Label arithmetic · NIH DSLD 203385
Doctor's Best CoQ10 L-Carnitine Magnesium: 67 mg of magnesium per capsule, 3 capsules a day, $23.99 a month
67 mg of magnesium per capsule; the label's 3 capsules a day cost $23.99 a month (Amazon, Nov 2). Inside: label lines, ingredients.
Doctor's Best CoQ10 L-Carnitine Magnesium declares 200 mg of elemental magnesium from an amino acid chelate. "Amino acid chelate" names a class of compounds rather than one defined substance, so no elemental fraction exists and the compound mass cannot be computed from the label. Observed at $0.3998 per 100 mg, rank 16 of 17 ranked glycinate offers (1 = lowest price per 100 mg), percentile 94 (lower = lower price). NIH DSLD 203385, label dated 2019-09-24.
as filedData release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-11-02 · chemistry 2026-10-17
Mass: not computable · Price: $0.3998 per 100 mg · % DV: 50% vs 48%
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 200 mg of magnesium actually fit in one capsule, or do I need more than one?
The compound mass behind this label cannot be computed as of 2026-11-02: Single-salt capacity audit excluded as of 2026-10-17: buffered, complex, blend or asporotate wording leaves the composition unresolved.. The filed amounts are listed in the next block. Lower bound, not a measurement: even if all 200 mg of magnesium per serving came from magnesium oxide (60.3% magnesium), the richest magnesium salt used in supplements, because "buffered" on the label does not pin down the form, each of the 3 capsules would need at least 111 mg of compound, so at this bound it needs at least a size 0 capsule (about 545 mg at 0.8 g/mL); the actual mix of forms may need more.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | 200 mg |
| Units per serving | 3 |
| Magnesium salt per serving | Not computable as of 2026-11-02 |
| Magnesium salt per capsule | Not computable as of 2026-11-02 |
| Capsule capacity 0 · 00 · 000 | 545 · 730 · 1,100 mg |
| Verdict | Not computable as of 2026-11-02 |
Source · NIH DSLD 203385 · label 2019-09-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Doctor's Best CoQ10 L-Carnitine Magnesium files 1 magnesium line in NIH DSLD 203385; the selected primary line declares 200 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 |
|---|---|---|
| 200 mg | Magnesium Note: from | Primary serving |
Source · NIH DSLD 203385 · label 2019-09-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Does this label's magnesium claim hold up, or could the magnesium come from another source?
No single magnesium salt is resolved from the filed record as of 2026-11-02, so the source of the declared magnesium cannot be checked against capsule capacity, compared with oxide, the salt richest in magnesium at 60.3%.
computed with assumption| Form named on the label | Elemental fraction | Source |
|---|---|---|
| No form named as of 2026-11-02 | No defined fraction | named on label |
Source · NIH DSLD 203385 · label 2019-09-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Is this a good price for the elemental magnesium I'm actually getting?
Doctor's Best CoQ10 L-Carnitine Magnesium costs $0.3998 per 100 mg of elemental magnesium at the price observed 2026-11-02, rank 16 of 17 ranked glycinate offers (1 = lowest price per 100 mg), percentile 94 (lower = lower price), against a same-salt median of none; prices observed 2026-10-26 to 2026-11-02. First observed 2026-10-26 at $23.99, latest 2026-11-02 at $23.99, 2 observations.
computed| Rank | Label | Per 100 mg | Observed |
|---|---|---|---|
| 0 | Doctor's Best CoQ10 L-Carnitine Magnesium (this label) | $0.3998 | 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, Doctor's Best CoQ10 L-Carnitine Magnesium lasts 30 days: 30 servings against 1 serving a day in the filed directions. $23.99 a month at the label's suggested use (3 capsules a day) and $50.37 at the 420 mg Daily Value reference (21 CFR 101.9); arithmetic on the label, not intake advice.
computed| Measure | Value |
|---|---|
| Net contents as filed | 90 Veggie Cap(s) |
| Serving size as filed | 3 Veggie Capsule(s) |
| Servings per container | 30 |
| Servings per day in the directions | 1 |
| Days per bottle | 30 days |
| Cost a month at the label suggested use | $23.99 a month at the label's suggested use (3 capsules a day) |
| $ per 30 days at 420 mg Daily Value | $50.37 |
Source · NIH DSLD 203385 · label 2019-09-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "50% Daily Value" mean here, and does it recompute?
