Label arithmetic · NIH DSLD 263073
Woodstock Vitamins Magnesium Glycinate 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.
Woodstock Vitamins Magnesium Glycinate 400 mg declares 400 mg of elemental magnesium per serving as glycinate, which needs 946–1,127 mg of magnesium glycinate 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 73 glycinate labels in this registry have a matched price. NIH DSLD 263073, label dated 2022-04-11.
computed from the filed label
Chart data
| Displayed chart text |
|---|
| 545 mg |
| 730 mg |
| 1,100 mg |
| 946–1,127 mg of glycinate per capsule |
Data release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-10-19 · chemistry 2026-10-17
Mass: 946–1,127 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 glycinate actually fit in one capsule, or do I need more than one?
Estimated salt mass versus assumed capsule capacity: Woodstock Vitamins Magnesium Glycinate 400 mg implies 946–1,127 mg of magnesium glycinate 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 glycinate per serving | 2,837–3,381 mg |
| Magnesium glycinate per capsule | 946–1,127 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 (bisglycinate; chelate hydration varies by supplier), so the compound mass is a range.
Source · NIH DSLD 263073 · label 2022-04-11; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Woodstock Vitamins Magnesium Glycinate 400 mg files 1 magnesium line in NIH DSLD 263073; 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 glycinate is taken from the label text | Primary serving |
Source · NIH DSLD 263073 · label 2022-04-11; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Does this label's glycinate claim hold up, or could the magnesium come from another source?
The label names one magnesium form, glycinate, 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 glycinate | 11.8–14.1% | full NIH DSLD record text |
Source · NIH DSLD 263073 · label 2022-04-11; 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 73 glycinate labels have one, against a median of $0.1889 per 100 mg among 17 ranked glycinate offers.
computed
Chart data
| Displayed chart text |
|---|
| n=17 |
| P25 $0.1338 |
| P75 $0.2216 |
| median $0.1889 |
| Rank | Label | Per 100 mg | Observed |
|---|---|---|---|
| 1 | Amazon Elements Chelated Magnesium 270 mg | $0.0666 | 2026-11-02 |
| 2 | Solgar Chelated Magnesium | $0.0930 | 2026-11-02 |
| 3 | tnvitamins Magnesium Glycinate 300 mg | $0.0962 | 2026-11-02 |
| 4 | New Chapter Magnesium + Ashwagandha | $0.1229 | 2026-11-02 |
| 5 | Windmill Magnesium Glycinate 200 mg | $0.1338 | 2026-11-02 |
| Median | 17 ranked glycinate offers | $0.1889 | 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, Woodstock Vitamins Magnesium Glycinate 400 mg lasts 30 days: 30 servings against 1 serving a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 90 Vegan Capsule(s) |
| Serving size as filed | 3 Capsule(s) |
| Servings per container | 30 |
| Servings per day in the directions | 1 |
| Days per bottle | 30 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 263073 · label 2022-04-11; 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 263073; 21 CFR 101.9 · label 2022-04-11 · 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?
Woodstock Vitamins Magnesium Glycinate 400 mg files 4 other ingredients and a vegetarian shell, and no magnesium stearate, against 28 of 73 glycinate labels that list magnesium stearate.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Vegetable Capsule |
| 2 | Cellulose |
| 3 | Calcium Stearate |
| 4 | Silica |
| Shell | vegetarian |
| Target group | Adult (18 - 50 Years) |
| Target group | Gluten Free |
| Target group | Dairy Free |
Source · NIH DSLD 263073 · label 2022-04-11; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What has research measured about glycinate, and about side effects?
6 studies in the PubMed-checked registry measured outcomes involving glycinate; 2 mention gastrointestinal or adverse outcomes. They measured the salt, not this label.
measured| Year | Study | PubMed |
|---|---|---|
| 2024 | Comparative Clinical Study on Magnesium Absorption and Side Effects After Oral Intake of Microencapsulated Magnesium (MAGSHAPE™ Microcapsules) Versus Other Magnesium Sources. | 39770988 |
| 2024 | The bioaccessibility and tolerability of marine-derived sources of magnesium and calcium. | 38608850 |
| 2020 | Dose-Dependent Absorption Profile of Different Magnesium Compounds | 30761462 |
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?
Woodstock Vitamins has 0 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. Woodstock Vitamins 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?
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 263073 · label 2022-04-11; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which labels are closest to this one, with the same salt and dose?
5 labels use the same resolved glycinate 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 |
|---|---|---|---|
| The Vitamin Shoppe Magnesium Glycinate 400 mg (DSLD 201832) | 133 mg | $34.99 · 2026-11-02 | Capsule sizes do not apply |
| The Vitamin Shoppe Magnesium Glycinate 400 mg (DSLD 201834) | 133 mg | $19.99 · 2026-11-02 | Capsule sizes do not apply |
| Amazon Elements Chelated Magnesium 270 mg | 135 mg | $21.59 · 2026-11-02 | Capsule sizes do not apply |
| Metabolic Maintenance Magnesium Glycinate (DSLD 25018) | 125 mg | No price | Needs size 000 |
| Metabolic Maintenance Magnesium Glycinate (DSLD 274078) | 125 mg | $42.50 · 2026-11-02 | Needs size 000 |
Source · NIH DSLD 263073 · label 2022-04-11; 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 263073 (label 2022-04-11, 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 19985 69334 2). The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 263073 |
| Scanned label (PDF) | Label 263073 scan |
| Label date | 2022-04-11 |
| Date entered into DSLD | 2022-04-11 |
| Barcode (UPC) as filed | 7 19985 69334 2 |
| Label version · Image difference, same product | NIH DSLD 217520 |
| Distributed by | Village Vitality LLC, Woodstock, NY |
| Claim category as filed | Nutrient |
16 additional rows
| Field | As filed |
|---|---|
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
| Formula re: Contains | Gentle on the stomach magnesium glycinate |
| Formulation re: Other | Magnesium is an essential nutrient required for muscle and brain activities, nerve function, and bone health. It is also critical for energy production in the body. Sixty percent of the body's magnesium is stored in the bones, and over 25% is stored in muscle. |
| Formula re: Contains | Dietary surveys show that many people are susceptible to magnesium deficiency. Our magnesium glycinate 400 mg is a superior form of this essential nutrient. |
| Storage | Store in a cool, dry place. |
| Formulation re: Other | We guarantee our supplements for potency and purity |
| Precautions re: All Other | To report a serious adverse event, call 1-888-710-0006 |
| 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. |
| Formula re: Contains | Magnesium glycinate 400 mg per 3 capsules |
| Formulation re: Does NOT Contain | Gluten free |
| Formulation re: Other | Promotes muscle, nerve, bone and heart health |
| Suggested/Recommended/Usage/Directions | Suggested Use: Take 3 capsules daily with food, or as directed by a health care professional. |
| Precautions re: Children | Keep out of reach of children. |
| Physical state | Capsule |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 263073 · label 2022-04-11; 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.