Label arithmetic · NIH DSLD 338190
SuperiorLabs Magnesium Citrate: 100 mg of magnesium per capsule, 2 capsules a day
100 mg of magnesium per capsule; the label's 2 capsules a day give 200 mg. No US price matched (Nov 2). Inside: salt weight, capsule size.
SuperiorLabs Magnesium Citrate declares 200 mg of elemental magnesium per serving as citrate, which needs 619–885 mg of magnesium citrate in each capsule, against 730 mg in a size 00 capsule at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range: it needs size 00 or larger. No US retail price matched as of 2026-11-02; 17 of the 135 citrate labels in this registry have a matched price. NIH DSLD 338190, label dated 2025-08-22.
computed from the filed label
Chart data
| Displayed chart text |
|---|
| 545 mg |
| 730 mg |
| 1,100 mg |
| 619–885 mg of citrate per capsule |
Data release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-10-19 · chemistry 2026-10-17
Mass: 619–885 mg per capsule · Price: none matched · % DV: 48% vs 48%
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 200 mg of citrate actually fit in one capsule, or do I need more than one?
Estimated salt mass versus assumed capsule capacity: SuperiorLabs Magnesium Citrate implies 619–885 mg of magnesium citrate in each capsule to deliver 200 mg of elemental magnesium, against 1,100 mg in the largest standard capsule (size 000) at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range. Verdict: needs size 00, read at the most favourable hydration and the most units per serving.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | 200 mg |
| Units per serving | 2 |
| Magnesium citrate per serving | 1,238–1,770 mg |
| Magnesium citrate per capsule | 619–885 mg |
| Capsule capacity 0 · 00 · 000 | 545 · 730 · 1,100 mg |
| Verdict | Needs size 00 |
The filed salt can have more than one hydration state (trimagnesium dicitrate 16.2%; dibasic and hydrated forms as low as 11.3%), so the compound mass is a range.
Source · NIH DSLD 338190 · label 2025-08-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
SuperiorLabs Magnesium Citrate files 1 magnesium line in NIH DSLD 338190; the selected primary line declares 200 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 |
|---|---|---|
| 200 mg | Salt not named in this row; magnesium citrate is taken from the label text | Primary serving |
Source · NIH DSLD 338190 · label 2025-08-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Does this label's citrate claim hold up, or could the magnesium come from another source?
The label names one magnesium form, citrate, resolved from the full NIH DSLD record text; at that salt the declaration is within the assumed size 000 capacity at powder density 0.8 g/mL, compared with oxide, the salt richest in magnesium at 60.3%.
computed with assumption| Form named on the label | Elemental fraction | Source |
|---|---|---|
| Magnesium citrate | 11.3–16.2% | full NIH DSLD record text |
Source · NIH DSLD 338190 · label 2025-08-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Is this a good price for the elemental magnesium I'm actually getting?
No US retail price is matched to this label as of 2026-11-02; 17 of 135 citrate labels have one, against a median of $0.1159 per 100 mg among 12 ranked citrate offers.
computed
Chart data
| Displayed chart text |
|---|
| n=12 |
| P25 $0.0843 |
| P75 $0.1469 |
| median $0.1159 |
| Rank | Label | Per 100 mg | Observed |
|---|---|---|---|
| 1 | Best Naturals Magnesium Citrate 200 mg | $0.0344 | 2026-11-02 |
| 2 | Solgar Magnesium Citrate | $0.0607 | 2026-11-02 |
| 3 | LES Labs Magnesium Citrate | $0.0777 | 2026-11-02 |
| 4 | Bluebonnet Magnesium Citrate | $0.0865 | 2026-11-02 |
| 5 | Solaray Magnesium Citrate 400 mg | $0.0868 | 2026-11-02 |
| Median | 12 ranked citrate offers | $0.1159 | 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, SuperiorLabs Magnesium Citrate lasts 60 days: 60 servings against 1 serving a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 120 Vegetable 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 338190 · label 2025-08-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "48% Daily Value" mean here, and does it recompute?
The label declares 48% Daily Value; 200 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 48%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 48% | 420 mg | 48% |
Source · NIH DSLD 338190; 21 CFR 101.9 · label 2025-08-22 · 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?
SuperiorLabs Magnesium Citrate files 2 other ingredients and a vegetarian shell, and no magnesium stearate, against 43 of 135 citrate labels that list magnesium stearate.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Cellulose |
| 2 | Rice Concentrate |
| Shell | vegetarian |
| Target group | Adult (18 - 50 Years) |
Source · NIH DSLD 338190 · label 2025-08-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What has research measured about citrate, and about side effects?
