LookCloser.aipublic supplement evidence
Exact product checked · GTIN 00700598638004NATURAL STACKS · checked Aug 10, 2026 · on sale since Jan 23, 2014Package says distributed by: AIDP, Inc.
Quick read · NATURAL STACKS

Natural Stacks MagTech® Magnesium

Checked against public sources on August 10, 2026 · LookCloser does not sell or recommend supplements.

90capsules · 30 servings

Does the marketing hold up?

Listing claim matches the Supplement Facts panel. The label promise and the Supplement Facts amount agree.

Is the dose real?✓Listing and panel agreeboth say 200 mg of Magnesium
What a serving costs$1.13per serving, at the checked price
Is it tested?No testing claim made
Who’s behind it?No exact match in USPTO
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 confirmed1△ support not foundno contradictions · no recalls
The label itself

What the Supplement Facts panel says

Serving size Serving Size: 3 Capsules · 30 servings per container

Magnesium200 mg
from 1000 mg Magtein™ Magnesium L-Threonate1000 mg
from 690 mg Magnesium Glycinate690 mg
from 630 mg Magnesium Taurate630 mg

Printed on the package: Magtein · GLUTEN FREE · NON GMO · VEGAN · PALEO FRIENDLY

We read 4 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

1 promise needs a closer look.

◐Partly confirmed1

“also supports brain health and may improve sleep”

Ingredient evidence exists; on dose: label states 200 mg/serving — about 48% 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 — Magnesium fact sheet ↗
Evidence →

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

△Claimed without support found1

“features Magtein Magnesium L-Threonate which is highly absorbed for optimal benefits and the best clinically tested magnesium”

We found no named, citable study of this product or formula. The claim may rest on ingredient research rather than a trial of this product.

Evidence →
Marketing language, not scored

ADVANCED 3-IN-1 COMPLEX · MAGTECH® Magnesium (90 ct) is the best-selling Cognitive Health Supplement in the Natural Channel

Quick read · 4 useful findings

What is worth knowing.

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

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 200 mg; the photo-read Supplement Facts panel shows Magnesium at 200 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 · 4 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 · 700598638004.

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

Evidence and sources

The brand's store lists this exact barcode as “MagTech® Magnesium” (variant: 90ct) — identity confirmed across retailer listings.

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

Reaching a studied dose costs about $34/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 1.0 serving(s) a day to reach the low end of the studied range (200–420 mg), this product runs roughly $34 per month. A price observation, not a recommendation.

Locked evidence record →Open the full source-linked finding
What remains open 3
  • No FDA recall matched this brand in the current search.
  • We have not found a public label filing for this exact product.
  • Brand ownership is not settled in this record.

These are evidence gaps, not strikes against the product.

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

200 mg per serving — within 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 200 mg of magnesium per serving. Studies we found used 200 mg–420 mg a day, so this sits inside 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
$33.96

$1.13 per labeled serving

matching UPC/GTIN · checked Aug 10, 2026

View on Amazon ↗

Brand website

Exact UPC/GTIN match
$36.95

689 ratings

$1.23 per labeled serving

matching UPC/GTIN · checked Aug 10, 2026

View on 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 ↗

Same UPC/GTIN observed across 2 sellers. Amazon was lowest at $33.96; Brand website was highest at $36.95 — a $2.99 range at check time.

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 10, 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.