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.
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Source content adapted from guides/hydrogen-water.