GNC Potassium and Magnesium Aspartate 250mg Supplement
- Potassium
- Capsule
- Gelatin
- 240
- Better rated than 63%
- More reviewed than 65%
A gelatin capsule potassium and magnesium supplement from a recognizable retail brand, offering 240 servings for buyers focused on water balance support.
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How it ranks among the 93 potassium we track
4.7★ across 928 Amazon ratings, Bayesian-smoothed toward the category average.
928 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
100+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 93 potassium we track - how the scorecard works · full potassium data report. Confidence: high - strong rating volume and complete data.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
GNC's Potassium and Magnesium Aspartate supplement lists 250mg dosing with a 240 serving count, marketed to help regulate water balance. It comes in gelatin capsule form and is labeled gluten free.
Potassium and magnesium aspartate combinations are commonly used for electrolyte and water balance support, and GNC states 250mg as the dose reference, though the listing does not break out how much is potassium versus magnesium. The 240 serving count gives a long supply window compared with many smaller bottles in this category.
- Potassium and Magnesium Aspartate, 250mg
- 240 servings
- Gelatin capsule
- Gluten free
Who it's for
Works for buyers wanting a long running electrolyte supplement without flavor additives. Not a fit for anyone who needs the potassium and magnesium amounts split out separately for a medical restriction.
Strengths and trade-offs
Drawn from this product's published specifications.
- 240 servings per bottle
- Gelatin capsule form
- Recognizable retail brand
- Potassium and magnesium amounts not broken out separately
- No customer reviews in available data
Performance notes
The 250mg figure in the product name refers to the aspartate compound rather than confirming separate potassium and magnesium amounts, so it functions best as a general electrolyte support product rather than a precisely dosed one.
Specifications
| Brand | GNC |
|---|---|
| Model | 257223 |
| Form | Capsule |
| Supplement Type | Gelatin |
| Count | 240 |
| Flavor | Unflavored |
| Benefits | Supports overall health and wellness |
| Diet | Gluten Free |
How it compares
This product against the closest alternatives we track in potassium.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| GNC Potassium and Magnesium Aspartate 250mg SupplementThis product | 4.7 / 5 | 928 | 4.2 / 5 |
| NOW FOODS Potassium CitrateNow | 4.7 / 5 | 22,400 | 4.6 / 5 |
| Nature Made Potassium Gluconate 550 mgNATURE | 4.7 / 5 | 15,900 | 4.6 / 5 |
| Nutricost Potassium Citrate 99mgNutricost | 4.7 / 5 | 14,800 | 4.6 / 5 |
| NaturalSlim Natural Potassium Citrate Gluconate 99 mgNaturalSlim | 4.8 / 5 | 13,600 | 4.7 / 5 |
Similar potassium from other brands
Questions about the GNC 257223
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
How many servings does this GNC supplement provide?
240 servings per container.
What form are the capsules?
Gelatin capsules.
Is it gluten free?
Yes.