Alkaline water has a higher pH than regular tap water—usually around 8 or 9 instead of the neutral 7. The idea is that it can neutralize acid in your body, which sounds nice if you imagine your bloodstream as a vat of battery acid.
Here’s the thing: your body is a control freak. Your lungs and kidneys work 24/7 to keep your blood pH in a very tight range around 7.4. No amount of fancy water you drink is going to overrule that system—unless you drink so much that you land in the hospital, but that’s a different story.
What the Studies Actually Say (Spoiler: Not Much)
A few small studies show that alkaline water might help with acid reflux by deactivating pepsin, an enzyme. One study even suggested it could improve blood viscosity after a hard workout. Key word: suggested.
But most of these studies are tiny, funded by water companies, or look at people who are already dehydrated. You know what else improves blood viscosity? A glass of regular water. And a nap. And not running a marathon on an empty stomach.
