Is Hydrogen Water Good for Your Kidneys? What Research Shows

Hydrogen Studies is funded by Echo Technologies LLC, which sells hydrogen water products. Echo doesn't decide which studies we cover or how we describe them — see our editorial policy.

Short answer: There is no good evidence that drinking hydrogen water protects, improves or restores kidney function in people. Most of the human kidney research tested hydrogen added to dialysis fluid, not drinking water, in studies from Japan that were mostly small or not randomized. Research on drinking hydrogen water for kidney health has been done almost entirely in rats and mice. If you have chronic kidney disease (CKD) or are on dialysis, don't change or replace any treatment, and ask your nephrologist before adding hydrogen water, especially if you have a fluid limit or are considering magnesium-based tablets.

What has actually been studied?

Research on hydrogen and kidneys falls into four very different groups, and only a small slice of it involves people drinking hydrogen water.

What was tested	Who	What it found	Strength of evidence
Hydrogen dissolved in hemodialysis fluid (about 30–130 ppb)	People on hemodialysis	Lower markers of inflammation and oxidative stress, better blood pressure control, less reported fatigue [1–5]	Limited: small or non-randomized studies, mostly from one research group
Drinking hydrogen water or taking hydrogen capsules for CKD	People with CKD	No controlled trials found; one single-patient case report [6, 7]	Very weak
Drinking hydrogen-rich water for kidney stones	100 people with stones	Hydrogen water alone did about the same as standard treatment alone [8]	One small trial
Hydrogen water, hydrogen-rich saline injections or hydrogen gas	Rats and mice	Mostly less kidney injury after damage caused in the lab; one null result [9–15]	Animal only

ppb = parts per billion; 1,000 ppb equals 1 ppm, the unit usually used for drinking water. New to the topic? Start with what hydrogen water is.

What do the human dialysis studies show?

Adding hydrogen to the fluid used in hemodialysis has been linked to some encouraging changes in small studies. But this is a medical treatment delivered through a dialysis machine, not a drink, and no randomized trial has yet tested it on survival.

During hemodialysis, your blood flows past dialysis fluid (dialysate) inside a filter for hours. In most of these studies, researchers used water electrolysis to dissolve a small amount of hydrogen into the purified water used to make the dialysate. In the largest study, dialysate flowed at 500 mL per minute during 4–5 hour sessions, three times a week, and the authors estimated that most of the hydrogen that reached the blood was breathed out during the session [4]. That is a very different route from sipping a glass of water.

Most of these studies come from one Japanese research group (Nakayama and colleagues):

• 6-month trial (2010). 21 people on stable hemodialysis switched to hydrogen-enriched dialysate (average 48 ppb) for six months. No adverse signs or symptoms were seen. Systolic blood pressure fell, and the share of patients with a post-dialysis systolic pressure under 140 mmHg rose from 21% to 62%. Two inflammation markers (MCP-1 and myeloperoxidase) dropped. There was no comparison group [1].
• Crossover study. Eight patients each had one standard session and one hydrogen session (about 50 ppb). Blood leaving the filter had less oxidized albumin, a marker of oxidative stress, only after the hydrogen session [2].
• Long-term observational study. 309 patients (161 on hydrogen dialysis, 148 on standard dialysis) were followed for an average of 3.28 years. There were 41 combined events (deaths or major heart, stroke or amputation events) in the hydrogen group versus 50 in the standard group. After adjusting for age, heart disease history, albumin and C-reactive protein, the hydrogen group had a 41% lower risk of this combined outcome (hazard ratio 0.59). But patients were not randomized, since their doctors chose who got which treatment, and the death rate on its own did not differ between groups. The authors wrote that a randomized trial is "critically needed" [4]. An earlier 12-month report from the same study found less severe fatigue and itching in the hydrogen group [3], but the final paper said the effect on symptoms could not be concluded [4].
• Fatigue study (2025). 81 patients were followed for 12 months after their clinic switched everyone to hydrogen dialysis (70–130 ppb). Among the 25 most fatigued patients, fatigue on dialysis days fell from an average of 5.6 to 3.6 on a 0–10 scale. No group stayed on standard dialysis for comparison, which the authors list as a limitation [5].

