Evidence by topic

How has drinking hydrogen rich water been studied in metabolism?

23 papers: 12 human studies, 4 reviews and 7 animal or cell studies from 2024 onward.

All returned Europe PMC MED and PMC title and abstract records were checked. Human studies have no lower publication year limit through 29 October 2026; animal and cell studies are limited to 2024 onward. Reviews are grouped separately from primary studies. This is an abstract screened inventory, not a systematic review guaranteeing all relevant literature. Each group is sorted by first publication date, newest first.

Checked 2026-10-29 · 79 records searched

Randomized human studies9

  1. 36 adults with obesity were randomized under double blinding to one liter daily of hydrogen rich water or control water for eight weeks; appetite, body composition, sleep, circulating GLP-1 and lipids were measured.

    Medicina (Kaunas) · 2025 · PMID 40731927

  2. 181 adults with metabolic or premetabolic syndrome entered a double blind randomized comparison of electrolyzed hydrogen water and filtered water for three months; waist circumference, glucose, oxidative markers and physical activity subgroups were assessed.

    Antioxidants (Basel) · 2024 · PMID 38397743

  3. 73 people with impaired fasting glucose were randomized to one liter daily of hydrogen rich water or plain water for eight weeks. Metabolism and gut microbiota were measured; fatty liver subgroups comprised 16 hydrogen water and 19 control participants.

    Antioxidants (Basel) · 2023 · PMID 37371975

  4. 30 people with fatty liver were randomized under double blinding to hydrogen rich water or placebo for eight weeks; weight, liver enzymes, lipids and blood biomarkers were measured.

    Antioxidants (Basel) · 2022 · PMID 36290657

  5. 40 adults aged at least 70 were randomized to 0.5 liters daily of hydrogen rich water or control water for six months; protein and lipid metabolism, body composition, brain metabolism and other aging markers were assessed.

    Exp Gerontol · 2021 · PMID 34601077

  6. 50 people with type 2 diabetes were randomized to electrolyzed hydrogen water or filtered water in a multicenter double blind study; insulin resistance, glucose, lactate and oxidative markers were assessed. Duration is not stated in the abstract.

    Diabetol Int · 2021 · PMID 35059257

  7. 60 adults with metabolic syndrome were randomized under double blinding to high concentration hydrogen rich water or placebo for 24 weeks; body composition, glucose, lipids and inflammatory markers were measured.

    Diabetes Metab Syndr Obes · 2020 · PMID 32273740

  8. 12 overweight people with fatty liver entered a double blind crossover trial of one liter daily of hydrogen rich water or placebo for 28 days; MRI liver fat, body composition and laboratory measurements were compared.

    Clin Res Hepatol Gastroenterol · 2019 · PMID 30982748

  9. 30 people with type 2 diabetes and six with impaired glucose tolerance entered a double blind crossover study of 900 mL daily of hydrogen rich water or placebo for eight weeks per period, separated by a 12 week washout; glucose, insulin resistance and lipids were measured.

    Nutr Res · 2008 · PMID 19083400

Human studies without a control group3

  1. Nine adults with diabetes related blood markers outside reference ranges drank 1.5 liters daily of hydrogen water prepared by alternating current electrolysis for eight weeks; glucose, fructosamine and urinary oxidative markers were measured without a control group.

    Med Gas Res · 2020 · PMID 33004708

  2. 20 patients with potential metabolic syndrome drank 0.9 to one liter daily of hydrogen rich water for ten weeks; lipoprotein composition and function and blood oxidative markers were measured before and after. A control group is not described in the abstract.

    J Lipid Res · 2013 · PMID 23610159

  3. 20 adults with potential metabolic syndrome drank 1.5 to 2 liters daily of hydrogen water prepared using a magnesium stick for eight weeks; glucose, lipids and oxidative markers were compared before and after in an open label study.

