---
product_id: 263865106
title: "Magtein Magnesium L-Threonate Capsules (667mg, 180 Pieces)"
brand: "source naturals"
price: "¥25367"
currency: JPY
in_stock: true
reviews_count: 5
category: "Source Naturals"
url: https://www.desertcart.jp/products/263865106-magtein-magnesium-l-threonate-capsules-667mg-180-pieces
store_origin: JP
region: Japan
---

# 667mg potent dose 180 capsules for 2-month supply secure, tamper-proof packaging Magtein Magnesium L-Threonate Capsules (667mg, 180 Pieces)

**Brand:** source naturals
**Price:** ¥25367
**Availability:** ✅ In Stock

## Summary

> 🧠 Elevate your mind, own your day with Magtein!

## Quick Answers

- **What is this?** Magtein Magnesium L-Threonate Capsules (667mg, 180 Pieces) by source naturals
- **How much does it cost?** ¥25367 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/263865106-magtein-magnesium-l-threonate-capsules-667mg-180-pieces)

## Best For

- source naturals enthusiasts

## Why This Product

- Trusted source naturals brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Long-Lasting Supply:** 180 capsules ensure consistent daily intake for optimal results without frequent reordering.
- • **Cognitive Clarity Boost:** Magtein's unique magnesium L-threonate form supports enhanced brain function and memory.
- • **Highly Rated & Reliable:** 4.6-star rating from over 1,300 users reflects proven satisfaction and effectiveness.
- • **Trusted Quality Assurance:** Secure packaging guarantees product integrity from shelf to your door.
- • **Millennial-Approved Wellness:** Perfect for busy professionals seeking a natural edge in mental performance and stress resilience.

## Overview

Source Naturals Magtein Magnesium L-Threonate Capsules deliver a clinically studied 667mg dose per serving to support cognitive health. Packaged securely in a 180-capsule bottle, this supplement offers a reliable two-month supply trusted by thousands of users with a 4.6-star rating. Ideal for professionals aiming to boost memory, focus, and brain resilience naturally.

## Description

Rich in nutrients, this will be a perfect pick for you. Take it as directed to enjoy the best results. The product will meet your requirements perfectly.

Review: 毎日欠かさず飲んでいます。 安心感があります。 ありがとうございました。
Review: Product arrived on time. I had no issues purchasing

## Features

- Package include: 180 capsules
- Comes with secure packaging
- Take it as directed to enjoy the best results

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00AXTO30G |
| ASIN  | B00AXTO30G |
| Best Sellers Rank | #28,384 in Health ( See Top 100 in Health ) #687 in Mineral Supplements |
| Brand | Source Naturals |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,375) |
| Customer reviews | 4.6 4.6 out of 5 stars (1,375) |
| Date First Available | 8 January 2013 |
| Format | Capsules |
| Is Discontinued By Manufacturer  | No |
| Item model number  | SN2486 |
| Manufacturer  | Source Naturals |
| Product Dimensions  | 3.3 x 3.3 x 4.06 cm; 45.36 g |
| Serving Recommendation | 3 Capsules |
| Units | 180 Count |
| Weight | 0.54 Pounds |

## Product Details

- **Brand:** Source Naturals
- **Flavour:** Unflavored
- **Item form:** Capsules
- **Primary supplement type:** Magnesium
- **Unit count:** 180 Count

## Images

![Magtein Magnesium L-Threonate Capsules (667mg, 180 Pieces) - Image 1](https://m.media-amazon.com/images/I/61K88UFg5JL.jpg)

## Questions & Answers

**Q: 3 capsules contain 2 gm magnesium l-threonate and 144 mg of magnesium.  How much L-threonate is this?   Product label says nothing.**
A: Hi...  The l-threonate is just a metabolite (salt) of vitamin C that is bound to the magnesium as a chelation agent to supposedly make the magnesium more bioavailable, particularly in the brain.  It's not a substance that acts independently, or is counted independently, of the magnesium.  It takes 2 gm of magnesium l-threonate to get 144 mg of actual elemental magnesium, such as you might find in more commonplace magnesium supplements... it's just that binding the magnesium with a chelation agent (in this case l-threonate) may make each mg of magnesium more bioavailable (esp in the brain), than larger amounts of regular magnesium.  Wonder if you're thinking of, and maybe looking for, l-theanine?  That's a totally different substance (supposed to provide a relaxed alertness) from green tea.  If that's what you want, it is available as its own thing.

**Q: why does my bottle show Maltodextrin in the "other ingredients" but on the website label it does not show it?  I bought this based on the ingredients.**
A: This problem needs to be addressed and not pawned off. The June/July2016 reviews have a higher level of complaints. Update the photos if the manufacturer has changed ingredients!

**Q: why 2000 mg in some and 645 mg in others**
A: 2000 mg of magnesium threonate will yield 144 mg of elemental magnesium.  This seems to be the recommended daily dosage.  Three capsules, each containing 645 mg of magnesium threonate will be needed to give a daily dosage of 1935 mg (which is the same as 2000 mg within rounding error).  But some brands use two larger capsules to provide the recommended daily dosage and these may be harder to swallow for some people.

**Q: Is it best to take with food or on empty stomach?**
A: Best on an empty stomach.  I take 2 am and 1 pm.  Directions are 3 per day with 1 taken a few hours before bedtime and 2 taken during the day.  I read that magnesium absorbs best on an empty stomach and some supplement instructions recommend taking that way also.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by 香***子 on 26 May 2025*

毎日欠かさず飲んでいます。 安心感があります。 ありがとうございました。

### ⭐⭐⭐⭐⭐ Review
*by M***R on 4 June 2022*

Product arrived on time. I had no issues purchasing

### ⭐⭐⭐⭐⭐ Review
*by お***る on 15 December 2022*

メンタルの改善を目的にマグテインを購入しました。 目的の効果とは違いますが、不思議と漢字が書けるようになりました。もともと漢字を書くのが苦手で、読めるけど書けない、なんとなくは解るんだけど書けない、みたいな感じだったのですが、マグテインを飲むようになってから不思議と漢字が書けるようになって驚きました。脳に効いているんだと思います。

## Frequently Bought Together

- Source Naturals Magtein Magnesium L-Threonate, 667mg, Supports Focus, Mood, Healthy Memory, Cognitive Function - 180 Capsules
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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-04*