Label arithmetic · NIH DSLD 297224
Kirkman Magnesium Malate: 160 mg of magnesium per capsule, 1–3 capsules a day
160 mg of magnesium per capsule; the label's 1–3 capsules a day give 160–480 mg. No US price matched (Nov 2). Inside: salt weight, capsule size.
Kirkman Magnesium Malate declares 160 mg of elemental magnesium per serving as malate, which needs 343–422 mg of magnesium malate in each capsule, against 545 mg in a size 0 capsule at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range: it fits a size 0 capsule, the smallest of the three sizes compared here. No US retail price matched as of 2026-11-02; 2 of the 20 malate labels in this registry have a matched price. NIH DSLD 297224, label dated 2023-09-25.
computed from the filed label
Chart data
| Displayed chart text |
|---|
| 545 mg |
| 730 mg |
| 1,100 mg |
| 343–422 mg of malate per capsule |
Data release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-10-19 · chemistry 2026-10-17
Mass: 343–422 mg per capsule · Price: none matched · % DV: 38% vs 38%
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 160 mg of malate actually fit in one capsule, or do I need more than one?
Estimated salt mass versus assumed capsule capacity: Kirkman Magnesium Malate implies 343–422 mg of magnesium malate in each capsule to deliver 160 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: fits size 0, read at the most favourable hydration and the most units per serving.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | 160 mg |
| Units per serving | 1–3 |
| Magnesium malate per serving | 1,030–1,267 mg |
| Magnesium malate per capsule | 343–422 mg |
| Capsule capacity 0 · 00 · 000 | 545 · 730 · 1,100 mg |
| Verdict | Fits size 0 |
The filed salt can have more than one hydration state (anhydrous 15.54% or dihydrate 12.63% (192.41 g/mol)), so the compound mass is a range.
Source · NIH DSLD 297224 · label 2023-09-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Kirkman Magnesium Malate files 1 magnesium line in NIH DSLD 297224; the selected primary line declares 160 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 |
|---|---|---|
| 160 mg | Salt not named in this row; magnesium malate is taken from the label text | Primary serving |
Source · NIH DSLD 297224 · label 2023-09-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Does this label's malate claim hold up, or could the magnesium come from another source?
The label names one magnesium form, malate, 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 malate | 12.6–15.5% | full NIH DSLD record text |
Source · NIH DSLD 297224 · label 2023-09-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Is this a good price for the elemental magnesium I'm actually getting?
No US retail price is matched to this label as of 2026-11-02; 2 of 20 malate labels have one, against a median of $0.1052 per 100 mg among 4 ranked malate offers.
computed
Chart data
| Displayed chart text |
|---|
| n=4, band unstable |
| P25 $0.0739 |
| P75 $0.1402 |
| median $0.1052 |
| Rank | Label | Per 100 mg | Observed |
|---|---|---|---|
| 1 | Seeking Health Magnesium Malate 500 mg | $0.0460 | 2026-11-02 |
| 2 | BulkSupplements.com Magnesium Malate Capsules 400 mg | $0.0832 | 2026-11-02 |
| 3 | Trace Minerals Research Stress-X Magnesium Powder Lemon Lime | $0.1272 | 2026-11-02 |
| 4 | Thorne Calcium-Magnesium Malate | $0.1792 | 2026-11-02 |
| Median | 4 ranked malate offers | $0.1052 | 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, Kirkman Magnesium Malate lasts 120 days: 120 servings against 1 serving a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 120 Capsule(s) |
| Serving size as filed | 1–3 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 297224 · label 2023-09-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "38% Daily Value" mean here, and does it recompute?
The label declares 38% Daily Value; 160 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 38%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 38% | 420 mg | 38% |
Source · NIH DSLD 297224; 21 CFR 101.9 · label 2023-09-25 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain magnesium stearate, what shell is it, and who is it filed for?
Kirkman Magnesium Malate 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, against 12 of 20 malate labels that list magnesium stearate.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Hypromellose |
| 2 | Water |
| 3 | Magnesium Stearate |
| Shell | vegetarian |
| Target group | Adult (18 - 50 Years) |
| Target group | Gluten Free |
| Target group | Dairy Free |
Source · NIH DSLD 297224 · label 2023-09-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What has research measured about malate, and about side effects?
3 studies in the PubMed-checked registry measured outcomes involving malate; none reports a gastrointestinal outcome as of 2026-11-02. They measured the salt, not this label.
measured| Year | Study | PubMed |
|---|---|---|
| 2020 | Dose-Dependent Absorption Profile of Different Magnesium Compounds | 30761462 |
| 2019 | Timeline (Bioavailability) of Magnesium Compounds in Hours: Which Magnesium Compound Works Best? | 29679349 |
| 2018 | Scottsdale Magnesium Study: Absorption, Cellular Uptake, and Clinical Effectiveness of a Timed-Release Magnesium Supplement in a Standard Adult Clinical Population. | 29425476 |
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?
Kirkman has 13 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. Kirkman 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-0790-2014 | 2013-12-25 | Firm is recalling dietary supplements containing a raw material which may contain >0.3 ppb chloramphenicol | Terminated |
| F-0757-2014 | 2013-12-25 | Firm is recalling dietary supplements containing a raw material which may contain >0.3 ppb chloramphenicol | Terminated |
| F-0762-2014 | 2013-12-25 | Firm is recalling dietary supplements containing a raw material which may contain >0.3 ppb chloramphenicol | Terminated |
| F-0747-2014 | 2013-12-25 | Firm is recalling dietary supplements containing a raw material which may contain >0.3 ppb chloramphenicol | Terminated |
| F-0792-2014 | 2013-12-25 | Firm is recalling dietary supplements containing a raw material which may contain >0.3 ppb chloramphenicol | 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 297224 · label 2023-09-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which labels are closest to this one, with the same salt and dose?
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 297224 · label 2023-09-25; 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 297224 (label 2023-09-25, 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 12325 02141 3). The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 297224 |
| Scanned label (PDF) | Label 297224 scan |
| Label date | 2023-09-25 |
| Date entered into DSLD | 2023-09-25 |
| Barcode (UPC) as filed | 8 12325 02141 3 |
| Label version · Image difference, same product | NIH DSLD 24673 |
| Manufactured exclusively by | Kirkman, Lake Oswego, OR |
| Claim category as filed | All Other |
13 additional rows
| Field | As filed |
|---|---|
| Storage | Important: Store in a cool dry place and tightly capped. |
| Precautions re: Children | Keep out of the reach of children. |
| Precautions re: All Other | Caution: Magnesium supplements can cause changes in stool consistency and bowel habits. If this occurs, discontinue use and discuss this matter with your physician. |
| Formulation re: Does NOT Contain | Free of: Milk, eggs, fish, shellfish, tree nuts, peanuts, wheat or soy. |
| Seals/Symbols | Ultra Tested cGMP Current Good Manufacturing Practice Consistent Quality |
| Brand IP Statement(s) re: (c), (TM), (SM) | Kirkman and Ultra Tested are Registered in U.S. Patent and Trademark Office. |
| Formulation re: Other | Hypoallergenic |
| Formulation re: Does NOT Contain | Gluten-free |
| FDA Statement of Identity | Dietary Supplement |
| Suggested/Recommended/Usage/Directions | Suggested Use: One to three capsules daily or as directed by a physician. |
| General Statements: All Other Content | 503.694.1600 |
| Physical state | Capsule |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 297224 · label 2023-09-25; 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.