Label arithmetic · NIH DSLD 245948
Rainbow Light Magnesium Calcium+: 321 mg of magnesium per tablet, 1 tablet a day – ascorbate + aspartate + oxide
321 mg of magnesium per tablet, 1 a day. From ascorbate + aspartate + oxide; no US price matched (Nov 2). Inside: label lines, ingredients.
Rainbow Light Magnesium Calcium+ declares 321 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 245948, label dated 2021-03-25.
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: 76% vs 76%
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 | 321 mg |
| Units per serving | 1 |
| 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 245948 · label 2021-03-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Rainbow Light Magnesium Calcium+ files 2 magnesium lines in NIH DSLD 245948; the selected primary line declares 321 mg of elemental magnesium per serving, against 1 other row 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 |
|---|---|---|
| 67 mg | ascorbate · Vitamin C (Form: as Magnesium Ascorbate) | Excluded from the primary amount |
| 321 mg | ascorbate, aspartate, oxide · Magnesium (Form: as Magnesium Oxide, Magnesium Chelate, Magnesium Ascorbate, Magnesium Aspartate) | Primary serving |
Source · NIH DSLD 245948 · label 2021-03-25; 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 3 magnesium forms (ascorbate, aspartate, 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 |
|---|---|---|
| ascorbate | No defined fraction | named on label |
| Magnesium aspartate | 7.5–15.6% | named on label |
| Magnesium oxide | 60.3% | named on label |
Source · NIH DSLD 245948 · label 2021-03-25; 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, Rainbow Light Magnesium Calcium+ lasts 180 days: 180 servings against 1 serving a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 180 Tablet(s) |
| Serving size as filed | 1 Tablet(s) |
| Servings per container | 180 |
| Servings per day in the directions | 1 |
| Days per bottle | 180 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 245948 · label 2021-03-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "76% Daily Value" mean here, and does it recompute?
The label declares 76% Daily Value; 321 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 76%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 76% | 420 mg | 76% |
Source · NIH DSLD 245948; 21 CFR 101.9 · label 2021-03-25 · 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?
Rainbow Light Magnesium Calcium+ files 4 other ingredients and a vegetarian shell.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Microcrystalline Cellulose |
| 2 | Stearic Acid |
| 3 | Croscarmellose Sodium |
| 4 | Coating |
| Shell | vegetarian |
| Target group | Vegetarian |
| Target group | Adult (18 - 50 Years) |
| Target group | Gluten Free |
2 additional rows
| Entry | Filed ingredient or declaration |
|---|---|
| Target group | Dairy Free |
| Target group | Sugar Free |
Source · NIH DSLD 245948 · label 2021-03-25; 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?
Rainbow Light has 0 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. Rainbow Light 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 245948 · label 2021-03-25; 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 245948 · label 2021-03-25; 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 245948 (label 2021-03-25, 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 0 21888 10102 3); 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 245948 |
| Label date | 2021-03-25 |
| Date entered into DSLD | 2021-03-25 |
| Barcode (UPC) as filed | 0 21888 10102 3 |
| Label version · Package size difference, same product | NIH DSLD 245930 |
| Formulated and Distributed by | Nutranext Business, LLC, Sunrise, FL, USA |
| Claim category as filed | Nutrient |
| Claim category as filed | All Other |
17 additional rows
| Field | As filed |
|---|---|
| Claim category as filed | Structure/Function |
| Formulation re: Vegetarian/Vegan | Vegetarian |
| Formulation re: Does NOT Contain | Free of gluten Wheat Milk/dairy Nuts Soy Eggs Fish Shellfish Yeast Sugar Artificial additives |
| Formula re: Contains | Bone health plus greater muscle & tension support Magnesium and Calcium plus targeted herbs to promote strong bones and muscles, and help soothe muscle soreness. Added nutrients nourish, help ease tension, enhance absorption and aid digestion. |
| Formula re: Type | Ideal for athletes, those who require extra support for muscle aches and cramps, or have low magnesium intake. |
| Formula re: Contains | Calcium promotes healthy bones and teeth Targeted muscle & tension support Magnesium Soothing herbs Vitamin B6 Protects, and aids absorption & digestion Vitamins C & D Betaine HCI Spirulina Ginger Herbs |
| Suggested/Recommended/Usage/Directions | Suggested Usage: Take 1 tablet per day, with or between meals. |
| Precautions re: Children | Keep out of reach of children. |
| Precautions re: Pregnant or Nursing or Prescription Medications | Consult your health care professional prior to use if you are pregnant, nursing, taking medication or have a medical condition. |
| 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. |
| Formulation re: Other | Helps soothe muscles & tension Added nutrients nourish & aid absorption |
| Formulation re: Does NOT Contain | Gluten-free |
| FDA Statement of Identity | Multi-Mineral Supplement |
| General Statements: All Other Content | 100% recycled, 100% recyclable BPA-free bottle Please remove label to recycle bottle. To open, press along perforation. |
| Brand IP Statement(s) re: (c), (TM), (SM) | 2019 |
| Physical state | Tablet or Pill |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 245948 · label 2021-03-25; 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.