Label arithmetic · NIH DSLD 328870
Qunol Minerals Extra Strength Magnesium 420 mg: 210 mg of magnesium per capsule, 2 capsules a day
210 mg of magnesium per capsule; the label's 2 capsules a day give 420 mg. No US price matched (Nov 2). Inside: label lines, ingredients.
Qunol Minerals Extra Strength Magnesium 420 mg declares 420 mg of elemental magnesium per 2 capsule(s); the magnesium salt is not resolved from the filed record, Single-salt capacity audit excluded as of 2026-10-17: buffered, complex, blend or asporotate wording leaves the composition unresolved., as of 2026-11-02. No US retail price matched as of 2026-11-02. NIH DSLD 328870, label dated 2025-05-21.
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: 100% vs 100%
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.
Will 420 mg of magnesium actually fit in one capsule, or do I need more than one?
The compound mass behind this label cannot be computed as of 2026-11-02: Single-salt capacity audit excluded as of 2026-10-17: buffered, complex, blend or asporotate wording leaves the composition unresolved.. The filed amounts are listed in the next block. Lower bound, not a measurement: even if all 420 mg of magnesium per serving came from magnesium oxide (60.3% magnesium), the richest magnesium salt used in supplements, because "buffered" on the label does not pin down the form, each of the 2 capsules would need at least 348 mg of compound, so at this bound it needs at least a size 0 capsule (about 545 mg at 0.8 g/mL); the actual mix of forms may need more.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | 420 mg |
| Units per serving | 2 |
| Magnesium salt per serving | Not computable as of 2026-11-02 |
| Magnesium salt per capsule | 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 328870 · label 2025-05-21; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Qunol Minerals Extra Strength Magnesium 420 mg files 1 magnesium line in NIH DSLD 328870; the selected primary line declares 420 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 |
|---|---|---|
| 420 mg | buffered | Primary serving |
Source · NIH DSLD 328870 · label 2025-05-21; 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?
No single magnesium salt is resolved from the filed record as of 2026-11-02, so the source of the declared magnesium cannot be checked against capsule capacity, compared with oxide, the salt richest in magnesium at 60.3%.
computed with assumption| Form named on the label | Elemental fraction | Source |
|---|---|---|
| No form named as of 2026-11-02 | No defined fraction | named on label |
Source · NIH DSLD 328870 · label 2025-05-21; 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?
At the label's own serving, Qunol Minerals Extra Strength Magnesium 420 mg lasts 60 days: 60 servings against 1 serving a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 120 Capsule(s) |
| Serving size as filed | 2 Capsule(s) |
| Servings per container | 60 |
| Servings per day in the directions | 1 |
| Days per bottle | 60 days |
| $ 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 328870 · label 2025-05-21; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "100% Daily Value" mean here, and does it recompute?
The label declares 100% Daily Value; 420 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 100%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 100% | 420 mg | 100% |
Source · NIH DSLD 328870; 21 CFR 101.9 · label 2025-05-21 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain magnesium stearate, what shell is it, and who is it filed for?
Qunol Minerals Extra Strength Magnesium 420 mg files 3 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 | Hydroxypropyl Methylcellulose |
| 2 | Silicon Dioxide |
| 3 | Magnesium Stearate |
| Shell | vegetarian |
| Target group | Vegan |
| Target group | Vegetarian |
| Target group | Adult (18 - 50 Years) |
| Target group | Gluten Free |
2 additional rows
| Entry | Filed ingredient or declaration |
|---|---|
| Target group | Dairy Free |
| Target group | Sugar Free |
Source · NIH DSLD 328870 · label 2025-05-21; 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?
Qunol Minerals has 0 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. Qunol Minerals has no FDA CAERS adverse event report on record at brand level as of 2026-10-19 (143 of 273 brands in this registry have at least one CAERS report).
measured| Recall | Date | Reason | Status |
|---|---|---|---|
| No recall record as of 2026-10-19 |
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 328870 · label 2025-05-21; 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 328870 · label 2025-05-21; 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 328870 (label 2025-05-21, snapshot 2026-08-10) and the chemistry model of 2026-09-13. 3 gaps remain: Single-salt capacity audit excluded as of 2026-10-17: buffered, complex, blend or asporotate wording leaves the composition unresolved.; No US retail price matched as of 2026-11-02 (barcode 8 98440 00176 9); 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 328870 |
| Scanned label (PDF) | Label 328870 scan |
| Label date | 2025-05-21 |
| Date entered into DSLD | 2025-05-21 |
| Barcode (UPC) as filed | 8 98440 00176 9 |
| Manufactured for and Distributed by | Quten Research Institute, LLC, Pine Brook, NJ |
| Claim category as filed | Nutrient |
| Claim category as filed | All Other |
18 additional rows
| Field | As filed |
|---|---|
| Claim category as filed | Structure/Function |
| Precautions re: Children | Keep out of reach of children |
| Precautions re: Pregnant or Nursing or Prescription Medications | If you are pregnant or nursing, seek the advise of a health professional before using this product. |
| Storage | To preserve quality and freshness, keep bottle tightly closed. Store in a cool, dry place. |
| Precautions re: All Other | Tamper resistant: Do not use if safety seal over cap is broken or missing. To report a serious adverse event or to obtain product information contact 1-877-290-2621. |
| General Statements: All Other Content | Money back guaranteed. Terms & conditions apply. See Qunol.com |
| Formulation re: Other | Manufactured in a cGMP compliant USA facility. |
| Brand IP Statement(s) re: (c), (TM), (SM) | Qunol is a registered trademark of Quten Research Institute, LLC |
| Formulation re: Does NOT Contain | Gluten free Non-GMO No artificial colors |
| Formulation re: Vegetarian/Vegan | Vegan |
| Formulation re: Other | High absorption Compared to magnesium oxide capsules Extra Strength Magnesium Compared to Qunol Magnesium 200 mg gummies |
| Formulation re: Other | Promotes nerve, bone & muscle health |
| FDA Statement of Identity | Dietary Supplement |
| Suggested/Recommended/Usage/Directions | Directions: Adults take two (2) capsules daily with food, or as recommended by your healthcare professional. |
| Formulation re: Does NOT Contain | Free of: milk and milk by-products, egg and egg by-products, fish and fish by-products, shellfish or shellfish by-products, wheat and wheat by-products, and peanuts or peanut by-products. Gluten free. Sugar free. |
| 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 | Capsule |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 328870 · label 2025-05-21; 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.