Label arithmetic · NIH DSLD 235550
NutriCology Magnesium Citrate: 170 mg of magnesium per capsule, 1–3 capsules a day, from $5.30 a month
170 mg of magnesium per capsule; the label's 1–3 capsules a day cost from $5.30 a month (Amazon, Nov 2). Inside: salt weight, capsule size, price rank.
NutriCology Magnesium Citrate declares 170 mg of elemental magnesium per serving as citrate, which needs 1,052–1,504 mg of magnesium citrate in each capsule, 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: it fits only that size. Observed at $0.1039 per 100 mg, rank 6 of 12 ranked citrate offers (1 = lowest price per 100 mg), percentile 50 (lower = lower price). NIH DSLD 235550, label dated 2020-09-25.
computed from the filed label
Chart data
| Displayed chart text |
|---|
| 545 mg |
| 730 mg |
| 1,100 mg |
| 1,052–1,504 mg of citrate per capsule |
Data release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-11-02 · chemistry 2026-10-17
Mass: 1,052–1,504 mg per capsule · Price: $0.1039 per 100 mg · % DV: 40% vs 40%
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 170 mg of citrate actually fit in one capsule, or do I need more than one?
Estimated salt mass versus assumed capsule capacity: NutriCology Magnesium Citrate implies 1,052–1,504 mg of magnesium citrate in each capsule to deliver 170 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 000, read at the most favourable hydration and the most units per serving.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | 170 mg |
| Units per serving | 1 |
| Magnesium citrate per serving | 1,052–1,504 mg |
| Magnesium citrate per capsule | 1,052–1,504 mg |
| Capsule capacity 0 · 00 · 000 | 545 · 730 · 1,100 mg |
| Verdict | Needs 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 235550 · label 2020-09-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
NutriCology Magnesium Citrate files 1 magnesium line in NIH DSLD 235550; the selected primary line declares 170 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 |
|---|---|---|
| 170 mg | citrate · Magnesium (Form: as Magnesium Citrate) | Primary serving |
Source · NIH DSLD 235550 · label 2020-09-25; 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 filed magnesium line; 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% | filed magnesium line |
Source · NIH DSLD 235550 · label 2020-09-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Is this a good price for the elemental magnesium I'm actually getting?
NutriCology Magnesium Citrate costs $0.1039 per 100 mg of elemental magnesium at the price observed 2026-11-02, rank 6 of 12 ranked citrate offers (1 = lowest price per 100 mg), percentile 50 (lower = lower price), against a same-salt median of $0.1159; prices observed 2026-10-26 to 2026-11-02. First observed 2026-10-26 at $31.79, latest 2026-11-02 at $31.79, 2 observations.
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 |
| 6 | NutriCology Magnesium Citrate (this label) | $0.1039 | 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, NutriCology Magnesium Citrate lasts 60–180 days: 180 servings against 1–3 servings a day in the filed directions. from $5.30 a month at the label's suggested use (1–3 capsules a day) and $13.09 at the 420 mg Daily Value reference (21 CFR 101.9); arithmetic on the label, not intake advice.
computed| Measure | Value |
|---|---|
| Net contents as filed | 180 Vegetarian Capsule(s) |
| Serving size as filed | 1 Capsule(s) |
| Servings per container | 180 |
| Servings per day in the directions | 1–3 |
| Days per bottle | 60–180 days |
| Cost a month at the label suggested use | from $5.30 a month at the label's suggested use (1–3 capsules a day) |
| $ per 30 days at 420 mg Daily Value | $13.09 |
Source · NIH DSLD 235550 · label 2020-09-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "40% Daily Value" mean here, and does it recompute?
The label declares 40% Daily Value; 170 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 40%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 40% | 420 mg | 40% |
Source · NIH DSLD 235550; 21 CFR 101.9 · label 2020-09-25 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain magnesium stearate, what shell is it, and who is it filed for?
NutriCology Magnesium Citrate 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 | Hydroxypropyl Methylcellulose |
| 2 | Microcrystalline Cellulose |
| 3 | Magnesium Stearate |
| 4 | Silicon Dioxide |
| Shell | vegetarian |
| Target group | Adult (18 - 50 Years) |
Source · NIH DSLD 235550 · label 2020-09-25; 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?
NutriCology has 0 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. NutriCology 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?
The same filed formulation appears on 4 labels from 2 brands; observed prices across them differ by an amount not yet observable.
computed| Label | Brand | Price per 100 mg |
|---|---|---|
| Allergy Research Group Magnesium Citrate | Allergy Research Group | No price |
| Allergy Research Group Magnesium Citrate | Allergy Research Group | No price |
| NutriCology Magnesium Citrate | NutriCology | No price |
| NutriCology Magnesium Citrate | NutriCology | $0.1039 |
Source · NIH DSLD 235550 · label 2020-09-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which labels are closest to this one, with the same salt and dose?
5 labels use the same resolved citrate within ±10% of this label's 170 mg per unit, compared side by side on price and capsule verdict.
computed| Label | Elemental per unit | Price | Verdict |
|---|---|---|---|
| Allergy Research Group Magnesium Citrate (DSLD 233067) | 170 mg | No price | Needs size 000 |
| Allergy Research Group Magnesium Citrate (DSLD 233300) | 170 mg | No price | Needs size 000 |
| NutriCology Magnesium Citrate | 170 mg | No price | Needs size 000 |
| Metabolic Maintenance Magnesium Citrate (DSLD 24926) | 167 mg | No price | Needs size 000 |
| Metabolic Maintenance Magnesium Citrate (DSLD 25020) | 167 mg | No price | Needs size 000 |
Source · NIH DSLD 235550 · label 2020-09-25; 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 235550 (label 2020-09-25, snapshot 2026-08-10), a price observed 2026-11-02 and the chemistry model of 2026-09-13. No data gap remains for the computed fields. The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 235550 |
| Label date | 2020-09-25 |
| Date entered into DSLD | 2020-09-25 |
| Barcode (UPC) as filed | 7 13947 56660 6 |
| Label version · Package size difference, same product | NIH DSLD 183861 |
| Label version · Package size difference, same product | NIH DSLD 234782 |
| Label version · Package size difference, same product | NIH DSLD 199602 |
| Label version · Image difference, same product | NIH DSLD 199602 |
17 additional rows
| Field | As filed |
|---|---|
| Label version · Package size difference, same product | NIH DSLD 101482 |
| Formulated exclusively for | NutriCology, South Salt Lake, UT |
| Claim category as filed | Nutrient |
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
| Formula re: Contains | Magnesium in the citrate form. |
| Suggested/Recommended/Usage/Directions | Suggested Use As a dietary supplement, 1 capsule one to three times daily between meals, or as directed by a healthcare practitioner. |
| Precautions re: All Other | High doses of magnesium can have a laxative effect. |
| Precautions re: Pregnant or Nursing or Prescription Medications | Contraindicated with use of aluminum containing drugs. |
| Storage | Store in a cool, dry place, tightly capped. |
| FDA Disclaimer Statement | This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease. |
| General Statements: All Other Content | NutriCology Innovative Nutrition |
| Formula re: Contains | Pure, well-absorbed Magnesium |
| Formulation re: Other | Hypoallergenic |
| FDA Statement of Identity | Dietary Supplement |
| Physical state | Capsule |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 235550 · label 2020-09-25; 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.