LookCloser.aipublic supplement evidence
Exact product checked · GTIN 00642893353315NatureBell · checked Aug 14, 2026 · on sale since May 17, 2017🇺🇸 USPTO wordmark owner · Nature Bell, Inc. · CALIFORNIA, USAPackage says manufactured for: Nature Bell · 4380 Mission Blvd, Montclair, CA 91763
Quick read · NatureBell

NatureBell Pure Magnesium Glycinate 500mg Per…

Checked against public sources on August 14, 2026 · LookCloser does not sell or recommend supplements.

240capsules
240servings per container

Does the marketing hold up?

Reviews went from 248 to 370 between July 27, 2025 and August 13, 2026 — 84% of them arrived in a single month. A count that moves steadily is ordinary. A sudden burst is what deserves a closer look.

Is the dose real?✓Listing and panel agreeboth say 90 mg of Magnesium
What a serving costs$0.15per serving, at the checked price
Is it tested?Claimed — no lab or certificate found
Who’s behind it?🇺🇸Nature Bell, Inc.corporation · CALIFORNIA, USA
Is it the real thing?✓Barcode matches outside records
Trouble on record?✓No recalls found

“Couldn’t verify” means we looked and found no public proof — not a mark against the product. Most supplement claims cannot be independently verified by anyone, so grey is the normal state of this industry.

1◖ partly confirmed2? couldn’t verifyno contradictions · no recalls
The label itself

What the Supplement Facts panel says

Serving size 1 Vegetarian Capsule · 240 servings per container

Vitamin C (as ascorbyl palmitate)20 mg
Magnesium (as magnesium glycinate)90 mg
Magnesium Glycinate500 mg

Printed on the package: Third-Party USA Lab Tested · LAB TESTED · cGMP · GMO FREE · Vitamin Angels

We read 3 lines from the package photograph. It is our transcript of the label, not the manufacturer’s panel, and it may be incomplete.

Marketing claims, checked

The checks, one by one

The public sources did not settle the marketing promises on this label.

◐Partly confirmed1

“one of the most bioavailable forms of magnesium, combined with fat-soluble vitamin C to enhance ingredient quality and formulation”

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.

Registry receipt: NIH ODS · vitamin c fact sheet ↗Registry receipt: NIH ODS — Magnesium fact sheet ↗
Evidence →

Ingredient research can support context, but it is not a trial of this exact product.

?Couldn’t verify independently2

“IN USA WITH GLOBAL”

“Made in USA” can describe only final bottling. Ingredient-sourcing records were not located for this product.

Evidence →
“party lab tested for safety and”

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.

Evidence →

We looked and found no public proof. That does not count against the product.

Quick read · 5 useful findings

What is worth knowing.

Headlines first. Open evidence only when you want the source trail.

Needs explanationCan you trust the review pattern?

Reviews went from 248 to 370 between July 27, 2025 and August 13, 2026 — 84% of them arrived in a single month.

A count that moves steadily is ordinary. A sudden burst is what deserves a closer look.

Evidence and sources

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.

Keepa exact-listing historydated count history · exact listing
Locked evidence record →Open the full source-linked finding
CheckedIs the label honest?

Listing claim matches the Supplement Facts panel

The label promise and the Supplement Facts amount agree.

Evidence and sources

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.

Locked evidence record →Open the full source-linked finding
CheckedIs the label honest?

Every ingredient shows its amount · 3 ingredients listed.

Every ingredient shows its real amount — nothing is hidden in a proprietary blend.

Evidence and sources

The panel gives a per-ingredient amount rather than hiding quantities inside a proprietary blend, so each one can be compared to published research.

Locked evidence record →Open the full source-linked finding
CheckedWho is behind it?

The barcode identity checks out · 642893353315.

The barcode matches, so we are checking the right product rather than a look-alike.

Evidence and sources

UPCitemdb resolves 642893353315 to "2 Pack NatureBell Magnesium Glycinate 500mg 180 Capsules Supports Muscle Bone" (Nature Bell) — consistent with this listing.

Locked evidence record →Open the full source-linked finding
Public contextWill you get what you pay for?

Reaching a studied dose costs about $10/month

Comparing cost at a research-relevant amount shows how quickly the package is used and what the routine actually costs.

Evidence and sources

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.

Locked evidence record →Open the full source-linked finding
What remains open 2
  • No FDA recall matched this brand in the current search.
  • We have not found a public label filing for this exact product.

These are evidence gaps, not strikes against the product.

Who owns the brand wordmark?
🇺🇸
Nature Bell, Inc.Corporation · exact supplement-class mark for NATUREBELL
Registration5845207
Registered2019-08-27
AssignmentsNo transfers recorded

Filed address
4951 Holt Blvd, Suite C, Montclair, California 91763, UNITED STATES

USPTO identifies the public owner or applicant behind this brand wordmark. This does not by itself identify the product manufacturer or prove where the product was made. Open USPTO source ↗

Research behind the findings

Dose and research context

The label amount is shown beside the range used in the linked ingredient studies.

Dose vs research

Magnesium

90 mg per serving — below the 200–420 mg/day used in the linked studies.

Linked ingredient research · label amount, not a recommendation
NIH ODS — Magnesium fact sheet ↗PubMed search: magnesium glycinate supplementation ↗
Background reading

What the research says about these amounts

Not a score. Studies disagree with each other and change over time, so this sits beside the evidence rather than counting toward it — it is here so you can read the sources yourself.

The panel lists 90 mg of magnesium per serving. Studies we found used 200 mg–420 mg a day, so this sits below that range.

0studied 200 mg–420 mg

Study ranges differ between trials and change as research changes. This is background reading, not a pass, a failure, or a recommendation.

NIH ODS — Magnesium fact sheet ↗PubMed search: magnesium glycinate supplementation ↗
Where it sells

Price check for this exact product

Amazon

Exact UPC/GTIN match
$36.95

$0.15 per labeled serving

matching UPC/GTIN · checked Aug 15, 2026

View on Amazon ↗

Brand website

Official product-page candidate · UPC absent
$25.95

Official shopping lead; excluded from exact price comparisons.

Magnesium Glycinate 500mg, 240 Veggie Capsules · Default Title. Confirm the package UPC/GTIN before buying.

Check brand website ↗

iHerb

Not confirmed
No exact listing saved

We only show a price when the seller publishes the same barcode as the bottle. We haven’t found that match here.

Search iHerb ↗

Target

Not confirmed
No exact listing saved

We only show a price when the seller publishes the same barcode as the bottle. We haven’t found that match here.

Search Target ↗

Walmart

Not confirmed
No exact listing saved

We only show a price when the seller publishes the same barcode as the bottle. We haven’t found that match here.

Search Walmart ↗

Only one exact price was available at build time; prices change by date, seller, and promotion.

The brand-page price is shown as a shopping lead only. It is excluded from the exact-product price difference because the page does not publish this record's matching UPC/GTIN.

The observed listing and related brand page repeat 500 mg. That confirms cross-page consistency of the published claim, not the product contents.

Reference prices only · no affiliate links · every compared seller must publish the matching UPC/GTIN.

Want to inspect the evidence?

The full report shows every source, the exact unresolved question, and the documentation that would settle it.

Read / share full evidence →

Record built August 14, 2026. Sources: source listing observed at check time · USPTO Trademark Search · Keepa exact-listing history · NIH / published research · certification and regulator records where available. LookCloser publishes evidence and gaps; it does not advise for or against any supplement. Evidence-based corrections welcome.