These results are a reasonable case for a proper randomized trial. They do not show that drinking hydrogen water helps kidneys, and they don't apply to people who aren't on dialysis.

Is there evidence for drinking hydrogen water if you have CKD?

Very little. In our PubMed search (September 2026), we did not find a single controlled trial in which people with CKD drank hydrogen water and had their kidney function (eGFR, creatinine or urine protein) measured.

• A 2025 scoping review of 69 publications on hydrogen and kidney disease listed only "preliminary clinical case reports" as the human evidence for drinking hydrogen water, and called for more robust clinical trials [6].
• The one case report we found describes an 89-year-old woman with diabetic kidney disease, lupus and heart disease whose serum creatinine fell after she started taking hydrogen capsules [7]. A single patient with no comparison can't tell us whether hydrogen caused the change.

Claims that hydrogen water "heals" kidneys go well beyond anything tested in people.

Can hydrogen water help with kidney stones?

Not based on current evidence. The only human trial found little difference from hydrogen water on its own.

In a 2026 randomized trial from Shanghai, 100 people with kidney stones were split into four groups for 12 weeks, and everyone also received standard guideline treatment [8]. The "total effective rate" was 28% with standard treatment alone, 32% with added hydrogen-rich water, 76% with a traditional Chinese herbal formula, and 80% with both. The authors reported that hydrogen water alone improved only one antioxidant enzyme (glutathione reductase). We could access only the abstract, which doesn't report the hydrogen concentration used.

In mice fed a high-oxalate diet, hydrogen-rich water reduced crystal deposits and kidney injury [9]. That is an animal model, not evidence in people.

For preventing stones, the U.S. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) says drinking enough liquid, mainly water, is the most important thing you can do, and to ask a health professional how much you should drink [16]. Hydrogen water counts as water, but so does tap water.

What do the animal studies show?

In rats and mice, hydrogen (as drinking water, injected saline or inhaled gas) often reduced kidney damage that researchers caused on purpose. These are early signals, not evidence of benefit in people.

Representative studies (all in animals):

• Chemotherapy injury. In mice given the cancer drug cisplatin, inhaled hydrogen (1%) or drinking hydrogen water (0.8 mM) lowered markers of kidney damage. Hydrogen did not reduce cisplatin's anti-tumor effect in cancer cells or tumor-bearing mice [10].
• Transplant. Rats that drank hydrogen water for 150 days after a kidney transplant had better graft function, slower chronic graft damage and better survival [11].
• Blood-flow injury. In rats whose kidney arteries were clamped for 45 minutes, a hydrogen-rich saline injection given just before blood flow returned lowered creatinine, blood urea nitrogen and inflammation markers. Nitrogen-rich saline had no such effect [12].
• High blood pressure. Hypertensive rats that drank hydrogen water (1.3 ± 0.2 mg/L) for three months had less kidney injury, but their blood pressure did not change [13].
• Metabolic syndrome model. In rats bred to develop metabolic syndrome, 16 weeks of hydrogen-rich water cut reactive oxygen species production in the kidney by 34%. That is a lab marker, not a measure of kidney function [14].
• A null result. In rats with polycystic kidney disease, drinking hydrogen-rich water from 5 to 15 weeks of age did not change cyst size compared with plain water [15].

Why animal results often don't carry over to people

• Many of the injuries are created suddenly (clamped arteries, toxic drug doses), while CKD in people usually develops slowly over years.
• Several studies injected hydrogen-rich saline or used gas, not drinking water.
• Lab animals are young, genetically similar and few in number, and results are often tissue markers, not long-term outcomes.
• The 2025 scoping review notes that the field still relies mostly on preclinical or small clinical studies that often lack standardized endpoints or strong randomization [6].

