Nutricost Magtein, Double Wood Magtein, and Life Extension Neuro-Mag all list the same patented active ingredient on their Supplement Facts panels: Magnesium L-Threonate as Magtein. The difference is not the molecule. The difference is the brand printed on the bottle, the capsule count per container, and the cost per gram of magnesium L-threonate. Nutricost positions at the budget end of the Magtein aisle. Same patented ingredient. Fewer premium line items on the label. Lower sticker price. We pulled the ingredient panels on all three to show exactly what is identical and what you save by choosing the value brand.
Nutricost Magtein: The Supplement Facts Panel, Line by Line
The label lists one active ingredient: Magnesium L-Threonate as Magtein, a patented magnesium compound. The capsule format uses standard excipients. No blends. No additional active compounds. One patented ingredient in a budget-brand bottle.
| Label Line Item | Nutricost Magtein |
|---|---|
| Active Ingredient | Magnesium L-Threonate (as Magtein) |
| Patented Ingredient | Magtein — same patented compound used by Double Wood and Life Extension |
| Format | Capsules |
| Other Ingredients | Standard capsule excipients (gelatin, rice flour, magnesium stearate) |
| Artificial Additives | None listed on label |
| Testing Disclosure | Third-party tested for purity and potency (per brand disclosure) |
| Cost Position (vs. Magtein Competitors) | Lowest cost per gram of Magtein among major brands |
Magtein is a patented, trademarked ingredient. When a supplement label lists “Magnesium L-Threonate as Magtein,” it means the raw material was sourced from the patent holder, AIDP Inc. The ingredient inside a Nutricost Magtein capsule and the ingredient inside a Life Extension Neuro-Mag capsule come from the same patent holder. The brand on the bottle is the variable. The raw material supply chain is not.
Buying Nutricost Magtein instead of Life Extension Neuro-Mag is like buying generic acetaminophen instead of Tylenol. The active ingredient — acetaminophen in one case, patented Magtein in the other — is chemically identical and comes from the same type of supplier. The store brand costs less because you are not paying for the name printed on the bottle, the marketing budget, or the fancier label design. Same active. Same patent holder upstream. Different brand name printed on the front. Lower price at checkout.
Nutricost vs. Double Wood vs. Life Extension: Same Magtein, Three Brand Tiers
All three products list Magnesium L-Threonate as Magtein on their Supplement Facts panels. The differences are in brand tier, capsule count per bottle, testing certifications, and cost per gram.
| Label Spec | Nutricost Magtein | Double Wood Magtein | Life Extension Neuro-Mag |
|---|---|---|---|
| Active Ingredient | Magnesium L-Threonate (Magtein) | Magnesium L-Threonate (Magtein) | Magnesium L-Threonate (Magtein) |
| Patented Ingredient | Magtein | Magtein | Magtein |
| Brand Tier | Budget/value brand | Mid-tier nootropic brand | Premium longevity brand |
| Third-Party Testing | Third-party tested (per brand disclosure) | Third-party tested (per brand disclosure) | Third-party tested; brand-level manufacturing certifications |
| Cost per Gram of Magtein (Relative) | Lowest | Moderate | Highest |
The ingredient is identical across all three labels. The price difference is driven by brand positioning, bottle count, and manufacturing overhead. Nutricost is the generic-brand Magtein. Double Wood is the mid-tier nootropic specialist. Life Extension is the premium longevity brand. All three pull from the same patented raw material supply chain.
Who Nutricost Magtein Is For, Based on the Label
Match the brand tier and cost position to your buying criteria. Nutricost Magtein is the value play in a category where the active ingredient is identical across brands.
- The Budget-First Buyer: Nutricost lists the same patented Magtein ingredient at the lowest cost per gram among major brands. If magnesium L-threonate is the ingredient you want and cost per gram is the primary buying criterion, the Nutricost label delivers the same active at the lowest price.
- The First-Time Magtein Buyer: Nutricost’s lower price per bottle makes it the lowest-commitment entry point into the Magtein category. If you want to test whether the patented ingredient format fits your stack before committing to a higher-priced brand, Nutricost is the least expensive way to sample the category.
