Label arithmetic · NIH DSLD 224666
GNC Magnesium 250 mg: 250 mg of magnesium per tablet, 1 tablet a day – gluconate + oxide
250 mg of magnesium per tablet, 1 a day. From gluconate + oxide; no US price matched (Nov 2). Inside: label lines, ingredients.
GNC Magnesium 250 mg declares 250 mg of elemental magnesium per 1 tablet(s); the magnesium salt is not resolved from the filed record, servings per container are not filed, Single-salt capacity audit excluded as of 2026-10-17: one salt with a defined elemental fraction is not resolved., as of 2026-11-02. No US retail price matched as of 2026-11-02. NIH DSLD 224666, label dated 2020-06-24.
as filedData release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-10-19 · chemistry 2026-10-17
Mass: not computable · Price: none matched · % DV: 60% vs 60%
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 is pressed into one tablet?
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 | 250 mg |
| Units per serving | 1 |
| Magnesium salt per serving | Not computable as of 2026-11-02 |
| Magnesium salt per tablet | 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 224666 · label 2020-06-24; 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 250 mg files 1 magnesium line in NIH DSLD 224666; the selected primary line declares 250 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 |
|---|---|---|
| 250 mg | gluconate, oxide · Magnesium (Form: as Magnesium Oxide, and Magnesium Gluconate) | Primary serving |
Source · NIH DSLD 224666 · label 2020-06-24; 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 (gluconate, oxide); 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 gluconate | 5.9% | named on label |
| Magnesium oxide | 60.3% | named on label |
Source · NIH DSLD 224666 · label 2020-06-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Is this a good price for the elemental magnesium I'm actually getting?
No US retail price is matched to this label as of 2026-11-02, and without a resolved salt there is no same-salt comparison.
computed| Rank | Label | Per 100 mg | Observed |
|---|
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?
Days per bottle cannot be computed for GNC Magnesium 250 mg as of 2026-11-02: servings per container are not filed.
computed| Measure | Value |
|---|---|
| Net contents as filed | 90 Vegetarian Tablet(s) |
| Serving size as filed | 1 Tablet(s) |
| Servings per container | Not filed as of 2026-11-02 |
| Servings per day in the directions | 1 |
| Days per bottle | Not computable as of 2026-11-02 |
| $ per 30 days at one label serving a day | No ranked price as of 2026-11-02 |
| $ per 30 days at 420 mg Daily Value | No ranked price as of 2026-11-02 |
Source · NIH DSLD 224666 · label 2020-06-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "60% Daily Value" mean here, and does it recompute?
The label declares 60% Daily Value; 250 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 60%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 60% | 420 mg | 60% |
Source · NIH DSLD 224666; 21 CFR 101.9 · label 2020-06-24 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain magnesium stearate, what shell is it, and who is it filed for?
GNC Magnesium 250 mg files 9 other ingredients, including magnesium stearate (reference fraction 4.1% magnesium; no quantity filed, so it is not added to the total) and a vegetarian shell.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Microcrystalline Cellulose |
| 2 | Hydroxypropyl Methylcellulose |
| 3 | Polyethylene Glycol |
| 4 | Talc |
| 5 | Magnesium Stearate |
| 6 | Silicon Dioxide |
| 7 | Titanium Dioxide |
| 8 | Vegetable Acetoglycerides |
7 additional rows
| Entry | Filed ingredient or declaration |
|---|---|
| 9 | Polysorbate 80 |
| Shell | vegetarian |
| Target group | Adult (18 - 50 Years) |
| Target group | Kosher |
| Target group | Gluten Free |
| Target group | Dairy Free |
| Target group | Sugar Free |
Source · NIH DSLD 224666 · label 2020-06-24; 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 224666 · label 2020-06-24; 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 224666 · label 2020-06-24; 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 224666 (label 2020-06-24, snapshot 2026-08-10) and the chemistry model of 2026-09-13. 4 gaps remain: Single-salt capacity audit excluded as of 2026-10-17: one salt with a defined elemental fraction is not resolved.; No US retail price matched as of 2026-11-02 (barcode 0 48107 20580 5); A single salt with a defined elemental fraction is unresolved as of 2026-11-02; Servings per container are not filed as of 2026-11-02. The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 224666 |
| Label date | 2020-06-24 |
| Date entered into DSLD | 2020-06-24 |
| Barcode (UPC) as filed | 0 48107 20580 5 |
| Label version · Image difference, same product | NIH DSLD 974 |
| Label version · Image difference, same product | NIH DSLD 25643 |
| Label version · Image difference, same product | NIH DSLD 74989 |
| Distributed by | General Nutrition Corporation, Pittsburgh, PA, USA |
15 additional rows
| Field | As filed |
|---|---|
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
| Precautions re: Children | Keep out of reach of children. |
| Storage | Store in a cool, dry place. |
| Formulation re: Other | Essential for strong bones & teeth Necessary for muscle & nerve function |
| General Statements: All Other Content | 90-day supply |
| FDA Statement of Identity | Dietary Supplement |
| Suggested/Recommended/Usage/Directions | Directions: As a dietary supplement, take one tablet daily. |
| Formulation re: Other | All mineral amounts shown are elemental. Potency verified by GNC procedure #4000. Conforms to USP <2091> for weight. Meets USP <2040> disintegration. |
| Formulation re: Does NOT Contain | No sugar, no starch, no artificial flavors, sodium free, no wheat, gluten free, no corn, no soy, no dairy. |
| Seals/Symbols | Ko Kosher Service |
| Formula re: Kosher | Ko Kosher Service |
| 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 | Tablet or Pill |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 224666 · label 2020-06-24; 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.