Label arithmetic · NIH DSLD 203385
Doctor's Best CoQ10 L-Carnitine Magnesium
Doctor's Best CoQ10 L-Carnitine Magnesium declares 200 mg of elemental magnesium as glycinate, which needs 473–564 mg of salt per unit and fits a standard size 0 capsule; NIH DSLD 203385, label dated 2019-09-24, calculation 2026-09-13.
Mass budget · computed; capsule comparison · modelled
What the declared salt would weigh
Doctor's Best CoQ10 L-Carnitine Magnesium declares 200 mg of elemental magnesium per serving in NIH DSLD 203385, requiring 1,418.44–1,690.62 mg of magnesium glycinate under the salt model calculated 2026-09-13.
| Step | Value | Evidence |
|---|---|---|
| Declared elemental magnesium | 200 mg per serving | observed · label 2019-09-24 |
| Resolved salt | Magnesium glycinate · full-record | computed · name resolved from filed text |
| Reference formula | Mg(C₂H₄NO₂)₂; 172.42 g/mol | computed · chemical reference |
| Elemental fraction | 11.83–14.1% by mass | computed |
| Why the fraction is a range | bisglycinate; chelate hydration varies by supplier | modelled · hydrate not specified |
| Compound mass per serving | 1,418.44–1,690.62 mg = 200 mg ÷ elemental fraction | computed |
| Compound mass per discrete unit | 472.81–563.54 mg | computed |
At powder density 0.6–0.8 g/mL, 473 mg of powder fits a size 0 capsule (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
Doctor's Best CoQ10 L-Carnitine Magnesium has 11 published fields below, traced to NIH DSLD 203385 and the 2026-08-10 registry snapshot, with calculations dated 2026-09-13.
| Field | Value | Evidence tier |
|---|---|---|
| NIH DSLD identifier | 203385 | observed |
| Resolved salt | Magnesium glycinate | computed |
| Source of the resolved salt | full-record | observed |
| Elemental magnesium per serving (mg) | 200 | observed |
| Servings per container | 30 | observed |
| Elemental magnesium per container (mg) | 6000 | computed |
| Compound mass per discrete unit | 472.81–563.54 mg | computed |
| Capsule fill verdict | fits-0 | modelled |
| Required standard capsule size | 0 | modelled |
| Label date | 2019-09-24 | 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
Doctor's Best CoQ10 L-Carnitine Magnesium retains 1 magnesium-related rows in NIH DSLD 203385, including 1 rows selected for the primary serving, from label 2019-09-24, examined 2026-09-13.
| Filed amount | Serving order | Filed salt / notes | Calculation role |
|---|---|---|---|
| 200 mg | 1 | Salt not identified in this row as of 2026-09-13 Magnesium Note: from | 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
Doctor's Best CoQ10 L-Carnitine Magnesium works out to 30 days per package at the label's own serving and filed frequency of 1 servings per day, according to label 2019-09-24, calculated 2026-09-13.
| Net contents as filed | 90 Veggie Cap(s) |
|---|---|
| Discrete units in the package | Unit count not filed as of 2026-09-13 |
| Serving size as filed | 3 Veggie 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 |
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 · 20 observed prices in glycinate
A same-salt reference for this package
At the median cost per 100 mg observed across 20 glycinate labels ($0.1264), a package of this size (6,000 mg elemental in Doctor's Best CoQ10 L-Carnitine Magnesium) would correspond to $7.58, 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 glycinate · n = 20 |
|---|---|
| Median observed cost per 100 mg | $0.1264 |
| Filed elemental magnesium per package | 6,000 mg |
| Benchmark package equivalent | $7.58 = 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
Doctor's Best CoQ10 L-Carnitine Magnesium files 1 magnesium percent-daily-value entries in NIH DSLD 203385; the check below applies the group-specific references in 21 CFR 101.9 to its 200 mg primary serving, calculated 2026-09-13.
| Group as filed | Declared | Reference | Recomputed | Difference |
|---|---|---|---|---|
| Adults and children 4 or more years of age | 50% | 420 mg | 48% | 2 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
Doctor's Best CoQ10 L-Carnitine Magnesium lists 4 other ingredients in NIH DSLD 203385, label dated 2019-09-24, examined 2026-09-13.
| Entry | Ingredient |
|---|---|
| 1 | Modified Cellulose |
| 2 | Microcrystalline Cellulose |
| 3 | Silicon Dioxide |
| 4 | Magnesium Stearate |
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
Doctor's Best CoQ10 L-Carnitine Magnesium has 4 target-group entries in NIH DSLD 203385, label dated 2019-09-24, examined 2026-09-13.
| Entry | Filed group |
|---|---|
| 1 | Vegan |
| 2 | Vegetarian |
| 3 | Adult (18 - 50 Years) |
| 4 | Gluten Free |
Provenance · observed
Registry record, versions and scanned label
Doctor's Best CoQ10 L-Carnitine Magnesium is identified by 1 NIH DSLD record, 203385, according to the retained record examined 2026-09-13; the label date is 2019-09-24.
| NIH DSLD label | NIH DSLD 203385 |
|---|---|
| Registry snapshot | 2026-08-10 |
| Label date | 2019-09-24 |
| Physical state | Capsule |
| Barcode as filed | 7 53950 00477 1 |
| 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
Doctor's Best CoQ10 L-Carnitine Magnesium 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 203385 (barcode 7 53950 00477 1) 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.