Key takeaways
- Hydrogen water = drinking water containing dissolved H₂.
- Saturation at standard pressure and 25°C is around 1.6 ppm (1,600 ppb).
- Open containers lose H₂ within 1–2 hours; sealed insulated bottles hold it longer.
- Tablets, machines and PEM bottles each produce H₂ at very different concentrations and costs per litre.
How H₂ ends up in your glass
Three production methods dominate consumer use: magnesium tablets (chemical reaction), inline H₂ generators (PEM electrolysis), and standalone PEM bottles you fill and run for a few minutes.
All three add H₂ to water. The differences are concentration, repeatability, and cost per litre over time.
Reading concentration claims
Reputable claims state both the concentration (ppm or ppb) and the measurement method — typically a hydrogen-specific test reagent or a dissolved-H₂ meter.
Be sceptical of unqualified "high concentration" wording. Without numbers and method, the figure is unverifiable.
Frequently asked questions
Pure hydrogen is tasteless. Any taste difference comes from the water itself, not the H₂.
An open glass typically loses most of its dissolved H₂ within 1–2 hours. A sealed insulated bottle holds it for 8–12 hours.
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Types of hydrogen machines
Continue →Purity, tablets & bathing
- Hydrogen Bathing vs Hydrogen Tablets — Saturation versus dilution, compared in full.
- Hydrogen Water Purity — 99.991% certified purity from SPE/PEM electrolysis.
- Hydrogen Tablets: What You Should Know — What dissolving reactive material can leave behind.
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Source content adapted from guides/hydrogen-water.