Label arithmetic · NIH DSLD 326663
OL Olympian Labs Magnesium Citrate 400 mg: 133 mg of magnesium per capsule, 3 capsules a day
133 mg of magnesium per capsule; the label's 3 capsules a day give 400 mg. No US price matched (Nov 2). Inside: salt weight, capsule size.
OL Olympian Labs Magnesium Citrate 400 mg declares 400 mg of elemental magnesium per serving as citrate, which needs 825–1,180 mg of magnesium citrate in each capsule, against 1,100 mg in the largest standard capsule (size 000) at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range: it fits only that size. No US retail price matched as of 2026-11-02; 17 of the 135 citrate labels in this registry have a matched price. NIH DSLD 326663, label dated 2025-04-24.
computed from the filed label
Chart data
| Displayed chart text |
|---|
| 545 mg |
| 730 mg |
| 1,100 mg |
| 825–1,180 mg of citrate per capsule |
Data release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-10-19 · chemistry 2026-10-17
Mass: 825–1,180 mg per capsule · Price: none matched · % DV: 95% vs 95%
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 400 mg of citrate actually fit in one capsule, or do I need more than one?
Estimated salt mass versus assumed capsule capacity: OL Olympian Labs Magnesium Citrate 400 mg implies 825–1,180 mg of magnesium citrate in each capsule to deliver 400 mg of elemental magnesium, against 1,100 mg in the largest standard capsule (size 000) at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range. Verdict: needs size 000, read at the most favourable hydration and the most units per serving.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | 400 mg |
| Units per serving | 3 |
| Magnesium citrate per serving | 2,475–3,540 mg |
| Magnesium citrate per capsule | 825–1,180 mg |
| Capsule capacity 0 · 00 · 000 | 545 · 730 · 1,100 mg |
| Verdict | Needs size 000 |
The filed salt can have more than one hydration state (trimagnesium dicitrate 16.2%; dibasic and hydrated forms as low as 11.3%), so the compound mass is a range.
Source · NIH DSLD 326663 · label 2025-04-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
OL Olympian Labs Magnesium Citrate 400 mg files 1 magnesium line in NIH DSLD 326663; the selected primary line declares 400 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 |
|---|---|---|
| 400 mg | Salt not named in this row; magnesium citrate is taken from the label text | Primary serving |
Source · NIH DSLD 326663 · label 2025-04-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Does this label's citrate claim hold up, or could the magnesium come from another source?
The label names one magnesium form, citrate, resolved from the full NIH DSLD record text; at that salt the declaration is within the assumed size 000 capacity at powder density 0.8 g/mL, 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% | full NIH DSLD record text |
Source · NIH DSLD 326663 · label 2025-04-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Is this a good price for the elemental magnesium I'm actually getting?
No US retail price is matched to this label as of 2026-11-02; 17 of 135 citrate labels have one, against a median of $0.1159 per 100 mg among 12 ranked citrate offers.
computed
Chart data
| Displayed chart text |
|---|
| n=12 |
| P25 $0.0843 |
| P75 $0.1469 |
| median $0.1159 |
| Rank | Label | Per 100 mg | Observed |
|---|---|---|---|
| 1 | Best Naturals Magnesium Citrate 200 mg | $0.0344 | 2026-11-02 |
| 2 | Solgar Magnesium Citrate | $0.0607 | 2026-11-02 |
| 3 | LES Labs Magnesium Citrate | $0.0777 | 2026-11-02 |
| 4 | Bluebonnet Magnesium Citrate | $0.0865 | 2026-11-02 |
| 5 | Solaray Magnesium Citrate 400 mg | $0.0868 | 2026-11-02 |
| Median | 12 ranked citrate offers | $0.1159 | 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, OL Olympian Labs Magnesium Citrate 400 mg lasts 100 days: 100 servings against 1 serving a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 300 Vegetarian Capsule(s) |
| Serving size as filed | 3 Capsule(s) |
| Servings per container | 100 |
| Servings per day in the directions | 1 |
| Days per bottle | 100 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 326663 · label 2025-04-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "95% Daily Value" mean here, and does it recompute?
The label declares 95% Daily Value; 400 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 95%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 95% | 420 mg | 95% |
Source · NIH DSLD 326663; 21 CFR 101.9 · label 2025-04-24 · 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?
