Label arithmetic · NIH DSLD 306334
Nutricost Magnesium Citrate 420 mg: 210 mg of magnesium per capsule, 2 capsules a day
210 mg of magnesium per capsule takes 1,300–1,858 mg of citrate; size 000 holds about 1,100 mg (model). Inside: salt weight, capsule size.
Estimated salt mass versus assumed capsule capacity: Nutricost Magnesium Citrate 420 mg implies 1,300–1,858 mg of magnesium citrate per capsule from 420 mg elemental magnesium per serving, above the assumed 1,100 mg capacity of size 000 at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range, calculated 2026-11-02. 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 306334, label dated 2024-02-22.
computed from the filed label
Chart data
| Displayed chart text |
|---|
| 545 mg |
| 730 mg |
| 1,100 mg |
| 1,300–1,858 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: 1,300–1,858 mg per capsule · 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.
Estimated salt mass versus assumed capsule capacity
Estimated salt mass versus assumed capsule capacity: Nutricost Magnesium Citrate 420 mg implies 1,300–1,858 mg of magnesium citrate in each capsule to deliver 420 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: exceeds size 000, read at the most favourable hydration and the most units per serving.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | 420 mg |
| Units per serving | 2 |
| Magnesium citrate per serving | 2,599–3,717 mg |
| Magnesium citrate per capsule | 1,300–1,858 mg |
| Capsule capacity 0 · 00 · 000 | 545 · 730 · 1,100 mg |
| Verdict | Exceeds size 000 |
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 306334 · label 2024-02-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Nutricost Magnesium Citrate 420 mg files 1 magnesium line in NIH DSLD 306334; 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 | Salt not named in this row; magnesium citrate is taken from the label text | Primary serving |
Source · NIH DSLD 306334 · label 2024-02-22; 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?
For this declaration to fit one size 000 capsule, at least 21% of the magnesium would have to come from a salt richer in magnesium, such as magnesium oxide (computed at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range), 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 306334 · label 2024-02-22; 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, Nutricost Magnesium Citrate 420 mg lasts 120 days: 120 servings against 1 serving a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 240 Capsule(s) |
| Serving size as filed | 2 Capsule(s) |
| Servings per container | 120 |
| Servings per day in the directions | 1 |
| Days per bottle | 120 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 306334 · label 2024-02-22; 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 306334; 21 CFR 101.9 · label 2024-02-22 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain magnesium stearate, what shell is it, and who is it filed for?
Nutricost Magnesium Citrate 420 mg files 4 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, against 43 of 135 citrate labels that list magnesium stearate.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Hypromellose |
| 2 | Magnesium Stearate |
| 3 | Microcrystalline Cellulose |
| 4 | Silica |
| Shell | vegetarian |
| Target group | Vegetarian |
| Target group | Adult (18 - 50 Years) |
| Target group | Gluten Free |
Source · NIH DSLD 306334 · label 2024-02-22; 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?
Nutricost has 0 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. Nutricost 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 |
|---|---|---|---|
| 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 306334 · label 2024-02-22; 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 210 mg per unit, compared side by side on price and capsule verdict.
computed| Label | Elemental per unit | Price | Verdict |
|---|---|---|---|
| Solgar Magnesium Citrate (DSLD 219453) | 210 mg | $15.29 · 2026-11-02 | Capsule sizes do not apply |
| Solgar Magnesium Citrate (DSLD 219466) | 210 mg | $15.29 · 2026-11-02 | Capsule sizes do not apply |
| Solgar Magnesium Citrate (DSLD 241135) | 210 mg | $15.29 · 2026-11-02 | Capsule sizes do not apply |
| Solgar Magnesium Citrate (DSLD 241141) | 210 mg | No price | Capsule sizes do not apply |
| Solgar Magnesium Citrate (DSLD 241142) | 210 mg | No price | Capsule sizes do not apply |
| Vitabase Magnesium Citrate 200 mg | 200 mg | No price | Capsule sizes do not apply |
Source · NIH DSLD 306334 · label 2024-02-22; 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 306334 (label 2024-02-22, 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 10014 67190 1). The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 306334 |
| Scanned label (PDF) | Label 306334 scan |
| Label date | 2024-02-22 |
| Date entered into DSLD | 2024-02-22 |
| Barcode (UPC) as filed | 8 10014 67190 1 |
| Label version · Package size difference, same product | NIH DSLD 272744 |
| Distributed by | Nutricost, Vineyard, UT |
| Claim category as filed | Nutrient |
18 additional rows
| Field | As filed |
|---|---|
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
| Suggested/Recommended/Usage/Directions | Suggested use: As a dietary supplement, take 2 capsules daily with 8-12 oz of water or as directed by your healthcare professional. |
| Formulation re: Other | Third party tested |
| Formulation re: Does NOT Contain | Non-GMO Gluten-free |
| Precautions re: Children | Warning: For healthy individuals 18 years and older. Keep out of reach of children. |
| Precautions re: Pregnant or Nursing or Prescription Medications | Consult a healthcare professional prior to use if you are pregnant or nursing, taking medication, or have a medical condition. |
| Precautions re: All Other | Do not use if safety seal is broken or missing. |
| Storage | Notice: Store in a cool, dry place. |
| Formulation re: Other | Made and quality tested in the USA with globally sourced ingredients. |
| Formula re: Contains | 420 mg magnesium per serving |
| FDA Statement of Identity | Dietary Supplement |
| Seals/Symbols | Nutricost Quality Guaranteed Vegetarian Product GMP Compliant Facility |
| Formulation re: Vegetarian/Vegan | Vegetarian product |
| 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: Does NOT Contain | Non-GMO product |
| Physical state | Capsule |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 306334 · label 2024-02-22; 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.