Label arithmetic · NIH DSLD 327131
Dr. Mercola Magnesium Advanced
Dr. Mercola Magnesium Advanced declares 145 mg of elemental magnesium as l-threonate, which needs 586 mg of salt per unit — a size 00 capsule or larger; NIH DSLD 327131, label dated 2025-03-25, calculation 2026-09-13.
FDA recall records for Dr. Mercola: 2 · queried 2026-09-13; brand-string matches across products.
Mass budget · computed; capsule comparison · modelled
What the declared salt would weigh
Dr. Mercola Magnesium Advanced declares 145 mg of elemental magnesium per serving in NIH DSLD 327131, requiring 1,757.58 mg of magnesium l-threonate under the salt model calculated 2026-09-13.
| Step | Value | Evidence |
|---|---|---|
| Declared elemental magnesium | 145 mg per serving | observed · label 2025-03-25 |
| Resolved salt | Magnesium L-threonate · label-row | computed · name resolved from filed text |
| Reference formula | Mg(C₄H₇O₅)₂; 294.5 g/mol | computed · chemical reference |
| Elemental fraction | 8.25% by mass | computed |
| Compound mass per serving | 1,757.58 mg = 145 mg ÷ elemental fraction | computed |
| Compound mass per discrete unit | 585.86 mg | computed |
At powder density 0.6–0.8 g/mL, 586 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. Mercola Magnesium Advanced has 14 published fields below, traced to NIH DSLD 327131 and the 2026-08-10 registry snapshot, with calculations dated 2026-09-13.
| Field | Value | Evidence tier |
|---|---|---|
| NIH DSLD identifier | 327131 | observed |
| Resolved salt | Magnesium L-threonate | computed |
| Source of the resolved salt | label-row | observed |
| Elemental magnesium per serving (mg) | 145 | observed |
| Servings per container | 30 | observed |
| Elemental magnesium per container (mg) | 4350 | computed |
| Compound mass per discrete unit | 585.86 mg | computed |
| Capsule fill verdict | needs-00 | modelled |
| Required standard capsule size | 00 | modelled |
| Label date | 2025-03-25 | observed |
| Retail match confidence | legacy-provisional | computed |
| Observed container price (USD) | 34.97 | observed |
| Price observation date | 2026-09-07 | observed |
| Cost per 100 mg elemental (USD) | 0.0583 | 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. Mercola Magnesium Advanced retains 2 magnesium-related rows in NIH DSLD 327131, including 1 rows selected for the primary serving, from label 2025-03-25, examined 2026-09-13.
| Filed amount | Serving order | Filed salt / notes | Calculation role |
|---|---|---|---|
| 145 mg | 1 | threonate Magnesium (Form: from Magnesium L-Threonate) | Selected primary serving |
| 2000 mg | 1 | Salt not identified in this row as of 2026-09-13 | Other nutrient or serving row; excluded from primary amount |
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 threonate
Dr. Mercola Magnesium Advanced's $0.0583 per 100 mg of elemental magnesium is at percentile 33 among 3 threonate labels with observed prices, using confirmed gold-set matches observed 2026-08-10 to 2026-09-07, calculated 2026-09-13.
| Observed item price · Amazon | $34.97 on 2026-09-07 |
|---|---|
| Cost per 100 mg elemental | $0.0583 |
| Observed prices in threonate | 3 confirmed matches |
| Percentile | 33 |
| Match confidence | legacy-provisional |
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
Dr. Mercola Magnesium Advanced works out to 30 days per package at the label's own serving and filed frequency of 1 servings per day, according to label 2025-03-25, calculated 2026-09-13.
| Net contents as filed | 90 Capsule(s) |
|---|---|
| Discrete units in the package | 90 |
| Serving size as filed | 3 Capsule(s) |
| Units per serving | 3 |
| Servings per package | 30 |
| Daily servings in the label instructions | 1 |
| Days per package at the label's own serving | 30 days |
| Price per serving | $1.1657 · computed from price observed 2026-09-07 |
| Price per day at the label's own serving | $1.1657 · computed from price observed 2026-09-07 |
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
Dr. Mercola Magnesium Advanced files 1 magnesium percent-daily-value entries in NIH DSLD 327131; the check below applies the group-specific references in 21 CFR 101.9 to its 145 mg primary serving, calculated 2026-09-13.
| Group as filed | Declared | Reference | Recomputed | Difference |
|---|---|---|---|---|
| Adults and children 4 or more years of age | 35% | 420 mg | 35% | 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
Dr. Mercola Magnesium Advanced lists 4 other ingredients in NIH DSLD 327131, label dated 2025-03-25, examined 2026-09-13.
| Entry | Ingredient |
|---|---|
| 1 | Hydroxypropyl Methylcellulose |
| 2 | Microcrystalline Cellulose |
| 3 | Ascorbyl Palmitate |
| 4 | Hydroxypropyl Cellulose |
Capsule material: vegetarian. The material classification follows the filed ingredient names; it is not a test of the shell.
Label declarations · observed
Target groups as filed
Dr. Mercola Magnesium Advanced has 1 target-group entries in NIH DSLD 327131, label dated 2025-03-25, examined 2026-09-13.
| Entry | Filed group |
|---|---|
| 1 | Adult (18 - 50 Years) |
Provenance · observed
Registry record, versions and scanned label
The registry holds 8 versions of this label for Dr. Mercola Magnesium Advanced, according to the retained record examined 2026-09-13; the label date is 2025-03-25.
| NIH DSLD label | NIH DSLD 327131 |
|---|---|
| Registry snapshot | 2026-08-10 |
| Label date | 2025-03-25 |
| Physical state | Capsule |
| Barcode as filed | 8 13006 01778 7 |
| Versions held by the registry | 8; version details are not available in this enrichment record as of 2026-09-13 |
| Source scan | Scanned label (NIH DSLD) |
| 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.