Wellnesswellnesshonestscience

What 'alkaline water' actually does (and what it doesn't)

May 30, 2026
5 min read

Alkaline water is one of the most over-marketed and under-explained products in wellness. We sell it. We also think it's worth telling you what the evidence actually supports, because the gap between "what works" and "what's claimed" is too wide.

What "alkaline water" means, technically.

Water with pH above 7. Tap water is usually 6.5-8.5. The K1 produces water at pH 8.5-9.5 by passing it through an ionising chamber that separates the more alkaline fraction. There is nothing exotic about this. The chemistry is well-understood and reproducible.

What we measure, and why.

Three things, on the K1's display:

  • pH — how alkaline. Higher = more alkaline.
  • ORP (oxidation-reduction potential) — a measurement, in millivolts, of how easily the water donates electrons. Negative ORP means the water has antioxidant-style behaviour at the chemistry level. Our K1 outputs −300 to −500mV typically.
  • Dissolved hydrogen — concentration of H₂ gas dissolved in the water, usually 0.8-1.2 ppm in our units.

These are real, measurable numbers. We publish them. You can verify them with a $40 ORP meter.

What the evidence actually supports.

There are a small number of decent randomised trials on alkaline water and dissolved hydrogen in humans. The findings worth taking seriously:

  • Recovery from exercise-induced acidosis. Several trials, mostly in athletes, show modestly faster blood-pH normalisation post-exercise with alkaline water vs. plain water. Effect size: small but real.
  • Hydration efficiency. A few studies (n=100 to 200) show slightly better blood-volume restoration after dehydration. Not a huge effect.
  • Hydrogen-rich water and oxidative stress markers. A handful of small trials show measurable reductions in markers like malondialdehyde. The clinical relevance of this is genuinely unclear.

That's basically it. Modest, plausible, real-but-small effects.

What the evidence does not support.

The list of common claims that don't survive scrutiny:

  • "Cures cancer." No.
  • "Balances your body's pH." Your blood pH is regulated to within 0.05 units by your kidneys and lungs regardless of what you drink. Alkaline water does not change blood pH in a healthy person.
  • "Detoxifies." Not a coherent claim.
  • "Boosts metabolism by N%." No credible evidence.
  • "Anti-ageing." No.

If anyone selling water tells you any of these, they are bullshitting you. We're not going to.

The honest pitch.

Alkaline hydrogen water tastes good — softer, slightly sweeter than tap. The pH and ORP measurements are real and verifiable. The clinical effects, where they exist, are modest. It's a better daily drink than bottled water on most axes (taste, plastic, freshness) but it is not a medical product.

If that's enough to make you prefer it, great. If you were hoping for the cancer cure, we can't help you and neither can anyone else.

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