Label arithmetic · NIH DSLD 215773
Dr. Clark Store Magnesium Citrate 110 mg
Dr. Clark Store Magnesium Citrate 110 mg declares 330 mg of elemental magnesium as citrate, which needs 681–973 mg of salt per unit — a size 00 capsule or larger; NIH DSLD 215773, label dated 2020-03-24, calculation 2026-09-13.
Mass budget · computed; capsule comparison · modelled
What the declared salt would weigh
Dr. Clark Store Magnesium Citrate 110 mg declares 330 mg of elemental magnesium per serving in NIH DSLD 215773, requiring 2,042.08–2,920.35 mg of magnesium citrate under the salt model calculated 2026-09-13.
| Step | Value | Evidence |
|---|---|---|
| Declared elemental magnesium | 330 mg per serving | observed · label 2020-03-24 |
| Resolved salt | Magnesium citrate · label-row | computed · name resolved from filed text |
| Reference formula | Mg₃(C₆H₅O₇)₂; 451.11 g/mol | computed · chemical reference |
| Elemental fraction | 11.3–16.16% by mass | computed |
| Why the fraction is a range | trimagnesium dicitrate 16.2%; dibasic and hydrated forms as low as 11.3% | modelled · hydrate not specified |
| Compound mass per serving | 2,042.08–2,920.35 mg = 330 mg ÷ elemental fraction | computed |
| Compound mass per discrete unit | 680.69–973.45 mg | computed |
At powder density 0.6–0.8 g/mL, 681 mg of powder requires at least a size 00 capsule (a size 0 holds about 545 mg).
The verdict uses the most favourable reading for the product — the smallest compound mass the label allows. It excludes the shell and other ingredients; their unreported masses are not added as guesses.
Size 0 holds about 545 mg, size 00 about 730 mg, and size 000 about 1,100 mg at powder density 0.6–0.8 g/mL. These are model inputs, not measurements of this product's capsule. Read the mass-budget method.
Label facts and derived measurements
The numbers for this label
Dr. Clark Store Magnesium Citrate 110 mg has 11 published fields below, traced to NIH DSLD 215773 and the 2026-08-10 registry snapshot, with calculations dated 2026-09-13.
| Field | Value | Evidence tier |
|---|---|---|
| NIH DSLD identifier | 215773 | observed |
| Resolved salt | Magnesium citrate | computed |
| Source of the resolved salt | label-row | observed |
| Elemental magnesium per serving (mg) | 330 | observed |
| Servings per container | 33 | observed |
| Elemental magnesium per container (mg) | 10890 | computed |
| Compound mass per discrete unit | 680.69–973.45 mg | computed |
| Capsule fill verdict | needs-00 | modelled |
| Required standard capsule size | 00 | modelled |
| Label date | 2020-03-24 | observed |
| Retail match confidence | unmatched | computed |
Observed means a value transcribed from a label or price observation. Computed means arithmetic or normalization of those inputs. Modelled means the result depends on a stated physical assumption, including capsule capacity. Evidence tiers and their limits.
Source transcription · observed
Magnesium lines as filed
Dr. Clark Store Magnesium Citrate 110 mg retains 1 magnesium-related rows in NIH DSLD 215773, including 1 rows selected for the primary serving, from label 2020-03-24, examined 2026-09-13.
| Filed amount | Serving order | Filed salt / notes | Calculation role |
|---|---|---|---|
| 330 mg | 1 | citrate Magnesium (Form: as Magnesium Citrate) | Selected primary serving |
The elemental amount comes from the selected magnesium line. A salt named under another nutrient does not make that nutrient's quantity an elemental magnesium value. Distinct unresolved primary amounts remain ambiguous; they are not added together.