Is hydrogen water safe if you have kidney disease or are on dialysis?

Hydrogen itself hasn't shown a specific kidney risk, but drinking hydrogen water hasn't been safety-tested in people with CKD. The practical concerns are fluid volume and, for some products, magnesium.

• Fluid limits come first. On hemodialysis, extra fluid can build up between sessions and cause swelling, blood pressure changes, strain on the heart and fluid in the lungs, and dialysis can only remove so much fluid safely [17]. Hydrogen water is still water. If your care team has set a fluid limit, any hydrogen water has to fit inside that limit, not on top of it.
• Magnesium-based tablets and sticks add magnesium. They make hydrogen by reacting magnesium metal with water (Mg + 2H₂O → Mg(OH)₂ + H₂), so magnesium ends up in the drink [18]. The kidneys largely control the body's magnesium balance [19], and in healthy people they clear any excess in the urine [20]. The Merck Manual notes that high blood magnesium (hypermagnesemia) usually develops only when people with kidney failure are given magnesium salts or take magnesium-containing medicines, such as some antacids or laxatives [21]. For adults in general, the upper limit for magnesium from supplements and medicines is 350 mg a day [20]. If you have CKD, check the label and ask your nephrologist before using any magnesium-based product.
• Alkaline "ionized" water is a different product. In the dialysis research, electrolyzed water was only a starting material: it was purified by reverse osmosis and made into dialysate with the same electrolytes and pH as standard fluid [4]. Those studies tell us nothing about drinking alkaline ionized water from a home machine. See hydrogen water vs. alkaline water.
• Drug interactions are not well studied. No interactions have been established, but there is little data either way. Tell your nephrologist and pharmacist about anything you add.
• In the dialysis studies, no adverse effects were reported at the hydrogen levels used [1, 4].

For general side effects, see hydrogen water side effects.

What the evidence doesn't show

• No randomized trial shows that drinking hydrogen water slows CKD, improves eGFR, delays dialysis or prevents kidney stones.
• The human dialysis data come mostly from one research group, use small or non-randomized designs and rely heavily on markers; the one long-term study found no difference in deaths alone [4].
• Hydrogen concentrations, delivery methods and study lengths vary widely, which makes results hard to compare [6].
• Animal findings, even consistent ones, are hypotheses to test, not reasons to change treatment.

See how we grade studies in our methodology, browse all kidney health research in our database, or read our wider verdict: is hydrogen water real or fake?

Frequently asked questions

Can hydrogen water reverse kidney damage or lower creatinine?

There is no evidence that it can in people. No controlled trial has tested drinking hydrogen water on kidney function in people with CKD, and the only human report is a single case, which can't show cause and effect. Claims about reversing damage come from animal studies of short-term injuries caused in the lab.

Is hydrogen water safe for dialysis patients?

Hydrogen added to dialysis fluid has not caused reported problems in studies, but that is a medical system, not a drink. Drinking hydrogen water has not been safety-tested in dialysis patients, and it counts toward your daily fluid limit. Talk to your nephrologist or dialysis team before trying it.

Does hydrogen water help with kidney stones?

In the one human trial, adding hydrogen-rich water to standard treatment for 12 weeks worked about the same as standard treatment alone (32% vs 28% rated effective). Drinking enough water in general is the main lifestyle step for preventing stones, and plain water does that job.

Are hydrogen water tablets safe if I have kidney disease?

Ask your nephrologist first. Magnesium-based tablets and sticks leave magnesium in the water, and people with kidney failure are the main group who develop high blood magnesium from extra magnesium. Check the label for the magnesium amount and bring it to your next appointment.

