Every ingredient amount is disclosed
The panel gives a per-ingredient amount rather than hiding quantities inside a proprietary blend, so each one can be compared to published research.
Full record · 642893353315 · back to the summary
NatureBell Pure Magnesium Glycinate 500mg Per Serving
Exact product checkedGTIN 00642893353315 · checked 2026-08-14
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How to read this report
What this is. We compare what a listing claims against what public records show — label arithmetic, barcode registries, NIH’s label catalog, FDA enforcement data, certification registries, and published research. Every statement below traces to one of those.
What the states mean. Confirmed = an outside source agrees. Contradicted = an outside source disagrees. Caution = something needs explaining. No data = we looked and found nothing — a gap, not a strike.
What it is not. A clean record is not an endorsement and never proof a product works. A thin record is not an accusation. We publish evidence and gaps; the conclusion is yours. Nothing here is medical advice.
Something wrong? Every figure is meant to be checkable — sources are named and linked. Send a correction and we’ll fix the record.
Panel, decoded
The 90 mg magnesium (as magnesium glycinate) claim matches the panel
MARKETING90 mg — per-serving claim
PANELMagnesium (as magnesium glycinate) 90 mg — same amountMagnesium Glycinate 500 mg
matches panelWe did the comparison: the listing claims 90 mg of magnesium (as magnesium glycinate), and the listing-image panel shows 90 mg magnesium (as magnesium glycinate) 1 vegetarian capsule. Those amounts agree. This is internal consistency, not independent lab testing.
| Panel row | Amount | %DV | What to notice |
|---|---|---|---|
| Vitamin C (as ascorbyl palmitate) | 20 mg | — | |
| Magnesium (as magnesium glycinate) | 90 mg | — | |
| Magnesium Glycinate | 500 mg | — |
FDA rules (21 CFR 101.36) require the amount of each dietary ingredient per serving unless hidden in a listed “proprietary blend” (legal, but a transparency yellow flag). A label stating no amount at all is non-compliant — a checkable red flag. This panel states amounts; any remaining comparison concerns the front-label framing.
vision:claude-cli:subscription Amounts are shown as listed panel data, not independently lab-tested contents.
Every check we ran
Confirmed evidence
What checked out3
These checks found support in the public record. They confirm specific facts, not the product as a whole.
Confirmed
Exact trademark owner identified
USPTO lists Nature Bell, Inc. (CORPORATION) in CALIFORNIA, USA for the exact brand wordmark. This identifies the USPTO mark owner or applicant; it does not by itself prove who manufactures or sells this product.
Barcode confirmed in an outside database
UPCitemdb resolves 642893353315 to "2 Pack NatureBell Magnesium Glycinate 500mg 180 Capsules Supports Muscle Bone" (Nature Bell) — consistent with this listing.
Documented concerns
What needs caution1
These are documented contradictions or claims that need more evidence. They are separate from missing data.
Reviews arrived in a burst, not gradually
The dated series runs from 248 written reviews on July 27, 2025 to 370 on August 13, 2026. Up to 312 written reviews were added within a single ~30-day window — 84% of the total. Sudden bursts are the usual fingerprint of incentivized or bought reviews; a steady climb is not.
Unresolved public record
What is still missing11
We looked for these signals but could not settle them from public sources. A gap is not a strike.
Label math withheld — variant ambiguity
Multi-pack listing (pack of 2) — the stated weight may cover all packs, so per-serving mass can't be pinned. Arithmetic runs only when every number provably belongs to the same product size.
“Lab tested” claimed, but no lab or report named
The observed listing and a related brand product page both claim third-party testing. Neither names the laboratory or links a product- or lot-specific report. The related page does not publish this record's UPC. Repeating the claim across two pages confirms the brand publishes it, not that testing occurred. NSF, IFOS, USP, and Informed-Sport were not checked in this record.
Listing claim matches the label panel
The listing claims 90 mg; the photo-read Supplement Facts panel shows Magnesium (as magnesium glycinate) at 90 mg per serving — the listing text and its photo-read panel agree; this is internal consistency, not independent testing.
Magnesium amount, in daily-intake context
label states 90 mg/serving — about 21% of the adult daily reference (adult RDA 310–420 mg elemental; NIH sets 350 mg/day as the supplemental upper level for elemental magnesium). A single serving isn’t meant to supply a full day, so this is context, not a shortfall. Caveat: chelate labels (glycinate, citrate) often state compound mass, which reads ~5–7× higher than elemental magnesium — the Supplement Facts panel settles which is meant. Sources: NIH ODS — Magnesium fact sheet, PubMed search: magnesium glycinate supplementation.
Cost to reach a studied dose
At 2.2 serving(s) a day to reach the low end of the studied range (200–420 mg), this product runs roughly $10 per month. A price observation, not a recommendation.
Research context is available for the listed ingredients
Published sources describe how magnesium have been studied. This is ingredient context only; the record does not establish that this product delivers the studied dose or outcome. Sources: NIH ODS — Magnesium fact sheet, PubMed search: magnesium glycinate supplementation.
