Hoe peer-reviewed H₂-studies lezen — Beginnersgids

Reading a peer-reviewed study on molecular hydrogen doesn't require a PhD — just a method and 6 key checks. Of the 320+ studies referenced by HYDROGENYX, 80% follow the same IMRaD structure. This guide teaches you how to navigate them in 10 minutes: where to find the real result, distinguish correlation from causation, identify biases, and recognize a solid study from weak evidence. You'll become able to judge for yourself, without relying on marketing summaries.

Prerequisites

• Material: PubMed access (free) or Google Scholar.
• Time: 10-15 min per study (vs 1 hr for full reading).
• Level: beginner. No statistical skills required.

1. Step-by-step method — Reading an H₂ study in 5 sections

Step 1 — Verify the publication type

First and foremost: is it peer-reviewed? Look for the journal name (Free Radical Research, Medical Gas Research, J Clin Biochem Nutr, etc.). Verify via Scimago Journal Rank (sjr.com): Q1 or Q2 = solid; Q3 or Q4 = to be confirmed. Avoid unpublished "preprints" and conferences without peer-review.

Step 2 — Read the Abstract (summary)

The abstract provides 95% of the useful information in 250 words. Read in this order:

• Objective: what did they want to prove?
• Methods: RCT (Randomized Controlled Trial)? How many participants? How long? What H₂ dose?
• Results: concrete numbers and p-value (< 0.05 = statistically significant).
• Conclusion: what do the authors recommend?

Step 3 — Identify the quality of the design

Hierarchy of evidence (from strongest to weakest):

1. Meta-analysis of multiple RCTs (Gold)
2. Double-blind placebo RCT (Silver)
3. Single-blind open RCT (Bronze)
4. Observational study / cohort (useful but limited)
5. In vitro / animal study (preliminary)
6. Individual case reports (anecdotal)

Step 4 — Read the Results section and tables

Tables contain the real numbers. Look for:

• Effect size: absolute delta (e.g., -39% oxidative stress markers).
• P-value: < 0.05 = significant; < 0.001 = very significant.
• 95% Confidence Interval (CI95): if the interval includes 0 or 1 (depending on metric), the effect is not reliable.
• Drop-outs: how many abandoned the study? > 20% = possible bias.

Step 5 — Read the Discussion and Limitations

Honest authors list their study's limitations (limited sample, short duration, possible bias). A study WITHOUT a limitations section = be wary. Also read "Funding source": conflicts of interest?

2. Common mistakes

Mistake #1 — Relying on the title alone. Titles are often optimistic. Always read the full abstract. A title "H₂ improves athletic performance" might hide "on only 8 cyclists, p=0.049, unconfirmed".

Mistake #2 — Confusing correlation and causation. "H₂ drinkers are less tired" ≠ "H₂ reduces fatigue". Only a controlled RCT proves causation. Observational studies = hypotheses.

Mistake #3 — Ignoring sample size. N=10 = weak signal. N=100+ = robust signal. Meta-analyses combine several studies to reach N=1000+.

Mistake #4 — Confusing PPB with biological concentration. 9,000 PPB in water ≠ 9,000 PPB in blood. H₂ bioavailability ~30-40%, short half-life. Read pharmacokinetic studies separately.

Mistake #5 — Citing a case report as general proof. "Ms. X recovered thanks to H₂" is a case, not proof. Level 6 in hierarchy, anecdotal value only.

3. FAQ — Your 5 frequent questions

Q1. How many H₂ studies exist in total?
~1,800 publications mention molecular H₂ on PubMed. ~320 are human clinical studies of Q1-Q2 quality. This is the HYDROGENYX reference corpus.

Q2. Which journals should I follow to stay updated?
Free Radical Research, Medical Gas Research, Antioxidants, Journal of Clinical Biochemistry and Nutrition. Free Google Scholar alerts on "molecular hydrogen".

Q3. How to access studies for free?
PubMed Central (PMC): 60% of H₂ studies are open access. For paid ones: Sci-Hub (grey area) or direct request to the author (often free).

Q4. Are Japanese studies reliable?
Yes, Japan has been a world leader in H₂ research since 2007 (Ohsawa, Nat Med). Tsukuba, Nagoya, Kyushu Universities produce the majority of RCTs.

Q5. How do I know if HYDROGENYX has referenced a study?
Our cornerstone /blogs/la-source/7-etudes lists the 7 main RCTs. Our thematic articles (sport, anti-aging, brain fog) cite specific studies with PubMed links.

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Paul Fournier, founder of HYDROGENYX. Lyon 7th workshop. 320+ peer-reviewed studies referenced on molecular hydrogen. 1,988 verified reviews 4.7/5. La Source — HYDROGENYX Journal.