Potassium Bicarbonate vs. Potassium Aspartate
Among 3,345 on-market potassium products with an identifiable primary form, 9.9% use Potassium Bicarbonate (332 products) and 9.3% use Potassium Aspartate (310).
| Potassium Bicarbonate | Potassium Aspartate | |
|---|---|---|
| Quality tier | Tier 1 | Tier 2 |
| Potassium by weight | 39.1% | 22.8% |
| Share of market | 9.9% | 9.3% |
| On-market products | 332 | 310 |
| Median declared dose | 110 elemental mg middle half: 95–200 | 50 elemental mg middle half: 25–99 |
| Most common brands | Isotonix, Nuun, Pure Essence Ionic-Fizz | Douglas 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 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
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
- Potassium Citrate vs. Potassium Chloride
- Potassium Citrate vs. Potassium Bicarbonate
- Potassium Citrate vs. Potassium Aspartate
- Potassium Citrate vs. Potassium Gluconate
- Potassium Chloride vs. Potassium Bicarbonate
- Potassium Chloride vs. Potassium Aspartate
- Potassium Chloride vs. Potassium Gluconate
- Potassium Bicarbonate vs. Potassium Gluconate
- Potassium Aspartate vs. Potassium Gluconate