Label arithmetic · NIH DSLD 75523
Source Naturals Coral Calcium/Magnesium 2:1 Ratio: 200 mg of magnesium per tablet, 3 tablets a day – citrate + oxide
200 mg of magnesium per tablet; the label's 3 tablets a day give 600 mg. From citrate + oxide. Inside: label lines, ingredients.
Source Naturals Coral Calcium/Magnesium 2:1 Ratio declares 600 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. No US retail price matched as of 2026-11-02. NIH DSLD 75523, label dated 2017-06-23.
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: 150% vs 143%
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: one salt with a defined elemental fraction is not resolved.. The filed amounts are listed in the next block.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | 600 mg |
| Units per serving | 3 |
| 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 75523 · label 2017-06-23; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Source Naturals Coral Calcium/Magnesium 2:1 Ratio files 1 magnesium line in NIH DSLD 75523; the selected primary line declares 600 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 |
|---|---|---|
| 600 mg | citrate, oxide · Magnesium (Form: as Magnesium Chelate, Magnesium Oxide, Magnesium Citrate, & naturally occurring from Coral) | Primary serving |
Source · NIH DSLD 75523 · label 2017-06-23; 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 75523 · label 2017-06-23; 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, Source Naturals Coral Calcium/Magnesium 2:1 Ratio lasts 15 days: 15 servings against 1 serving a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 45 Tablet(s) |
| Serving size as filed | 3 Tablet(s) |
| Servings per container | 15 |
| Servings per day in the directions | 1 |
| Days per bottle | 15 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 75523 · label 2017-06-23; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "150% Daily Value" mean here, and does it recompute?
The label declares 150% Daily Value; 600 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 143%, a difference of 7 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 |
| 143 · 150 |
| Declared vs |
| recomputed % DV |
| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 150% | 420 mg | 143% |
Source · NIH DSLD 75523; 21 CFR 101.9 · label 2017-06-23 · 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?
Source Naturals Coral Calcium/Magnesium 2:1 Ratio files 4 other ingredients and a vegetarian shell.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Acacia Gum |
| 2 | Stearic Acid |
| 3 | silicified Microcrystalline Cellulose |
| 4 | modified Cellulose Gum |
| Shell | vegetarian |
| Target group | Adult (18 - 50 Years) |
Source · NIH DSLD 75523 · label 2017-06-23; 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?
Source Naturals has 6 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. Source Naturals 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-0100-2014 | 2013-11-13 | The firm found small piece of metal fragment in one tablet during its inspection process. | Terminated |
| F-1100-2014 | 2013-12-25 | Dietary Supplements were made with bulk products provided by National Enzyme Company which are currently under recall for chloramphenicol | Terminated |
| F-2178-2017 | 2017-05-10 | Testing of Vitamin D-3 as a result of a consumer complaint found specific lots to have lower concentrations than product specifications of ingredient labeling. | Terminated |
| F-2380-2017 | 2017-07-19 | Dietary supplements contain low levels of undeclared boron | Terminated |
| F-2383-2017 | 2017-07-19 | Dietary supplements contain low levels of undeclared boron | 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?
Same filed formulation as 1 other labels of this brand; no other brand files it as of 2026-11-02.
computed| Label | Brand | Price per 100 mg |
|---|---|---|
| No cross-brand match as of 2026-11-02 |
Source · NIH DSLD 75523 · label 2017-06-23; 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 75523 · label 2017-06-23; 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 75523 (label 2017-06-23, 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: one salt with a defined elemental fraction is not resolved.; No US retail price matched as of 2026-11-02 (barcode 0 21078 01601 4); 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 75523 |
| Label date | 2017-06-23 |
| Date entered into DSLD | 2017-06-23 |
| Barcode (UPC) as filed | 0 21078 01601 4 |
| Label version · Package size difference, same product | NIH DSLD 214293 |
| Label version · Package size difference, same product | NIH DSLD 75524 |
| Manufactured for: | Source Naturals, Inc., Santa Cruz, CA |
| Claim category as filed | Nutrient |
16 additional rows
| Field | As filed |
|---|---|
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
| Brand IP Statement(s) re: (c), (TM), (SM) | Eco-friendly |
| FDA Statement of Identity | Dietary Supplement |
| Suggested/Recommended/Usage/Directions | Suggested Use: 3 tablets daily. |
| Precautions re: Pregnant or Nursing or Prescription Medications | Note: If you are pregnant, may become pregnant, or breastfeeding, consult your health care professional before using this product. |
| Formula re: Contains | Source Naturals Coral Calcium/Magnesium is an excellent source of these two alkaline minerals in an optimal 2:1 ratio. |
| General Statements: All Other Content | In addition to building healthy bones, calcium plays essential roles in muscle contractions, heartbeat, blood clotting, nerve transmission, and in converting signals from hormones in the blood into actions within cells. Magnesium is involved in over 300 vital cellular processes, and helps to regulate the action of calcium in muscle function and heart health. |
| Formula re: Contains | The vitamin D in this formula supports intestinal absorption of calcium and its optimal use in the body. |
| General Statements: All Other Content | Source Naturals Coral Calcium/Magnesium is eco-friendly: It is harvested from fossilized (dead) coral and is not harmful to living coral. |
| Precautions re: All Other | Do not use if either tamper-evident seal is broken or missing. |
| Precautions re: Children | Keep out of the reach of children. |
| 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. |
| General: Product/Version Code | SN1601 REV E161 (49) |
| Physical state | Tablet or Pill |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 75523 · label 2017-06-23; 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.