OL Olympian Labs Magnesium Citrate 400 mg files 5 other ingredients and a vegetarian shell, and no magnesium stearate, against 43 of 135 citrate labels that list magnesium stearate.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Hydroxypropyl Methylcellulose |
| 2 | Microcrystalline Cellulose |
| 3 | Ascorbyl Palmitate |
| 4 | Silicon Dioxide |
| 5 | Rice Flour |
| Shell | vegetarian |
| Target group | Vegan |
| Target group | Vegetarian |
4 additional rows
| Entry | Filed ingredient or declaration |
|---|---|
| Target group | Adult (18 - 50 Years) |
| Target group | No Allergies |
| Target group | Gluten Free |
| Target group | Dairy Free |
Source · NIH DSLD 326663 · label 2025-04-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What has research measured about citrate, and about side effects?
10 studies in the PubMed-checked registry measured outcomes involving citrate; 1 mention gastrointestinal or adverse outcomes. They measured the salt, not this label.
measured| Year | Study | PubMed |
|---|---|---|
| 2025 | Comparing the Bioavailability of Two Seawater-Derived Magnesium Preparations. | 40955524 |
| 2024 | Comparative Clinical Study on Magnesium Absorption and Side Effects After Oral Intake of Microencapsulated Magnesium (MAGSHAPE™ Microcapsules) Versus Other Magnesium Sources. | 39770988 |
| 2022 | Effects of short-term magnesium supplementation on ionized, total magnesium and other relevant electrolytes levels. | 35041150 |
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?
OL Olympian Labs has 0 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. OL Olympian Labs has no FDA CAERS adverse event report on record at brand level as of 2026-10-19 (143 of 273 brands in this registry have at least one CAERS report).
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?
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 326663 · label 2025-04-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which labels are closest to this one, with the same salt and dose?
6 labels use the same resolved citrate within ±10% of this label's 133 mg per unit, compared side by side on price and capsule verdict.
computed| Label | Elemental per unit | Price | Verdict |
|---|---|---|---|
| AN Amazing Nutrition Amazing Formulas Magnesium Citrate 400 mg | 133 mg | No price | Capsule sizes do not apply |
| Protocol For Life Balance Magnesium Citrate | 133 mg | No price | Capsule sizes do not apply |
| OL Olympian Labs Magnesium Citrate 400 mg | 133 mg | No price | Needs size 000 |
| NOW Magnesium Citrate 400 mg | 133 mg | No price | Needs size 000 |
| Solaray Magnesium Citrate 400 mg | 133 mg | $20.84 · 2026-11-02 | Needs size 000 |
| Source Naturals Magnesium Citrate 133 mg | 133 mg | No price | Needs size 000 |
Source · NIH DSLD 326663 · label 2025-04-24; 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 326663 (label 2025-04-24, snapshot 2026-08-10) and the chemistry model of 2026-09-13. 1 gap remain: No US retail price matched as of 2026-11-02 (barcode 7 10013 03118 1). The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 326663 |
| Scanned label (PDF) | Label 326663 scan |
| Label date | 2025-04-24 |
| Date entered into DSLD | 2025-04-24 |
| Barcode (UPC) as filed | 7 10013 03118 1 |
| Label version · Image difference, same product | NIH DSLD 38942 |
| Label version · Image difference, same product | NIH DSLD 9702 |
| Label version · Image difference, same product | NIH DSLD 67131 |
21 additional rows
| Field | As filed |
|---|---|
| Manufactured for | Olympian Labs, Inc., Phoenix, AZ |
| Claim category as filed | Nutrient |
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
| Formulation re: Other | Olympian Labs, Inc. products are made with the highest quality ingredients and manufactured according to current Good Manufacturing Practice (cGMP). |
| Precautions re: Pregnant or Nursing or Prescription Medications | Caution: If you are pregnant or nursing, have a medical condition, or are taking medication, consult your healthcare professional before using this or any other nutritional supplement. |
| Precautions re: Allergies | Discontinue use if allergic reaction occurs. We do not use ingredients that were produced using modern biotechnology |
| Precautions re: Children | Keep out of reach of children. |
| Storage | Store in a cool, dry place. |
| 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: Does NOT Contain | Non GMO Gluten free |
| Formulation re: Vegetarian/Vegan | Vegan |
| Formulation re: Other | Supports muscle & nerve function Highly absorbable |
| FDA Statement of Identity | Dietary Supplement |
| Suggested/Recommended/Usage/Directions | Suggested use: As a dietary supplement, take three (3) capsules daily with food, or as directed by a healthcare professional. |
| Formulation re: Does NOT Contain | No milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, or soybeans. |
| Formulation re: Does NOT Contain | Allergen free |
| Formulation re: Other | Made in USA |
| Formula re: Contains | Magnesium Citrate 400 mg per serving Essential mineral for heart & bone health |
| Physical state | Capsule |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 326663 · label 2025-04-24; 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.