Public label filing not saved
We have not found a public label filing for this exact product. That is a gap in our records, not evidence that no filing exists.
No recall found — which is not the same as being tested
This means only that no enforcement record matched the brand name — it does not mean the product was tested, reviewed, or cleared by FDA. New and untested products also have no recall records.
This item belongs to a catalog variation family
The paid catalog links this exact item to a parent listing. Review counts on public product pages may be shared across sizes, flavors, or other variants, so the count history is listing context — not evidence that reviewers received or tested this exact variant.
180-day review-count history is on file
Exact-listing history records written-review counts from 246 on 2025-07-20 to 370 on 2026-08-13 (net +124). Count movements can reflect sales, listing variants, collection resets, or moderation; this history does not establish whether reviews are authentic.
Package and trademark records name different responsible entitie
The package says manufactured for: Nature Bell, 4380 Mission Blvd, Montclair, CA 91763. USPTO names Nature Bell, Inc. as the exact wordmark owner. That can be a normal distributor, manufacturer, or licensing relationship; the saved records do not establish the relationship.
What to ask and check
What would settle the open questions
Why is this shown?
Everything we couldn’t verify is something a person can still ask about. Rather than leave gaps sitting as dead ends, we turn each one into a specific question — the exact document, citation, or number that would settle it — plus the things you can confirm yourself with the bottle in your hand.
Ask the brand or seller
1
Can you send the certificate of analysis (COA) for the lot number on my bottle?
A real COA names the testing laboratory, the test date, the lot it covers, and what was measured. “Third-party tested” with no document behind it is a marketing sentence.
2
Is this label filed with NIH’s Dietary Supplement Label Database (DSLD)?
Filing is voluntary, so absence proves nothing — but a filed label puts the full ingredient table on public record where anyone can read it.
3
Where are the ingredients sourced, and where is the product manufactured?
“Made in USA” can describe only the final bottling step. Ask which country the actives came from and whether the facility is audited.
Most brands and sellers publish a contact route. A clear answer adds evidence to the record; no answer leaves the question open.
Check for yourself — no one’s permission needed
1
Compare the panel on the bottle in your hand to the one shown in this record.
Ours was read from listing photos and can contain reading errors. The physical label is the source of truth — if they disagree, tell us and we’ll correct the record.
2
Scan the barcode on the package and confirm it reads 642893353315.
A mismatch between the barcode on the box and the one on the listing is worth pausing over — it can indicate a different variant, a repack, or a counterfeit.
3
Check the lot number and expiry on the bottle against any COA you’re given.
A certificate that doesn’t name your lot doesn’t describe what you’re holding.
These are the open questions on this specific record — not a warning about the product, and not a suggestion to buy or avoid it. Getting them answered is how you decide for yourself.
What the listing promises — claim by claim
Why is this shown?
A listing’s promises are the reason people buy. Each one gets its own row: what was promised, what evidence would settle it, and what we could actually find. We never call a claim false — only whether proof proportionate to it exists on the public record.
| Claim | Status | What we found |
|---|---|---|
| Quality-testing claim “…3rd party lab tested for safety and potency.…” | Claimed, not verifiable We looked for: the observed listing, saved brand product page, any linked COA or test report; NSF, IFOS, USP, Informed-Sport were not queried | No named laboratory or lot-specific certificate was found for this exact product. A related brand page repeats a testing claim but names no issuer; its UPC is not published. NSF, IFOS, USP, and Informed-Sport were not checked in this record. This is a public-evidence limit, not a finding that testing did not occur. |
| Origin claim “…MADE IN USA WITH GLOBAL INGREDIENTS…” | Claimed, not verifiable We looked for: customs records or label filings showing where ingredients were sourced and where it was made | “Made in USA” can describe only final bottling. Ingredient-sourcing records were not located for this product. |
| Benefit claim “…Features one of the most bioavailable forms of magnesium, combined with fat-soluble vitamin C to enhance ingredient quality and formulation balance.…” | Partly supported We looked for: whether the ingredient doses on the label match the doses used in published research | Ingredient evidence exists; on dose: label states 90 mg/serving — about 21% of the adult daily reference (adult RDA 310–420 mg elemental; NIH sets 350 mg/day as the supplemental upper level for elemental magnesium). A single serving isn’t meant to supply a full day, so this is context, not a shortfall. Caveat: chelate labels (glycinate, citrate) often state compound mass, which reads ~5–7× higher than elemental magnesium — the Supplement Facts panel settles which is meant. |
“No evidence located” does not mean a claim is false — it means the seller has not put evidence proportionate to the claim on the public record, and we could not find any. Absence of proof is not proof of absence.
This label vs. the doses studied
Why is this shown?
