Label arithmetic · NIH DSLD 243047
GNC Magnesium Powder Lemon: 325 mg of magnesium per 4 gram, 84 servings
325 mg of magnesium in each 4 gram, about 84 servings per 11.85 Ounce. From carbonate + citrate. Inside: label lines, ingredients.
GNC Magnesium Powder Lemon was observed at $22.99 on 2026-11-02 for 55.3 servings of 325 mg elemental magnesium as citrate: $0.1279 per 100 mg, not ranked while its match is likely (ranked prices observed 2026-10-26 to 2026-11-02). NIH DSLD 243047, label dated 2021-01-22.
computed from the filed labelData release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-11-02 · chemistry 2026-10-17
Mass: not computable · Price: $0.1279 per 100 mg · % DV: 77% vs 77%
Elemental: The magnesium itself; the rest of the compound weight is the partner molecule.
Compound: The whole salt, such as magnesium glycinate, that must physically fit in the capsule.
Size 000: The largest standard capsule, about 1,100 mg of powder at 0.8 g/mL, the top of the usual 0.6–0.8 range; size 00 holds about 730 mg and size 0 about 545 mg.
Recompute with your price
Enter the price you paid; the declared amount and servings of this label are prefilled, so the result is the cost per 100 mg of elemental magnesium for your bottle.
Same-salt comparison appears here.
How much magnesium compound powder is in one scoop?
The compound mass behind this label cannot be computed as of 2026-11-02: Single-salt capacity audit excluded as of 2026-10-17: one salt with a defined elemental fraction is not resolved.. The filed amounts are listed in the next block.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | 325 mg |
| Units per serving | Not a discrete unit as of 2026-11-02 |
| Magnesium salt per serving | Not computable as of 2026-11-02 |
| Magnesium salt per serving | Not computable as of 2026-11-02 |
| Capsule capacity 0 · 00 · 000 | 545 · 730 · 1,100 mg |
| Verdict | Not computable as of 2026-11-02 |
Source · NIH DSLD 243047 · label 2021-01-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
GNC Magnesium Powder Lemon files 1 magnesium line in NIH DSLD 243047; the selected primary line declares 325 mg of elemental magnesium per serving, against 0 other rows excluded from the primary amount. A salt named under another nutrient does not turn that nutrient's quantity into elemental magnesium.
measured| Filed amount | Salt or note as filed | Role |
|---|---|---|
| 325 mg | carbonate, citrate · Magnesium (Form: as Magnesium Citrate, and Magnesium Carbonate) | Primary serving |
Source · NIH DSLD 243047 · label 2021-01-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Does this label's magnesium claim hold up, or could the magnesium come from another source?
The label names 2 magnesium forms (carbonate, citrate); a named blend does not establish how much magnesium each form contributes, so the resolved reading is the most favourable one, compared with oxide, the salt richest in magnesium at 60.3%.
computed with assumption| Form named on the label | Elemental fraction | Source |
|---|---|---|
| Magnesium carbonate | 24.8–28.8% | named on label |
| Magnesium citrate | 11.3–16.2% | named on label |
Source · NIH DSLD 243047 · label 2021-01-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Is this a good price for the elemental magnesium I'm actually getting?
GNC Magnesium Powder Lemon costs $0.1279 per 100 mg of elemental magnesium at the price observed 2026-11-02, not ranked while its match is likely, against a same-salt median of none; prices observed 2026-10-26 to 2026-11-02. First observed 2026-08-10 at $22.99, latest 2026-11-02 at $22.99, 9 observations.
computed| Rank | Label | Per 100 mg | Observed |
|---|---|---|---|
| On review | GNC Magnesium Powder Lemon (this label) | $0.1279 | 2026-11-02 |
Source · Amazon via licensed data provider; NIH DSLD · unique ASIN × date; prices observed 2026-10-26 to 2026-11-02 · release 2026-08-10-f441aa9f · CSV · method
How many days will this bottle last at the label's own serving, and what does a day cost?
At the label's own serving, GNC Magnesium Powder Lemon lasts 84 days: 84 servings against 1 serving a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 11.85 Ounce(s); 336 Gram(s) |
| Serving size as filed | 4 Gram(s) (1 Scoop) |
| Servings per container | 84 |
| Servings per day in the directions | 1 |
| Days per bottle | 84 days |
| $ per 30 days at one label serving a day | $12.47 |
| $ per 30 days at 420 mg Daily Value | $16.12 |
Source · NIH DSLD 243047 · label 2021-01-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "77% Daily Value" mean here, and does it recompute?
