[OutOfHere]

I actually was in the emergency in October last year. I had bicarbonate in the upper range of normal. This caused decreased extracellular potassium, still borderline as per hospital specs. Even so, this drop in potassium had been triggering worrying arrhythmia, specifically extreme tachycardia upon waking, possibly SVT.

Calcium is easy to get from supplements, and phosphorus from food, but don't mess with bicarbonate.

It turned out that my bicarbonate rise was driven by contributions from: potassium citrate (70%), alkaline water (8%), calcium bicarbonate (8%), calcium citrate (2%), and magnesium citrate (2%). I switched to calcium glycinate and magnesium glycinate capsules.

So no, my rise in bicarbonate was not driven by atmospheric CO2, but for a month, I got a taste of what happens even with a mild rise to the upper edge of the normal range.