An ingredient can be well-studied at one amount and barely studied at the amount in your bottle. This lines the label up against the doses researchers actually used. It answers ‘are these the same numbers?’ — never ‘should you take this?’
| Ingredient | Where this label sits | Reading |
|---|---|---|
| Magnesium (as magnesium glycinate) | shaded = doses used in studies (200 mg–420 mg) · bar = this label | 90 mg — below the studied range |
Matching a studied dose does not mean the product works, and missing it does not mean it fails — it shows whether the label and the research are talking about the same amounts. Not a recommendation to take any amount.
Documented cautions
- magnesium — daily oral use; chelated forms (glycinate) are studied for absorption — note labels may state compound mass rather than elemental magnesium, which differs ~7-fold
Statements from published sources about these ingredients — not advice about this product, and not a complete safety review. Anyone taking medication should talk to a pharmacist or clinician.
Verifiability profile — 4 of 6 public signals
✓ Per-serving dose established✓ UPC / GTIN published✓ Supplement Facts visible in photos✓ Brand's own store found· Found in NIH's label catalog (DSLD) — not published· Third-party lab named or registry-certified — not published
What this listing gives the public to check. Publishing these signals doesn't prove quality — but withholding them means claims can only be taken on faith.
Identity
| UPC (barcode) — also our record ID | 642893353315 — via source listing UPC |
| Brand | NatureBell |
| Source listing identifier | B07RD4DFNZ |
| Retailer listing title | NatureBell Pure Magnesium Glycinate 500mg Per Serving, 2 Pack, 480 Cap… show full titleNatureBell Pure Magnesium Glycinate 500mg Per Serving, 2 Pack, 480 Capsules |
| USPTO brand owner | Nature Bell, Inc. · CORPORATION · CALIFORNIA, USA |
| Owner filed address | 4951 Holt Blvd, Suite C, Montclair, California 91763, UNITED STATES |
From the label (photo-read)
| Serving size | 1 Vegetarian Capsule |
| Servings per container | 240 |
| Pack statement | 240 Vegetarian Capsules |
| Badges printed on pack | Third-Party USA Lab Tested, MADE IN USA WITH GLOBAL INGREDIENTS, 3RD PARTY CERTIFIED FOR PURITY & POTENCY, LAB TESTED, MANUFACTURED IN A cGMP FACILITY, cGMP, GMO FREE, Vitamin Angels |
Supplement Facts panel (photo-read):
| Ingredient | Amount per serving | Reading confidence |
|---|---|---|
| Vitamin C (as ascorbyl palmitate) | 20 mg | High clearly legible in the photo |
| Magnesium (as magnesium glycinate) | 90 mg | High clearly legible in the photo |
| Magnesium Glycinate | 500 mg | High clearly legible in the photo |
Claims printed on the packaging:
“pure” · “500 mg (90 mg elemental magnesium) per serving” · “formulated with fat-soluble vitamin C” · “240 Vegetarian Capsules” · “Dietary Supplement” · “FREE OF: Wheat, gluten, soy, dairy & tree nuts.” · “Double Sealed” · “UV Protected Amber Bottle”
Read by a vision model from 8 listing photos — verbatim extraction; OCR errors possible. Spot a mistake? It will be corrected on review.
Where it sells
| Seller | Price |
|---|---|
| Retailer listing ↗ | $36.95 checked Aug 14, 2026 — varies by variant/session; price history pending |
Official brand domain: www.NatureBellUSA.com. This storefront does not expose a complete public catalog count.
Reference links for identification only — LookCloser has no affiliate relationships and earns nothing from any link on this page.
Ingredient science — NIH references
Vitamin C — NIH ODS · MedlinePlus · PubMed (11,019) · UL 2000 mg (total intake, adults)
Magnesium — NIH ODS · MedlinePlus · PubMed (11,814) · UL 350 mg (SUPPLEMENTAL magnesium only (not from food))
Reference data from the NIH Office of Dietary Supplements, IOM Dietary Reference Intakes, and PubMed. A Tolerable Upper Intake Level is a documented reference figure, not a safety verdict — both the listed amount and the reference are shown for your own judgment. LookCloser gives no medical advice.
Related research & consistency
magnesium — NIH ODS — Magnesium fact sheet · PubMed search: magnesium glycinate supplementation · WebMD: magnesium · ClinicalTrials.gov — 3,206 registered studies
ℹ Dosage: label states 90 mg/serving — about 21% of the adult daily reference (adult RDA 310–420 mg elemental; NIH sets 350 mg/day as the supplemental upper level for elemental magnesium). A single serving isn’t meant to supply a full day, so this is context, not a shortfall. Caveat: chelate labels (glycinate, citrate) often state compound mass, which reads ~5–7× higher than elemental magnesium — the Supplement Facts panel settles which is meant.
ℹ Use pattern in research: daily oral use; chelated forms (glycinate) are studied for absorption — note labels may state compound mass rather than elemental magnesium, which differs ~7-fold.
These notes state where label numbers and marketing framing sit relative to published research — documentation for your own judgment, not medical advice. LookCloser does not advise for or against taking any supplement.
Record 642893353315 · built August 14, 2026 · lookcloser.ai · corrections@lookcloser.ai