Supplement Label Index

Potassium Chloride vs. Potassium Bicarbonate

Among 3,345 on-market potassium products with an identifiable primary form, 36.8% use Potassium Chloride (1,232 products) and 9.9% use Potassium Bicarbonate (332).

Potassium ChloridePotassium Bicarbonate
Quality tierTier 1Tier 1
Potassium by weight52.4%39.1%
Share of market36.8%9.9%
On-market products1,232332
Median declared dose70 elemental mg
middle half: 30–99
110 elemental mg
middle half: 95–200
Most common brandsNOW, DC, Vitamin WorldIsotonix, Nuun, Pure Essence Ionic-Fizz

Doses are declared per serving in elemental mg. “By weight” is the share of the ingredient that is the nutrient itself (e.g. elemental magnesium in a magnesium salt).

Why Potassium Chloride is tier 1

Standard reference form used in essentially all major clinical hypokalemia/blood-pressure trials.

Source: Whelton PK et al. 1997, JAMA 277(20):1624-32, PMID 9168293

Why Potassium Bicarbonate is tier 1

Used at doses shown to reduce urinary calcium excretion and bone-resorption markers in older adults, implying good systemic delivery (not a head-to-head absorption comparison).

Source: Sebastian A et al., PMID 18940881

Tiers summarize published comparative bioavailability or outcome evidence for each form (see methodology). This page describes the market; it is not a recommendation to take either form. Talk to a clinician about what's right for you.

Other potassium comparisons