Label arithmetic · NIH DSLD 9831
Douglas Laboratories Dyna-Cal Extra-Strength Natural Calcium/Magnesium Complex: 105 mg of magnesium per tablet, 4 tablets a day – citrate + oxide
105 mg of magnesium per tablet; the label's 4 tablets a day give 420 mg. From citrate + oxide. Inside: label lines, ingredients.
Douglas Laboratories Dyna-Cal Extra-Strength Natural Calcium/Magnesium Complex declares 420 mg of elemental magnesium per 4 tablet(s); the magnesium salt is not resolved from the filed record, Single-salt capacity audit excluded as of 2026-10-17: buffered, complex, blend or asporotate wording leaves the composition unresolved., as of 2026-11-02. No US retail price matched as of 2026-11-02. NIH DSLD 9831, label dated 2012-06-01.
as filedData release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-10-19 · chemistry 2026-10-17
Mass: not computable · Price: none matched · % DV: 105% vs 100%
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.
How much magnesium compound is pressed into one tablet?
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.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | 420 mg |
| Units per serving | 4 |
| Magnesium salt per serving | Not computable as of 2026-11-02 |
| Magnesium salt per tablet | 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 9831 · label 2012-06-01; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Douglas Laboratories Dyna-Cal Extra-Strength Natural Calcium/Magnesium Complex files 1 magnesium line in NIH DSLD 9831; the selected primary line declares 420 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 |
|---|---|---|
| 420 mg | citrate, oxide · Magnesium (Form: from Magnesium Oxide, Magnesium Citrate) | Primary serving |
Source · NIH DSLD 9831 · label 2012-06-01; 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?
The label names 2 magnesium forms (citrate, oxide); a named blend does not establish how much magnesium each form contributes, so the resolved reading is the most favourable one, compared with oxide, the salt richest in magnesium at 60.3%.
computed with assumption| Form named on the label | Elemental fraction | Source |
|---|---|---|
| Magnesium citrate | 11.3–16.2% | named on label |
| Magnesium oxide | 60.3% | named on label |
Source · NIH DSLD 9831 · label 2012-06-01; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Is this a good price for the elemental magnesium I'm actually getting?
No US retail price is matched to this label as of 2026-11-02, and without a resolved salt there is no same-salt comparison.
computed| Rank | Label | Per 100 mg | Observed |
|---|
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, Douglas Laboratories Dyna-Cal Extra-Strength Natural Calcium/Magnesium Complex lasts 25 days: 25 servings against 1 serving a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 100 Tablet(s) |
| Serving size as filed | 4 Tablet(s) |
| Servings per container | 25 |
| Servings per day in the directions | 1 |
| Days per bottle | 25 days |
| $ per 30 days at one label serving a day | No ranked price as of 2026-11-02 |
| $ per 30 days at 420 mg Daily Value | No ranked price as of 2026-11-02 |
Source · NIH DSLD 9831 · label 2012-06-01; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "105% Daily Value" mean here, and does it recompute?
The label declares 105% Daily Value; 420 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 100%, a difference of 5 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 |
| 100 · 105 |
| Declared vs |
| recomputed % DV |
| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 105% | 420 mg | 100% |
Source · NIH DSLD 9831; 21 CFR 101.9 · label 2012-06-01 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain these other ingredients, what shell is it, and who is it filed for?
Douglas Laboratories Dyna-Cal Extra-Strength Natural Calcium/Magnesium Complex files 3 other ingredients and a vegetarian shell.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Cellulose |
| 2 | Vegetable Stearate |
| 3 | Silica |
| Shell | vegetarian |
| Target group | Adult (18 - 50 Years) |
| Target group | Gluten Free |
| Target group | Dairy Free |
| Target group | Sugar Free |
Source · NIH DSLD 9831 · label 2012-06-01; 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?
Douglas Laboratories has 1 FDA recall record matched by brand name in the enforcement data queried 2026-10-19. Douglas Laboratories 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 |
|---|---|---|---|
| F-1202-2015 | 2015-02-18 | Bottles contained a vegetarian digestive enzyme dietary supplement instead of melatonin. | Terminated |
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 9831 · label 2012-06-01; 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 9831 · label 2012-06-01; 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 9831 (label 2012-06-01, snapshot 2026-08-10) and the chemistry model of 2026-09-13. 3 gaps remain: Single-salt capacity audit excluded as of 2026-10-17: buffered, complex, blend or asporotate wording leaves the composition unresolved.; No US retail price matched as of 2026-11-02 (barcode 3 10539 01579 7); 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 9831 |
| Label date | 2012-06-01 |
| Date entered into DSLD | 2012-06-01 |
| Barcode (UPC) as filed | 3 10539 01579 7 |
| Label version · Image difference, same product | NIH DSLD 106607 |
| Label version · Image difference, same product | NIH DSLD 5461 |
| Label version · Package size difference, same product | NIH DSLD 106607 |
| Label version · Package size difference, same product | NIH DSLD 5461 |
12 additional rows
| Field | As filed |
|---|---|
| Label version · Package size difference, same product | NIH DSLD 9832 |
| Manufactured in the USA for | Douglas Laboratories, Pittsburgh, PA, USA |
| Claim category as filed | All Other |
| Suggested/Recommended/Usage/Directions | Suggested Usage: As a dietary supplement, adults take 4 tablets daily with meals or as directed by your healthcare professional. |
| Precautions re: Children | KEEP OUT OF REACH OF CHILDREN. |
| Storage | For optimal storage conditions, store in a cool, dry place. (59(0)-77(0)F/15(0)-25(0)C) (35-65% relative humidity) |
| Precautions re: All Other | Tamper resistant package, do not use if outer seal is missing. |
| General: Product/Version Code | Formula #80261 |
| Formulation re: Does NOT Contain | This product contains NO yeast, wheat, gluten, milk/dairy, corn, sodium, sugar, starch, artificial coloring, preservatives or flavoring. |
| FDA Statement of Identity | A Dietary Supplement |
| Physical state | Tablet or Pill |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 9831 · label 2012-06-01; 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.