Supplement Label Index

Potassium Citrate vs. Potassium Aspartate

Among 3,345 on-market potassium products with an identifiable primary form, 36.8% use Potassium Citrate (1,232 products) and 9.3% use Potassium Aspartate (310).

Potassium CitratePotassium Aspartate
Quality tierTier 1Tier 2
Potassium by weight36.2%22.8%
Share of market36.8%9.3%
On-market products1,232310
Median declared dose50 elemental mg
middle half: 30–99
50 elemental mg
middle half: 25–99
Most common brandsSource Naturals, Wonder Laboratories, Life ExtensionDouglas Laboratories, Bluebonnet, Pure Encapsulations

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 Citrate is tier 1

Reported bioequivalent in absorption to potassium chloride; preferred clinically for kidney-stone prevention/urinary alkalinization rather than for an absorption advantage.

Source: uncertain -- needs review for exact primary comparative-PK source

Why Potassium Aspartate is tier 2

No dedicated comparative bioavailability study located; assumed acceptable given the label cross-check.

Source: uncertain -- needs review

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