    J Clin Biochem Nutr · 2010 · PMID 20216947

Reviews, systematic reviews and meta analyses4

  1. A systematic review and meta analysis of hydrogen rich water and blood lipids in overweight or obese adults, searched through November 2025, covering 12 articles, 13 randomized trials and 757 participants.

    Diabetol Metab Syndr · 2026 · PMID 41888952

  2. A review of oral hydrogen rich water research, describing glucose and lipid metabolism measurements and other research methods. The abstract does not state an included study count.

    Curr Pharm Des · 2025 · PMID 39810534

  3. A systematic review and meta analysis of eight randomized trials with 357 participants examining hydrogen rich water and lipids in metabolic disorders, searched through January 2024.

    Int J Endocrinol Metab · 2024 · PMID 39839806

  4. A systematic review and meta analysis of seven studies on hydrogen rich water and lipid or lipoprotein profiles in clinical populations, searched through 4 October 2022.

    Pharmaceuticals (Basel) · 2023 · PMID 37259294

Animal and cell studies from 20247

  1. Rats with streptozotocin induced diabetes received hydrogen rich water for 24 weeks; glucose, body weight, multiple organ histology and gene expression were analyzed. Animal count is not stated in the abstract.

    Transl Androl Urol · 2025 · PMID 40687659

  2. Mice with high dose steroid induced osteonecrosis received hydrogen rich water; circulating lipids, bone tissue, vessels and macrophage metabolic pathways were examined. Animal count is not stated in the abstract.

    Biomaterials · 2025 · PMID 40411985

  3. 30 male rats were assigned to normal diet, high fat diet, or high fat diet plus oral hydrogen rich water for 16 weeks; weight, reproductive hormones and testicular tissue were assessed.

    Toxicol Appl Pharmacol · 2025 · PMID 40188972

  4. ApoE deficient mice with dyslipidemia and induced psoriasis like skin inflammation received hydrogen rich water; circulating lipids, skin inflammation and gene expression were analyzed. Animal count is not stated in the abstract.

    Eur J Pharmacol · 2025 · PMID 39923825

  5. 12 mice with type 2 diabetes were assigned to hydrogen rich water or control water, six per group, from six weeks of age; weight, glucose, blood pressure and retinal blood flow were measured through 14 weeks of age.

    Transl Vis Sci Technol · 2024 · PMID 39446362

  6. HepG2 cells exposed to free fatty acids received hydrogen rich water; lipid droplets, oxidative stress and AMPK signaling were measured. Replicate count is not stated in the abstract.

    Biomedicines · 2024 · PMID 39062020

  7. Of 23 pregnant goats, ten received hydrogen rich water for 21 days before and after delivery and 13 served as controls; glucose and lipids were measured weekly and offspring growth was recorded.

    Res Vet Sci · 2024 · PMID 38458045

Excluded 56 of 79 records: 7 Other topic, hypothesis or broad review without a separately described hydrogen water metabolic evidence set; 6 Rearing water, cell medium, local application, bathing, capsules or inhalation rather than drinking; 4 Toxicity, brain injury or stress experiment outside the metabolic disease scope; 23 Animal or cell research before 2024; 16 Plant, microbial or physical study outside human metabolic and animal disease research.

View the search query

TITLE_ABS:("hydrogen rich water" OR "hydrogen-rich water" OR "hydrogen water") AND TITLE_ABS:(diabet* OR "metabolic syndrome" OR glucose OR lipid* OR obesity) AND (SRC:MED OR SRC:PMC) AND FIRST_PDATE:[* TO 2026-10-29]

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Frequently asked questions

Does this page include hydrogen inhalation studies?

No. Human studies concern drinking hydrogen rich water. Recent animal intake and a related cell experiment are grouped separately; inhalation, bathing and oral capsules are excluded.

Which measurements were recorded?

Measurements included glucose, insulin resistance, circulating lipids, body weight and waist circumference. Participant conditions, intake amounts and observation periods vary by study.

Which years and how many papers are included?

There are 12 human papers without a lower year limit and 7 animal or cell papers from 2024 onward. The 4 review papers are shown separately.