Alexe -
The label on one of my potassium products which is Professional-grade supplement indicates: Potassium… 125 mg sourced from 320 mg potassium bicarbonate
Another is a combination of Potassium glycinate complex and potassium bicarbonate at 300 mg/capsule but it doesn’t break out the bicarbonate or glycine component.
The NOW brand Potassium gluconate powder does not separate out the amount of potassium delivered. The the dose is 1/2 teaspoon yields 270 mg potassium gluconate. I typically use a teaspoon at a time for 540 mg but that's not all pure potassium.
I also have potassium citrate tablets from Natural Factors and again, the citrate component is not separated out....of the total 99 mg/tablet. Dosing recommendations are take 1 tablet 1 - 5 times a day as recommended by healthcare professional.
Hope this helps.
Jackie