- The Simple-Formula Buyer: The Supplement Facts panel lists one active ingredient — magnesium L-threonate as Magtein — with standard capsule excipients. No additional active compounds. No blends. One line item on the active panel. Clean and simple.
- The Brand-Premium Buyer: If the name on the bottle matters — if you prefer Life Extension’s longevity-brand positioning or Double Wood’s nootropic-specialist branding — those products list the same Magtein ingredient with higher manufacturing prestige. Same active. Different brand equity. Higher price. See Double Wood Lion’s Mane for another example of the mid-tier nootropic brand’s approach.
- The High-Elemental-Magnesium Buyer: Magnesium L-threonate contains a lower percentage of elemental magnesium by weight compared to magnesium citrate or magnesium glycinate. This is a characteristic of the Magtein compound itself, not a Nutricost-specific spec. If total elemental magnesium per dose is the buying criterion, magnesium L-threonate is not the category. Magnesium glycinate or citrate powder lists higher elemental magnesium per gram.
Nutricost Magtein: Pros and Cons, from the Ingredient Panel
What’s on the Label
- Patented Magtein Ingredient: Magnesium L-Threonate as Magtein — the same patented compound listed on Life Extension and Double Wood labels. The raw material patent holder is AIDP Inc. The active ingredient supply chain is identical across brands.
- Lowest Cost per Gram: Nutricost positions as the budget brand in the Magtein category. Same patented ingredient. Lower sticker price. Higher value per dollar on the active compound.
- Single Active Ingredient: One line item on the Supplement Facts panel. No blends. No additional active compounds. No stimulants. No proprietary matrices.
- Third-Party Tested: Nutricost discloses third-party testing for purity and potency. Standard for the category. Not a product-level certification mark like USP Verified.
- Clean Excipient Panel: Standard capsule excipients only — gelatin, rice flour, magnesium stearate. No artificial colors, flavors, or preservatives listed.
The Brand Trade-offs
- Budget Brand Positioning: Nutricost is not a premium or longevity-branded manufacturer. The label design, brand equity, and manufacturing prestige are lower than Life Extension.
- No Product-Level Certification Mark: Third-party tested per brand disclosure. No USP Verified, NSF Certified for Sport, or Informed Choice mark on the label.
- Lower Elemental Magnesium per Gram: Magnesium L-threonate as a compound contains less elemental magnesium by weight than magnesium glycinate or magnesium citrate. This is a property of the Magtein compound, not a Nutricost deficiency. All three Magtein brands share this characteristic.
- Capsule Count per Bottle Varies: Bottle sizes and capsule counts vary by SKU. Always verify the capsule count and magnesium amount per capsule on the current listing before calculating cost per gram.
Nutricost Magtein FAQ: Label Math, Patented Ingredients, and Brand Comparisons
- What does “as Magtein” mean on the Supplement Facts panel?
- Magtein is a trademarked, patented form of magnesium L-threonate held by AIDP Inc. When a supplement label lists “Magnesium L-Threonate (as Magtein),” it means the raw material was sourced from the patent holder under a licensing agreement. The same trademark appears on Life Extension Neuro-Mag and Double Wood Magtein labels. The active ingredient supply chain is identical across all three brands.
- Is the magnesium inside a Nutricost capsule the same as Life Extension Neuro-Mag?
- Yes, at the raw material level. Both labels list Magnesium L-Threonate as Magtein. Both source the patented ingredient from AIDP Inc. The capsule, the bottle, the brand name, and the price tag differ. The active compound is the same patented molecule.
- Why does Nutricost Magtein cost less than Life Extension Neuro-Mag?
- The price difference is driven by brand positioning, not ingredient quality. Nutricost is a budget supplement brand with lower manufacturing overhead, simpler packaging, and minimal marketing spend. Life Extension is a premium longevity brand with higher manufacturing certifications, more elaborate packaging, and a brand equity premium built into the retail price. Same patented ingredient. Different brand tiers. The price gap is the brand premium, not the ingredient premium.
- Does magnesium L-threonate contain less elemental magnesium than other forms?
