Hydrogenated water and type 2 diabetes — reading the Kajiyama 2008 protocol

Hydrogen-rich water and type 2 diabetes: what does the Kajiyama 2008 protocol say? The first randomized clinical study to measure the effect of H₂ on glucose metabolism. A detailed reading of a foundational reference.

Context: why target diabetes

Type 2 diabetes involves three intertwined mechanisms: insulin resistance in peripheral tissues, pancreatic β-cell dysfunction, and — since 2000 — a recognized role of oxidative stress as an amplifier of the first two. ROS damage muscle and liver mitochondria, disrupt insulin signaling, and accelerate β-cell apoptosis. It is this oxidative mechanism that Kajiyama aimed to target.

The Kajiyama 2008 study — methodological detail

Design

Randomized, double-blind, placebo-controlled crossover study. Two 8-week periods separated by a 12-week washout. H₂-enriched water (≈ 1.2 ppm) vs. identical still bottled water.

Population

30 subjects: 24 with type 2 diabetes and 6 with impaired glucose tolerance (IGT). Inclusion criteria HbA1c 6.5 to 9%, without insulin. No change in treatment or diet during the study.

Protocol

900 mL/day of H₂-enriched water, divided into 3 doses (morning, noon, evening), to be drunk within 10 minutes of opening the aluminized sachet. Patients noted each intake.

Measurements

At W0 and W8 of each period: LDL-C, oxidized LDL (ox-LDL), HDL-C, triglycerides, fasting glucose, HbA1c, fasting insulin, HOMA-IR, oxidative stress markers (urinary 8-isoprostane, MDA), oral glucose tolerance test (75 g, 2 h).

Published results

Oxidized LDL: −15.5% (p < 0.05) with H₂ vs. placebo. Free fatty acids: −9.8% (p < 0.05). HOMA-IR: a trend towards improvement, significant in the IGT subgroup. HbA1c: no significant change at 8 weeks (duration probably insufficient: erythrocyte turnover is 3 months). Oxidative stress markers (MDA, 8-isoprostane): significant decrease with H₂. DOI: 10.1016/j.nutres.2008.01.008.

How to interpret these results

Pilot study, n = 30, with a modest sample size. The results on intermediate markers (ox-LDL, MDA) are robust; those on clinical parameters (HbA1c, fasting glucose) require longer and larger trials. This is precisely the authors' conclusion: “H₂-water consumption ameliorated oxidative stress markers in T2D and IGT subjects; large-scale long-term trials are needed to assess hard clinical outcomes.”

Practical protocol if you are diabetic

Step 1. Talk to your diabetologist first. Hydrogen-rich water does not replace metformin, insulin, or diet. Step 2. Do not modify any treatment on your own initiative. Step 3. If your doctor agrees to a trial, the Kajiyama protocol (900 mL/day, 3 doses) is the reference. ELITE 9K at 9,000 PPB largely delivers the target concentration. Step 4. Measure HbA1c at 12 weeks, weekly fasting glucose, and note how you feel.

What we are not saying

HYDROGENYX does not treat, cure, or prevent any disease. Hydrogen-rich water is a lifestyle supplement, not a medication. For diabetes, medical monitoring, prescribed treatment, regular physical activity, and controlled diet remain the documented pillars of management.

To go further

Read our 7 key studies 2026, the DPD protocol, or discover ELITE 9K manufactured at our Lyon 7^e workshop.

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