Label arithmetic · NIH DSLD 235550
NutriCology Magnesium Citrate
NutriCology Magnesium Citrate declares 170 mg of elemental magnesium as citrate, which needs 1,052–1,504 mg of salt per unit — a size 000 capsule or larger; NIH DSLD 235550, label dated 2020-09-25, calculation 2026-09-13.
Mass budget · computed; capsule comparison · modelled
What the declared salt would weigh
NutriCology Magnesium Citrate declares 170 mg of elemental magnesium per serving in NIH DSLD 235550, requiring 1,051.98–1,504.42 mg of magnesium citrate under the salt model calculated 2026-09-13.
| Step | Value | Evidence |
|---|---|---|
| Declared elemental magnesium | 170 mg per serving | observed · label 2020-09-25 |
| 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 | 1,051.98–1,504.42 mg = 170 mg ÷ elemental fraction | computed |
| Compound mass per discrete unit | 1,051.98–1,504.42 mg | computed |
At powder density 0.6–0.8 g/mL, 1,052 mg of powder requires the largest standard size, 000 (holds about 1,100 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
NutriCology Magnesium Citrate has 14 published fields below, traced to NIH DSLD 235550 and the 2026-08-10 registry snapshot, with calculations dated 2026-09-13.
| Field | Value | Evidence tier |
|---|---|---|
| NIH DSLD identifier | 235550 | observed |
| Resolved salt | Magnesium citrate | computed |
| Source of the resolved salt | label-row | observed |
| Elemental magnesium per serving (mg) | 170 | observed |
| Servings per container | 180 | observed |
| Elemental magnesium per container (mg) | 30600 | computed |
| Compound mass per discrete unit | 1,051.98–1,504.42 mg | computed |
| Capsule fill verdict | needs-000 | modelled |
| Required standard capsule size | 000 | modelled |
| Label date | 2020-09-25 | observed |
| Retail match confidence | confirmed | computed |
| Observed container price (USD) | 31.79 | observed |
| Price observation date | 2026-09-11 | observed |
| Cost per 100 mg elemental (USD) | 0.1039 | 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
NutriCology Magnesium Citrate retains 1 magnesium-related rows in NIH DSLD 235550, including 1 rows selected for the primary serving, from label 2020-09-25, examined 2026-09-13.
| Filed amount | Serving order | Filed salt / notes | Calculation role |
|---|---|---|---|
| 170 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.
Within one salt · computed from observed prices
Cost per 100 mg within citrate
NutriCology Magnesium Citrate's $0.1039 per 100 mg of elemental magnesium is at percentile 53 among 19 citrate labels with observed prices, using confirmed gold-set matches observed 2026-08-10 to 2026-09-11, calculated 2026-09-13.
| Observed item price · Amazon | $31.79 on 2026-09-11 |
|---|---|
| Cost per 100 mg elemental | $0.1039 |
| Observed prices in citrate | 19 confirmed matches |
| Percentile | 53 |
| Match confidence | confirmed |
Percentile = 100 × the number of prices at or below this EC100 ÷ the number of observed prices in this salt, rounded to an integer. Ties receive the same percentile. The comparison includes this label; a high percentile means higher observed cost. Price is the dated item observation, excluding tax, shipping, coupons and subscriptions.
Package arithmetic · observed inputs, computed totals
What the package works out to
NutriCology Magnesium Citrate works out to 60–180 days per package at the label's own serving and filed frequency of 1–3 servings per day, according to label 2020-09-25, calculated 2026-09-13.
| Net contents as filed | 180 Vegetarian Capsule(s) |
|---|---|
| Discrete units in the package | 180 |
| Serving size as filed | 1 Capsule(s) |
| Units per serving | 1 |
| Servings per package | 180 |
| Daily servings in the label instructions | 1–3 |
| Days per package at the label's own serving | 60–180 days |
| Price per serving | $0.1766 · computed from price observed 2026-09-11 |
| Price per day at the label's own serving | $0.1766–0.5298 · computed from price observed 2026-09-11 |
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.
Percent daily value · observed and computed
The label's percent daily value, recomputed
NutriCology Magnesium Citrate files 1 magnesium percent-daily-value entries in NIH DSLD 235550; the check below applies the group-specific references in 21 CFR 101.9 to its 170 mg primary serving, calculated 2026-09-13.
| Group as filed | Declared | Reference | Recomputed | Difference |
|---|---|---|---|---|
| Adults and children 4 or more years of age | 40% | 420 mg | 40% | 0 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
NutriCology Magnesium Citrate lists 4 other ingredients in NIH DSLD 235550, label dated 2020-09-25, examined 2026-09-13.
| Entry | Ingredient |
|---|---|
| 1 | Hydroxypropyl Methylcellulose |
| 2 | Microcrystalline Cellulose |
| 3 | Magnesium Stearate |
| 4 | Silicon Dioxide |
Capsule material: vegetarian. The material classification follows the filed ingredient names; it is not a test of the shell.
This label lists magnesium stearate, whose reference elemental fraction is 4.1% by mass. No stearate quantity is available in this record as of 2026-09-13, so its magnesium contribution cannot be quantified or added to the Supplement Facts magnesium total.
Label declarations · observed
Target groups as filed
NutriCology Magnesium Citrate has 1 target-group entries in NIH DSLD 235550, label dated 2020-09-25, examined 2026-09-13.
| Entry | Filed group |
|---|---|
| 1 | Adult (18 - 50 Years) |
Provenance · observed
Registry record, versions and scanned label
The registry holds 5 versions of this label for NutriCology Magnesium Citrate, according to the retained record examined 2026-09-13; the label date is 2020-09-25.
| NIH DSLD label | NIH DSLD 235550 |
|---|---|
| Registry snapshot | 2026-08-10 |
| Label date | 2020-09-25 |
| Physical state | Capsule |
| Barcode as filed | 7 13947 56660 6 |
| Versions held by the registry | 5; version details are not available in this enrichment record as of 2026-09-13 |
| 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.