01Why you are here
You probably read this far for one of these four reasons:
Something is not working. In your body or in the body of someone you love. A chronic illness, a recent diagnosis, a symptom your doctor has not been able to fully explain, a recovery that is taking too long.
You want to optimize what is already working. Your athletic performance, your mental clarity, your energy after 3 p.m., your recovery between training sessions. You are healthy, but you know that "healthy" can move up or down — and you would rather it move up.
You want to prevent what you saw in your family. Diabetes, cancer, Alzheimer's, heart attacks. You know your genetic history and you are not going to wait until it is your turn to do something about it.
You want superior hydration. You know the water you drink today (filtered, bottled, from the jug) is not optimal — and you are looking for what is, based on data.
Any one of the four is valid. This directory was built for all four.
I will answer you honestly before you go on:
02What this directory is NOT
It is not a page of magical promises. If you have terminal cancer, this is not going to fix it.
It is not "wellness" content with pretty phrases and little substance. It is an evidence directory.
It is not marketing to sell you a specific brand. We will not recommend commercial brands to you.
03What it IS
It is a living atlas of 70 peer-reviewed studies, organized from the most solid evidence (meta-analyses combining thousands of patients) all the way to the extraordinary clinical case reports.
It is structured so that you can navigate straight to what matters to you. Each article lives on its own page, with its verifiable DOI, the exact data of the study (n, duration, dose, outcomes), and a plain-language explanation of what it means for you.
You can open only what concerns you. You do not have to read all 70.
04How it is organized
Level 1 — What science already considers established (6 articles)
Here are the meta-analyses and systematic reviews: when dozens of scientists reviewed thousands of studies and arrived at the same conclusion. The highest level of evidence that exists in medicine.
Cancer (PRISMA review). Cholesterol (meta-analysis). Long-COVID (systematic review). Physical performance (three independent meta-analyses).
If you read only this block, you already understand the most solid thing science has established about H₂.
Level 2 — The randomized controlled trials (54 articles)
RCTs (Randomized Controlled Trials) — the gold standard of medicine. When you group patients at random, give H₂ to one group and placebo to another, measure what happens, and publish the result.
The block opens with the study that probably matters to you most if you are over 40:
Article 7 — Zanini 2021. 6 months drinking water with H₂ lengthened telomeres in adults over 70.
Telomeres = the biological clocks of each cell. When they shorten, you age. When they hold steady, you don't. This study, published in Experimental Gerontology, showed that H₂ dissolved in ionizer water, over 6 months, measurably lengthened the telomere ratio in people whose telomeres were already shortening with age.
Not "it might help." They measured it. They published it.
From there, Level 2 moves by body system. Skip straight to yours:
• Cardiometabolic (art. 8-18): Diabetes, blood pressure, cholesterol, heart attack, metabolic syndrome
• Cognitive and neurological (art. 19-23): Memory, Parkinson's, anxiety, stroke
• Liver (art. 24-26): NAFLD, hepatitis B
• Long-COVID and post-COVID (art. 27-29)
• Autoimmune and chronic inflammation (art. 30-33): Rheumatoid arthritis, psoriasis, periodontitis
• Kidney and dialysis (art. 34-36)
• Other tissues (art. 37-43): Radiotherapy, myopathies, cystitis, major surgery, PMS
• Physical performance (art. 44-60): Recovery, strength, VO₂, ventilation, sprains
Level 3 — Observational and safety studies (8 articles)
Cases where standard protocols failed and H₂ was tried as an adjunct or last resort. Wounds that would not close and then did. Acute strokes where IV H₂ was part of the protocol. Diabetics on acarbose where the combination changed the inflammation.
Level 4 — Extraordinary case reports (2 articles)
Case series published in peer-reviewed journals. Medicine advances this way: someone tried something extraordinary in a specific patient, documented it with full academic rigor, and other doctors around the world were able to replicate it.
05What you will be able to do after exploring this directory
Talk to your doctor from a different position. You don't show up with "I read a blog." You show up with: "Doctor, there is a multicenter double-blind study in Diabetology International 2022 (Ogawa et al.) on insulin resistance and electrolyzed H₂ water. Have you reviewed it?"
That sentence opens a professional conversation, not a hallway debate. And the quality of the response you receive tells you a lot about your doctor's clinical curiosity.
Make decisions with judgment. Each article tells you how many people took part, for how long, at what concentration, what exactly happened. You don't have to trust me. You trust the study.
Distinguish what is from what isn't. There are products labeled "hydrogen water" that lose most of their H₂ before they reach your home. There is expensive equipment that does not produce the concentrations of the study. This directory teaches you how to identify what to look for (real concentration of 1,000–2,000 ppb, ORP between -400 and -900 mV, shelf life of dissolved H₂) without recommending any specific brand — because your purchase decision is yours, not ours.
Know whether this is for you or not. Some conditions have massive evidence (diabetes, NAFLD, endurance sports, post-exercise recovery, aging). Others have preliminary evidence. Where the evidence is weak, we tell you. Where it is solid, we also tell you.
06An honest warning
H₂ is not for everyone at every moment. If you take critical medications (anticoagulants, immunosuppressants, active chemotherapy), discuss it with your doctor first — not because there is established danger, but because the interactions have not all been studied yet, and prudence wins.
And if you believe your health is the responsibility of your insurance or your doctor: this directory is not for you. It is for people who have understood that the decision about what you put into your body each day is yours — and who want to make that decision informed.
07What makes H₂ different from any other antioxidant
Your body is producing free radicals right now, as you read this. Every breath. Every heartbeat. It is unavoidable and, in small amounts, even necessary.
The problem is accumulation. The kind that ages your arteries. The kind that oxidizes your LDL. The kind that damages your mitochondrial DNA. The kind your body tries to neutralize with its own systems (superoxide dismutase, catalase, glutathione) — systems that decline with age, just when you need them most.
H₂ does one thing that no other antioxidant does:
1. It crosses cell membranes (including the blood-brain barrier, reaching the brain) 2. It penetrates all the way to the mitochondria (where free radicals are generated) 3. It selectively neutralizes only the most damaging ones (hydroxyl radical, peroxynitrite) 4. It leaves intact the useful radicals your body needs for signaling 5. It does not accumulate, it does not get stored, it leaves the body within hours
That last point is the key difference: vitamin C in excess can oxidize. Iron supplemented in excess is pro-inflammatory. H₂ has no known ceiling of toxicity.
It was discovered as a therapeutic antioxidant in 2007 (Ohsawa et al., Nature Medicine). In 18 years there are more than 1,500 published studies. Seventy of the most solid ones are here.
08Where to start
If you have a specific condition: find your system in the menu (cardiometabolic, cognitive, liver, etc.) and open the relevant articles.
If you come for optimization or prevention: start with Article 7 (aging/telomeres) and then go to Physical Performance (articles 44-60).
If you want to understand the most solid evidence first: read the 6 articles in Level 1.
If you only have 10 minutes: read this text once more, open 2–3 articles from Level 1, and bookmark this page. Come back when you have more time.
The directory begins now. It is alive, it updates, and it grows as science publishes new findings.
[Go to the full index]
[Download the PDF with the links to the 70 articles]
Part II — The 70 Studies