- Yes. Magnesium L-threonate as a compound contains a lower percentage of elemental magnesium by weight compared to magnesium glycinate, magnesium citrate, or magnesium oxide. This is a structural property of the Magtein molecule itself. All three Magtein brands — Nutricost, Double Wood, and Life Extension — list identical magnesium amounts per gram because they use the same compound.
- How do I compare cost across different Magtein bottle sizes?
- Divide the bottle price by the total grams of magnesium L-threonate in the container (magnesium amount per capsule × capsule count). That gives you cost per gram of Magtein. Compare that number across Nutricost, Double Wood, and Life Extension. Nutricost consistently produces the lowest cost per gram.
Nutricost Magtein Final Verdict: Same Patented Ingredient, Lowest Cost per Gram
Nutricost Magtein lists the same active ingredient — Magnesium L-Threonate as Magtein — as Life Extension Neuro-Mag and Double Wood Magtein. The active compound is patented, trademarked, and sourced from the same raw material supplier across all three brands. Nutricost wins on cost per gram by a clear margin. Life Extension wins on brand prestige and manufacturing certifications. Double Wood sits in the middle on both price and brand equity. If you want the patented Magtein ingredient at the lowest possible price per gram, the Nutricost label is the budget answer. If you want the same ingredient in a premium-brand bottle, Life Extension is the alternative at a higher price.
Verdict: Three Magtein Labels, One Patented Ingredient, Three Price Tiers
Same Magtein. Same patent holder. Same active ingredient on all three Supplement Facts panels. Nutricost costs the least. Life Extension costs the most. Pick the brand tier that matches your budget.
*Prices, capsule counts, and formulations subject to change. Verify the Supplement Facts panel on the live listing before purchase. Statements have not been evaluated by the FDA. These products are not intended to diagnose, treat, cure, or prevent any disease.
The Magnesium L-Threonate Lexicon: Terms on the Label
- Magtein (Magnesium L-Threonate)
- A patented, trademarked magnesium compound held by AIDP Inc. Listed on supplement labels as “Magnesium L-Threonate (as Magtein).” The “as Magtein” designation indicates the raw material was sourced from the patent holder under license. Not a generic magnesium compound. A branded, patent-protected ingredient with a single-source raw material supply chain.
- Magnesium L-Threonate
- A magnesium salt of L-threonic acid. The compound form listed on Magtein-brand supplement labels. Contains a lower percentage of elemental magnesium by weight compared to magnesium glycinate or magnesium citrate. This is a structural property of the molecule, not a brand-specific characteristic.
- Patented Ingredient
- An ingredient protected by active patents held by the developer. Magtein is patented by AIDP Inc. Brands that list “as Magtein” on the label have licensed the ingredient from the patent holder. Brands that list generic “Magnesium L-Threonate” without the Magtein trademark may or may not source from the patent holder. The trademark is the supply chain signal.
- Elemental Magnesium
- The actual magnesium content of a magnesium compound, measured in milligrams. Magnesium L-threonate contains a lower percentage of elemental magnesium by weight than other common magnesium forms. The Supplement Facts panel lists the total compound weight, not the elemental magnesium content. The elemental amount is calculated from the compound weight based on the molecular formula.
- AIDP Inc.
- The patent holder and raw material supplier for Magtein. Based in California. Licenses the Magtein trademark and supplies the patented magnesium L-threonate compound to supplement brands including Nutricost, Double Wood, and Life Extension. The upstream supplier is the same across all three brands compared in this article.
Keep Reading: Magnesium & Supplement Brand Comparisons
- Life Extension NAD+ Review — another Life Extension premium-brand supplement for comparison against the Nutricost budget approach.
- Double Wood Lion’s Mane Review — the mid-tier nootropic brand’s mushroom supplement with a similar brand-positioning strategy to their Magtein.
- Best Thorne Supplements for Athletes — how premium-brand supplement labels compare across categories.
- Sports Research D3 + K2 Review — a mid-tier brand comparison in the vitamin category, relevant for buyers comparing brand tiers.
- Mushroom Supplement Spec Guide — how patented vs. generic ingredients appear across supplement labels in a different category.