Sources

1. Nakayama M, et al. A novel bioactive haemodialysis system using dissolved dihydrogen (H2) produced by water electrolysis: a clinical trial. Nephrology Dialysis Transplantation. 2010. PubMed · Our summary
2. Terawaki H, et al. Effect of a hydrogen (H2)-enriched solution on the albumin redox of hemodialysis patients. Hemodialysis International. 2014. PubMed · Our summary
3. Nakayama M, et al. Possible clinical effects of molecular hydrogen (H2) delivery during hemodialysis in chronic dialysis patients: interim analysis in a 12 month observation. PLoS One. 2017. PubMed · Our summary
4. Nakayama M, et al. Novel haemodialysis (HD) treatment employing molecular hydrogen (H2)-enriched dialysis solution improves prognosis of chronic dialysis patients: a prospective observational study. Scientific Reports. 2018. PubMed · Our summary
5. Nakayama M, et al. Hemodialysis employing molecular hydrogen (H2) enriched dialysis solution may improve dialysis related fatigue through impact on energy metabolism. Scientific Reports. 2025. PubMed · Our summary
6. Viana J, et al. Molecular hydrogen and kidney diseases: a scoping review based on scientometry and data analytics. Medical Gas Research. 2025. PubMed · Our summary
7. Lin YT, et al. Molecular hydrogen as a potential adjunctive therapy to improve renal function and reduce fatigue in an elderly patient with chronic comorbidities: a case report. In Vivo. 2025. PubMed · Our summary
8. Yin Y, et al. Hydrogen-rich water combined with traditional Chinese medicine compound in the treatment of kidney stones: a randomized controlled prospective clinical trial. Medical Gas Research. 2026. PubMed
9. Si Y, et al. Oral hydrogen-rich water alleviates oxalate-induced kidney injury by suppressing oxidative stress, inflammation, and fibrosis. Frontiers in Medicine. 2021. PubMed · Our summary
10. Nakashima-Kamimura N, et al. Molecular hydrogen alleviates nephrotoxicity induced by an anti-cancer drug cisplatin without compromising anti-tumor activity in mice. Cancer Chemotherapy and Pharmacology. 2009. PubMed · Our summary
11. Cardinal JS, et al. Oral hydrogen water prevents chronic allograft nephropathy in rats. Kidney International. 2010. PubMed · Our summary
12. Wang F, et al. Hydrogen-rich saline protects against renal ischemia/reperfusion injury in rats. Journal of Surgical Research. 2011. PubMed · Our summary
13. Xin HG, et al. Consumption of hydrogen-rich water alleviates renal injury in spontaneous hypertensive rats. Molecular and Cellular Biochemistry. 2014. PubMed · Our summary
14. Katakura M, et al. Hydrogen-rich water inhibits glucose and α,β-dicarbonyl compound-induced reactive oxygen species production in the SHR.Cg-Leprcp/NDmcr rat kidney. Medical Gas Research. 2012. PubMed · Our summary
15. Yamasaki M, et al. Effects of hydrogen-rich water in a rat model of polycystic kidney disease. PLoS One. 2019. PubMed · Our summary
16. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Eating, Diet, & Nutrition for Kidney Stones. niddk.nih.gov
17. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Eating & Nutrition for Hemodialysis. niddk.nih.gov
18. Nakao A, et al. Effectiveness of hydrogen rich water on antioxidant status of subjects with potential metabolic syndrome — an open label pilot study. Journal of Clinical Biochemistry and Nutrition. 2010. PubMed · Our summary
19. NIH Office of Dietary Supplements. Magnesium — Fact Sheet for Health Professionals (updated January 6, 2026). ods.od.nih.gov
20. NIH Office of Dietary Supplements. Magnesium — Fact Sheet for Consumers. ods.od.nih.gov
21. Merck Manual Consumer Version. Hypermagnesemia (High Level of Magnesium in the Blood). merckmanuals.com

How we wrote this: drafted with AI assistance from the sources above and checked against each source by the Hydrogen Studies editorial team. This is general information, not medical advice — talk to your clinician before changing any treatment.