Label arithmetic · NIH DSLD 207448
Kirkland Signature Magnesium Citrate 250 mg: the label lists 125 mg, salt or magnesium?
The label lists 125 mg; if that is citrate weight, it holds 14–20 mg of magnesium. No US price matched (Nov 2). Inside: label lines, ingredients.
Kirkland Signature Magnesium Citrate 250 mg declares magnesium without one determinable amount per 2 softgel(s); servings per container are not filed, Capacity audit excluded as of 2026-10-17: the filed amount may describe compound mass rather than elemental magnesium; the elemental amount is unresolved., as of 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 207448, label dated 2019-10-23.
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: not declared
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 citrate compound is in one serving?
The compound mass behind this label cannot be computed as of 2026-11-02: Capacity audit excluded as of 2026-10-17: the filed amount may describe compound mass rather than elemental magnesium; the elemental amount is unresolved.. The filed amounts are listed in the next block.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | Not one amount as of 2026-11-02 |
| Units per serving | 2 |
| Magnesium citrate per serving | Not computable as of 2026-11-02 |
| Magnesium citrate per softgel | 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 |
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 207448 · label 2019-10-23; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Kirkland Signature Magnesium Citrate 250 mg files 1 magnesium line in NIH DSLD 207448; the selected primary line declares no single elemental amount, 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 |
|---|---|---|
| 125 mg | Salt not named in this row; magnesium citrate is taken from the label text | Primary serving |
Source · NIH DSLD 207448 · label 2019-10-23; 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; capsule capacities do not apply to this form, 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 207448 · label 2019-10-23; 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?
Days per bottle cannot be computed for Kirkland Signature Magnesium Citrate 250 mg as of 2026-11-02: servings per container are not filed.
computed| Measure | Value |
|---|---|
| Net contents as filed | 300 Softgel(s) |
| Serving size as filed | 2 Softgel(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 207448 · label 2019-10-23; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "percent Daily Value" mean here, and does it recompute?
The label does not declare a percent Daily Value for magnesium as of 2026-11-02.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| No declaration as of 2026-11-02 |
Source · NIH DSLD 207448; 21 CFR 101.9 · label 2019-10-23 · 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?
Kirkland Signature Magnesium Citrate 250 mg files 10 other ingredients and a gelatin shell, and no magnesium stearate, against 43 of 135 citrate labels that list magnesium stearate.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Magnesium Citrate |
| 2 | Medium Chain Triglycerides |
| 3 | Gelatin |
| 4 | Glycerin |
| 5 | Soy Lecithin |
| 6 | Water |
| 7 | yellow Beeswax |
| 8 | Titanium Dioxide |
5 additional rows
| Entry | Filed ingredient or declaration |
|---|---|
| 9 | Vegetable and Fruit juice |
| 10 | Carmine |
| Shell | gelatin |
| Target group | Adult (18 - 50 Years) |
| Target group | Gluten Free |
Source · NIH DSLD 207448 · label 2019-10-23; 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?
Kirkland Signature has 24 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. Kirkland Signature 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-1739-2014 | 2014-04-09 | Oregon Freeze Dry, Inc. is recalling Kirkland Signature brand Real Sliced Fruit due to contamination of Salmonella. | Terminated |
| F-2077-2014 | 2014-07-09 | Olde Thompson is recalling Kirkland Signature Coarse Ground Malabar Black Pepper because it may be contaminated with Salmonella. | Terminated |
| F-2858-2015 | 2015-07-29 | Marine Harvest is recalling raw, fresh, farmed Chilean Atlantic salmon refrigerated salmon fillets due to potential Listeria monocytogenes contamination. | Terminated |
| F-2857-2015 | 2015-07-29 | Marine Harvest is recalling raw, fresh, farmed Chilean Atlantic salmon refrigerated salmon fillets due to potential Listeria monocytogenes contamination. | Terminated |
| F-1788-2016 | 2016-08-03 | Organic Stir Fry is recalled because it has the potential to be contaminated with Listeria monocytogenes. | 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 207448 · label 2019-10-23; 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 207448 · label 2019-10-23; 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 207448 (label 2019-10-23, snapshot 2026-08-10) and the chemistry model of 2026-09-13. 3 gaps remain: Capacity audit excluded as of 2026-10-17: the filed amount may describe compound mass rather than elemental magnesium; the elemental amount is unresolved.; No US retail price matched as of 2026-11-02; no barcode is filed; 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 207448 |
| Label date | 2019-10-23 |
| Date entered into DSLD | 2019-10-23 |
| Barcode (UPC) as filed | Not filed as of 2026-11-02 |
| Not Present | Costco Wholesale Corporation |
| Claim category as filed | Nutrient |
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
15 additional rows
| Field | As filed |
|---|---|
| General Statements: All Other Content | Higher absorption |
| Formula re: Contains | Magnesium Citrate with 250 mg of Magnesium |
| General Statements: All Other Content | Absorbs better than Magnesium Oxide Helps support essential nerve, muscle & heart function |
| 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. |
| FDA Statement of Identity | Dietary Supplement |
| Suggested/Recommended/Usage/Directions | Suggested use: Take two softgels daily, with a meal. |
| Formulation re: Does NOT Contain | Colors derived from natural sources- No synthetic dyes, no colors added, no artificial flavors, no preservatives, no yeast, gluten free |
| Precautions re: Pregnant or Nursing or Prescription Medications | Warning: If you are pregnant, nursing or taking medications, consult your doctor before use. |
| Precautions re: All Other | Discontinue and consult your doctor if any adverse reactions occur. |
| Formula re: Contains | Kirkland Signature Magnesium Citrate Kirkland Signature Magnesium Citrate is formulated with the more absorbable magnesium citrate form, compared to magnesium oxide. |
| Suggested/Recommended/Usage/Directions | Just 2 convenient softgels per day provide 250 mg of magnesium. |
| General Statements: All Other Content | Helps support healthy bones and teeth Helps support healthy heart, muscle, and nerve function Helps convert food into cellular energy |
| Formula re: Contains | Magnesium is an essential mineral that is involved in over 300 biochemical reactions in the body. Magnesium is the fourth most abundant mineral in the body 50% of total body magnesium found in bone. How much magnesium do I need daily? The Recommended Dietary Allowance (RDA) for adults males (19 to 30 years old) is 400 mg/day and fr adult females (19 to 30 years old) is 310 mg/day. The RDA for adult males (31 years and older) is 420 mg/day and for adult females (31 years and older) is 320 mg/day. What are the food sources of magnesium? Magnesium is part of chlorophyll, the pigment that gives plants their green color. Green leafy vegetables, like spinach, are therefore good sources of magnesium. Whole grains and nuts are also rich sources, including bran cereals, brown rice, peanuts and almonds. Magnesium citrate is a more highly absorbable form than magnesium oxide. |
| Physical state | Softgel Capsule |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 207448 · label 2019-10-23; 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.