GNC Potassium Plus 99
Brand: GNC · Form: SUPPLEMENT FORM, OTHER [E0172] On Market
Our assessment
The evidence shows that GNC Potassium Plus 99 is a targeted supplement, but you need to be aware of the key ingredient data. The primary active ingredient is calcium, not potassium, based on the available data. Our assessment: You should not use this product to address potassium levels, as the data only covers calcium. For general bone and nerve health, calcium can play a role, but the specific benefit for you depends on your dietary intake and health goals [NIH ODS].
How it works
Think of calcium as a structural and signaling mineral. It supports bone mineralization, meaning it helps deposit minerals to keep your skeleton dense and strong. It also plays a role in neuromuscular relaxation, helping your muscles relax and your nerves send signals properly [NIH ODS]. However, without specific potassium data for this product, we cannot confirm its role in blood pressure or muscle function. Data not available for potassium mechanism in this specific product.
Safety profile
FDA has received a total of 592,059 adverse event reports across all supplements, though specific numbers for this product are not isolated in the data. For the calcium ingredient, side effects from high intake include constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, and abnormal heart rhythms. High levels can also cause poor muscle tone, poor kidney function, and a high risk of death from heart disease [NIH ODS] [FDA data]. Calcium can reduce the absorption of medications like bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin. You should separate calcium intake from these medications by at least 2 hours [NIH ODS].
Our recommendation
We recommend you do not rely on this supplement for potassium. Since the data only confirms calcium as the active ingredient, consider a different product if your goal is to increase potassium. For calcium, start by assessing your dietary intake. Most adults need 1,000 to 1,200 mg of calcium daily from food and supplements combined [NIH ODS]. If you choose to use this product, take it with food and stay well hydrated. Always consult your doctor before starting, especially if you take any of the medications listed above [NIH ODS].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | GNC |
|---|---|
| Serving Size | |
| Contents | 60.0 Caplet(s) |
| Market Status | On Market |
How to Read This Label
Supplement labels contain several key sections regulated by the FDA:
- Serving Size — The recommended amount per dose. Always check this — some products require multiple capsules per serving.
- Amount Per Serving — Shows the quantity of each nutrient in the product, typically in IU (International Units), mg (milligrams), or mcg (micrograms).
- % Daily Value (%DV) — Indicates how much a nutrient in a serving contributes to a daily diet. 5% DV or less is low; 20% DV or more is high.
- Other Ingredients — Lists inactive ingredients like fillers, binders, and capsule materials (e.g., gelatin, cellulose, magnesium stearate).
- Suggested Use — The manufacturer's recommended directions for taking the supplement, including timing and dosage.
Source: FDA Dietary Supplement Labeling Guide