The label declares 77% Daily Value; 325 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 77%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 77% | 420 mg | 77% |
Source · NIH DSLD 243047; 21 CFR 101.9 · label 2021-01-22 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain these other ingredients, what shell is it, and who is it filed for?
GNC Magnesium Powder Lemon files 4 other ingredients.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Natural flavor |
| 2 | Citric Acid |
| 3 | Malic Acid |
| 4 | Stevia |
| Target group | Adult (18 - 50 Years) |
Source · NIH DSLD 243047 · label 2021-01-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What has research measured about this form, and about side effects?
No study in the registry measured an unresolved salt as of 2026-11-02.
measured| Year | Study | PubMed |
|---|
Source · PubMed-checked study registry · registry checked 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Has this brand had FDA recalls or adverse event reports?
GNC has 3 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. GNC has FDA CAERS adverse event reports on record at brand level, as do 143 of 273 brands in this registry; openFDA states that “there is no certainty that the reported event (adverse event) was actually due to the product” and that reports “cannot be used to estimate the incidence of these events.”
measured| Recall | Date | Reason | Status |
|---|---|---|---|
| F-0626-2017 | 2016-12-14 | Undeclared Allergen: Milk. | Terminated |
| F-1734-2022 | 2022-09-21 | The firm was notified by a customer that the bottle contains green and white capsules instead of the usual white round tablets. They contacted their manufacturer to investigate the issue and the manufacture stated that there was a problem at the filling line. Bottles labeled as Vitamin B6 actually contained Pycnogenol. | Terminated |
| F-0928-2025 | 2025-06-11 | Undeclared Fish allergen (parvalbumin). | Terminated |
Source · openFDA enforcement and CAERS · queried 2026-10-19 · release 2026-08-10-f441aa9f · CSV · method
Is this the same formula as another brand's, and how do their prices differ?
No other brand files the same formulation (ingredients, shell, units and rounded amount) as of 2026-11-02.
computed| Label | Brand | Price per 100 mg |
|---|---|---|
| No cross-brand match as of 2026-11-02 |
Source · NIH DSLD 243047 · label 2021-01-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which labels are closest to this one, with the same salt and dose?
No other label files the same resolved salt within ±10% of this label's dose per unit as of 2026-11-02.
computed| Label | Elemental per unit | Price | Verdict |
|---|---|---|---|
| No neighbour as of 2026-11-02 |
Source · NIH DSLD 243047 · label 2021-01-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Where does this record come from, what is missing, and how do I cite or correct it?
Every value on this page traces to NIH DSLD 243047 (label 2021-01-22, snapshot 2026-08-10), a price observed 2026-11-02 and the chemistry model of 2026-09-13. 2 gaps remain: Single-salt capacity audit excluded as of 2026-10-17: one salt with a defined elemental fraction is not resolved.; A single salt with a defined elemental fraction is unresolved as of 2026-11-02. The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 243047 |
| Label date | 2021-01-22 |
| Date entered into DSLD | 2021-01-22 |
| Barcode (UPC) as filed | 0 48107 20986 5 |
| Distributed by | General Nutrition Corporation, Pittsburgh, PA, USA |
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
| Formula re: Contains | Magnesium helps build strong bones and maintain healthy teeth. It's also involved in heart, skeletal muscle, nerve and cell function, and it's required by the body for energy production. |
10 additional rows
| Field | As filed |
|---|---|
| Suggested/Recommended/Usage/Directions | Adding Magnesium Powder to your favorite beverage is a delicious way to boost your daily nutrition and health regimen. |
| Formulation re: Other | Essential for strong bones & teeth Necessary for muscle & nerve function |
| Formula re: Contains | Lemon Natural flavor |
| FDA Statement of Identity | Dietary Supplement |
| Suggested/Recommended/Usage/Directions | Directions: As a dietary supplement, mix one scoop in 6 to 8 fl oz. of water or your beverage of choice once daily. Do not exceed recommended dose. |
| Precautions re: Children | Keep out of reach of children. |
| Storage | Store in a cool, dry place. |
| FDA Disclaimer Statement | These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. |
| Physical state | Powder |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 243047 · label 2021-01-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
6 brand pages linked below contain magnesium labels from the NIH DSLD registry snapshot dated 2026-08-10.