Package arithmetic · observed inputs, computed totals
What the package works out to
Dr. Clark Store Magnesium Citrate 110 mg works out to 33 days per package at the label's own serving and filed frequency of 1 servings per day, according to label 2020-03-24, calculated 2026-09-13.
| Net contents as filed | 100 Capsule(s) |
|---|---|
| Discrete units in the package | 100 |
| Serving size as filed | 3 Capsule(s) |
| Units per serving | 3 |
| Servings per package | 33 |
| Daily servings in the label instructions | 1 |
| Days per package at the label's own serving | 33 days |
Days = filed servings per container ÷ filed servings per day. If the label gives a frequency range, the largest frequency gives the shortest duration. Cost per serving = observed item price ÷ filed servings; cost per label-day multiplies this by the filed frequency. This follows the label's own instructions; it is package arithmetic, not intake advice.
Benchmark · 19 observed prices in citrate
A same-salt reference for this package
At the median cost per 100 mg observed across 19 citrate labels ($0.1039), a package of this size (10,890 mg elemental in Dr. Clark Store Magnesium Citrate 110 mg) would correspond to $11.31, using observations from 2026-08-10 to 2026-09-11, calculated 2026-09-13. This is a benchmark, not a retailer quote.
| Salt and number of observations | Magnesium citrate · n = 19 |
|---|---|
| Median observed cost per 100 mg | $0.1039 |
| Filed elemental magnesium per package | 10,890 mg |
| Benchmark package equivalent | $11.31 = median EC100 × package elemental mg ÷ 100 |
| Evidence tier | benchmark · calculated 2026-09-13 |
The median is the middle sorted observation, or the average of the two middle observations for an even group. Each label contributes one observation. This value is neither an offer nor an estimate of a specific retailer's current price.
Percent daily value · observed and computed
The label's percent daily value, recomputed
Dr. Clark Store Magnesium Citrate 110 mg files 1 magnesium percent-daily-value entries in NIH DSLD 215773; the check below applies the group-specific references in 21 CFR 101.9 to its 330 mg primary serving, calculated 2026-09-13.
| Group as filed | Declared | Reference | Recomputed | Difference |
|---|---|---|---|---|
| Adults and children 4 or more years of age | 82% | 420 mg | 79% | 3 percentage points |
Percent daily value = declared elemental mg ÷ the group's reference mg × 100, rounded to an integer. The adult and age-four-plus reference is 420 mg. Historical labels can use earlier references; a difference does not establish a filing error. Full-record entries may cover multiple serving sizes, so this table identifies the primary-serving basis explicitly. Group references and interpretation.
Composition · observed
Other ingredients in the filed record
Dr. Clark Store Magnesium Citrate 110 mg lists 1 other ingredients in NIH DSLD 215773, label dated 2020-03-24, examined 2026-09-13.
| Entry | Ingredient |
|---|---|
| 1 | Gelatin Capsules |
Capsule material: gelatin. The material classification follows the filed ingredient names; it is not a test of the shell.
Label declarations · observed
Target groups as filed
Dr. Clark Store Magnesium Citrate 110 mg has 1 target-group entries in NIH DSLD 215773, label dated 2020-03-24, examined 2026-09-13.
| Entry | Filed group |
|---|---|
| 1 | Adult (18 - 50 Years) |
Provenance · observed
Registry record, versions and scanned label
Dr. Clark Store Magnesium Citrate 110 mg is identified by 1 NIH DSLD record, 215773, according to the retained record examined 2026-09-13; the label date is 2020-03-24.
| NIH DSLD label | NIH DSLD 215773 |
|---|---|
| Registry snapshot | 2026-08-10 |
| Label date | 2020-03-24 |
| Physical state | Capsule |
| Barcode as filed | 6 52384 10442 5 |
| Calculation date | 2026-09-13 |
The barcode is retained as an identifier, not as proof of a retail match. A registry version count records the number held; it does not reveal what changed. The label date, registry snapshot and price-observation date describe different events.
Gaps in this record
What is not available for this label
Dr. Clark Store Magnesium Citrate 110 mg has 1 unresolved data gaps in the retained NIH DSLD and price records as of 2026-09-13.
| Entry | Known gap |
|---|---|
| 1 | No confirmed US retail price matched to NIH DSLD 215773 (barcode 6 52384 10442 5) as of 2026-09-13. |
An unmatched retail price describes our matching coverage. It does not establish that a product is unavailable. The elemental cost calculator can apply the same EC100 formula to a price you supply.