The label declares 50% Daily Value; 200 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 48%, a difference of 2 points. Labels filed under the earlier 400 mg reference, or with a different filing basis, show gaps of this kind.
computed
Chart data
| Displayed chart text |
|---|
| Declared vs recomputed % |
| DV |
| 48 · 50 |
| Declared vs |
| recomputed % DV |
| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 50% | 420 mg | 48% |
Source · NIH DSLD 203385; 21 CFR 101.9 · label 2019-09-24 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain magnesium stearate, what shell is it, and who is it filed for?
Doctor's Best CoQ10 L-Carnitine Magnesium files 4 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.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Modified Cellulose |
| 2 | Microcrystalline Cellulose |
| 3 | Silicon Dioxide |
| 4 | Magnesium Stearate |
| Shell | vegetarian |
| Target group | Vegan |
| Target group | Vegetarian |
| Target group | Adult (18 - 50 Years) |
1 additional rows
| Entry | Filed ingredient or declaration |
|---|---|
| Target group | Gluten Free |
Source · NIH DSLD 203385 · label 2019-09-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What has research measured about this form, and about side effects?
No study in the registry measured an unresolved salt as of 2026-11-02.
measured| Year | Study | PubMed |
|---|
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?
Doctor's Best has 0 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. Doctor's Best 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 |
|---|---|---|---|
| No recall record as of 2026-10-19 |
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 203385 · label 2019-09-24; 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 203385 · label 2019-09-24; 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 203385 (label 2019-09-24, snapshot 2026-08-10), a price observed 2026-11-02 and the chemistry model of 2026-09-13. 2 gaps remain: Single-salt capacity audit excluded as of 2026-10-17: buffered, complex, blend or asporotate wording leaves the composition unresolved.; A single salt with a defined elemental fraction is unresolved as of 2026-11-02. The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 203385 |
| Label date | 2019-09-24 |
| Date entered into DSLD | 2019-09-24 |
| Barcode (UPC) as filed | 7 53950 00477 1 |
| Manufactured for | Doctor's Best, Inc., California, USA |
| Claim category as filed | Nutrient |
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
17 additional rows
| Field | As filed |
|---|---|
| Formula re: Contains | Doctor's Best combination of CoQ10, L-Carnitine, and buffered chelated Magnesium is a unique blend of nutrients that supports energy, muscle mass and muscle recovery. This convenient combination is designed to help support your high intensity workouts and optimize physical performance. |
| General Statements: All Other Content | Helps support energy Helps support muscle mass Helps support muscle recovery |
| FDA Disclaimer Statement | These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. |
| Brand IP Statement(s) re: (c), (TM), (SM) | The Albion Gold Medallion design is a registered trademark of Albion Laboratories, Inc. |
| General: Product/Version Code | YDRB477 |
| FDA Statement of Identity | Dietary Supplement |
| Brand IP Statement(s) re: (c), (TM), (SM) | Science-Based Nutrition |
| General Statements: All Other Content | Helps support energy, muscle mass and muscle recovery |
| Seals/Symbols | Albion Minerals |
| Seals/Symbols | Vegan |
| Suggested/Recommended/Usage/Directions | Take 3 capsules daily with food, or as recommended by a nutritionally-informed physician. |
| Formula re: Contains | USP Verified, Naturally Fermented CoQ10 |
| Formulation re: Does NOT Contain | Non-GMO Gluten free Soy free |
| Formulation re: Vegetarian/Vegan | Vegan |
| Storage | Store in a cool dry place. |
| Physical state | Capsule |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 203385 · label 2019-09-24; 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.