10 studies in the PubMed-checked registry measured outcomes involving citrate; 1 mention gastrointestinal or adverse outcomes. They measured the salt, not this label.
measured| Year | Study | PubMed |
|---|---|---|
| 2025 | Comparing the Bioavailability of Two Seawater-Derived Magnesium Preparations. | 40955524 |
| 2024 | Comparative Clinical Study on Magnesium Absorption and Side Effects After Oral Intake of Microencapsulated Magnesium (MAGSHAPE™ Microcapsules) Versus Other Magnesium Sources. | 39770988 |
| 2022 | Effects of short-term magnesium supplementation on ionized, total magnesium and other relevant electrolytes levels. | 35041150 |
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?
SuperiorLabs has 0 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. SuperiorLabs 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 338190 · label 2025-08-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which labels are closest to this one, with the same salt and dose?
6 labels use the same resolved citrate within ±10% of this label's 100 mg per unit, compared side by side on price and capsule verdict.
computed| Label | Elemental per unit | Price | Verdict |
|---|---|---|---|
| XYMOGEN Magnesium Citrate (DSLD 6139) | 100 mg | $36.99 · 2026-11-02 | Needs size 00 |
| Vitamin World Magnesium Citrate | 100 mg | No price | Needs size 00 |
| XYMOGEN Magnesium Citrate (DSLD 50041) | 100 mg | $36.99 · 2026-11-02 | Needs size 00 |
| Spring Valley Rapid-Release Magnesium Citrate 100 mg | 100 mg | No price | Needs size 00 |
| H-E-B Magnesium Citrate 100 mg | 100 mg | No price | Needs size 00 |
| Genestra Brands Magnesium | 100 mg | No price | Needs size 00 |
Source · NIH DSLD 338190 · label 2025-08-22; 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 338190 (label 2025-08-22, snapshot 2026-08-10) and the chemistry model of 2026-09-13. 1 gap remain: No US retail price matched as of 2026-11-02 (barcode 8 50569 00626 1). The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 338190 |
| Scanned label (PDF) | Label 338190 scan |
| Label date | 2025-08-22 |
| Date entered into DSLD | 2025-08-22 |
| Barcode (UPC) as filed | 8 50569 00626 1 |
| Label version · Image difference, same product | NIH DSLD 201431 |
| Label version · Image difference, same product | NIH DSLD 74475 |
| Label version · Image difference, same product | NIH DSLD 227937 |
20 additional rows
| Field | As filed |
|---|---|
| Manufactured exclusively for | Superior Labs, LLC., Park City, UT |
| Claim category as filed | Nutrient |
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
| Formula re: Contains | Magnesium is a mineral that supports proper function of a number of bodily systems, including supporting healthy bones, teeth, and healthy muscle function. Superior Labs' Magnesium Citrate is a pure and natural source of elemental magnesium. |
| Formulation re: Does NOT Contain | Our capsules contain absolutely no magnesium stearate, dioxides, or any potentially harmful ingredients of any kind. |
| Suggested/Recommended/Usage/Directions | Suggested use: As a dietary supplement, adults take 2 capsules per day or as directed by your health care practitioner. Best when taken with a meal. |
| Precautions re: All Other | Caution: Do not exceed recommended dosage. Do not use if safety seal is damaged or missing. |
| Precautions re: Pregnant or Nursing or Prescription Medications | Please consult a physician before consuming this product if you are pregnant or nursing, taking medication or have a medical condition. |
| Precautions re: Children | Not intended for use by individuals under the age of 18. Keep out of reach of children. |
| Storage | Store in a cool, dry place. |
| Seals/Symbols | Metal Safe Heavy Metal Tested GMP Certified Facility Manufactured in the USA with globally sourced ingredients |
| Formulation re: Does NOT Contain | Metal Safe Heavy Metal Tested |
| 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. |
| Formulation re: Other | Optimal absorption Nervous system support Healthy bones Maintains energy Healthy muscle function Powerful formulation This product is formulated, developed and manufactured in an FDA-registered and GMP-certified facility and is 3rd party inspected by a leading compliance authority for superior quality assurance. |
| Formula re: Contains | Essential mineral |
| FDA Statement of Identity | Dietary Supplement |
| Formulation re: Does NOT Contain | Does not contain: magnesium stearate, dioxides or any potentially harmful ingredients of any kind. |
| Physical state | Capsule |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 338190 · label 2025-08-22; 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.