not medical advice. Scientific evidence reflects the quality of the studies.