--- product_id: 263865106 title: "Source Naturals Magtein Magnesium L-Threonate Capsules (667mg, 180 Pieces)" brand: "source naturals" price: "$166.46" currency: USD in_stock: true reviews_count: 5 category: "Source Naturals" url: https://www.desertcart.us/products/263865106-source-naturals-magtein-magnesium-l-threonate-capsules-667mg-180-pieces store_origin: US region: United States of America --- # 180 easy-to-take capsules per bottle Secure, tamper-proof packaging 667mg Magnesium L-Threonate per capsule Source Naturals Magtein Magnesium L-Threonate Capsules (667mg, 180 Pieces) **Brand:** source naturals **Price:** $166.46 **Availability:** βœ… In Stock ## Summary > 🧠 Elevate your mind, own your day β€” don’t let brain fog hold you back! ## Quick Answers - **What is this?** Source Naturals Magtein Magnesium L-Threonate Capsules (667mg, 180 Pieces) by source naturals - **How much does it cost?** $166.46 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/263865106-source-naturals-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 - β€’ **Long-Lasting Supply:** 180 capsules per bottle ensure a 6-month supply when taken dailyβ€”stay ahead in your wellness game without frequent reorders. - β€’ **Brain-Boosting Magnesium:** 667mg of highly bioavailable Magnesium L-Threonate designed to cross the blood-brain barrier for enhanced cognitive support. - β€’ **Trusted Quality & Safety:** Secure, tamper-proof packaging guarantees product integrity and peace of mind with every purchase. - β€’ **Unflavored & Easy to Use:** Neutral, unflavored capsules that fit seamlessly into your daily routine, with the option to open and mix for personalized intake. - β€’ **Clinically Inspired Formula:** Formulated to support learning, memory, and mental clarityβ€”perfect for busy professionals seeking sharper focus and reduced anxiety. ## Overview Source Naturals Magtein Magnesium L-Threonate Capsules deliver 667mg of a patented magnesium compound per dose, clinically shown to cross the blood-brain barrier and support cognitive function, memory, and mental clarity. With 180 capsules per bottle, this unflavored supplement offers a secure, long-lasting supply designed for professionals aiming to optimize brain health and reduce anxiety 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: Good - γ¨γ£γ¦γ‚‚θ‰―γ„γ§γ™γ€‚ι ­γŒγ‚Ήγƒƒγ‚­γƒͺします。 睑眠が深くγͺγ£γŸζ§˜γ«ζ„Ÿγ˜γΎγ™γ€‚ Review: I began to feel this comforting sense of peace and joy. Since I have some genetic issues with absorbing ... - I have been taking Magtein for several months. After just a few days, I began to feel this comforting sense of peace and joy. Since I have some genetic issues with absorbing folate, I have been taking numerous supplements for years to treat a number of conditions. Hence, I am already on some of the vitamins and minerals that should be taken with Magnesium. Especially, B6 and D3. Off and on over the years I would take Magnesium to treat restless legs, but it was only sporadic and not l-threonate. Knowing there is a strong family history of dementia, I decided to switch to Magtein in the hopes that it might delay the onset of Alzheimer's. Not for one minute do I believe this will be a miracle cure, but it might be part of a larger arsenal of preventative measures. Regardless, this is now one of the top 5 things I have discovered to improve my daily life with lessened anxiety and heightened clarity of thought and deeper sleep. I recommended this to my adult son and he promptly hijacked my bottle for himself! I am making him pay me back. He has suffered from anxiety for over a decade and cannot tolerate the side effects of numerous anti-anxiety prescriptions. After taking this, he reports his anxiety has lessened a great deal and that his wife is grateful. He also reports that he had been experiencing brain fog and had begun slurring some of his words. Those two things are now better. This is the first medication/supplement he has tried that he has wanted to keep taking other than a multivitamin. We are waiting to see how this affects my mother who is in the middle stages of Alzheimer's. I am hopeful that it will also ease her anxiety and I don't have any unrealistic expectations that it will treat her dementia. But, if it does . . . wouldn't that be great! Alas, anything that will help keep her calm is a good thing. She has had very bad reactions to prescriptions in the past and refuses anything "for her brain." We can open the capsule and mix the powder into her food if she refuses it in pill form. We have only been using this for a week and just one a day, so too early to report. ## Features - Package include: 180 capsules - Comes with secure packaging - Take it as directed to enjoy the best results ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00AXTO30G | | Best Sellers Rank | #16,628 in Health ( See Top 100 in Health ) #441 in Mineral Supplements | | Brand | Source Naturals | | Brand Name | Source Naturals | | Customer Reviews | 4.6 out of 5 stars 1,386 Reviews | | Flavor | Unflavored | | Flavour | Unflavored | | Item Form | Capsules | | Item Weight | 0.1 Pounds | | Item form | Capsules | | Manufacturer | Source Naturals | | Manufacturer Part Number | SN2486 | | Model Number | SN2486 | | Number of Items | 1 | | Primary Supplement Type | Magnesium | | Primary supplement type | Magnesium | | Product Benefits | for Learning and Memory | | Product benefits | for Learning and Memory | | UPC | 021078024866 | | Unit Count | 180 Count | | Unit count | 180 Count | ## Product Details - **Brand:** Source Naturals - **Flavour:** Unflavored - **Item form:** Capsules - **Primary supplement type:** Magnesium - **Unit count:** 180 Count ## Images ![Source Naturals 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 ### ⭐⭐⭐⭐⭐ Good *by A***N on 13 April 2026* γ¨γ£γ¦γ‚‚θ‰―γ„γ§γ™γ€‚ι ­γŒγ‚Ήγƒƒγ‚­γƒͺします。 睑眠が深くγͺγ£γŸζ§˜γ«ζ„Ÿγ˜γΎγ™γ€‚ ### ⭐⭐⭐⭐⭐ I began to feel this comforting sense of peace and joy. Since I have some genetic issues with absorbing ... *by T***N on 13 October 2015* I have been taking Magtein for several months. After just a few days, I began to feel this comforting sense of peace and joy. Since I have some genetic issues with absorbing folate, I have been taking numerous supplements for years to treat a number of conditions. Hence, I am already on some of the vitamins and minerals that should be taken with Magnesium. Especially, B6 and D3. Off and on over the years I would take Magnesium to treat restless legs, but it was only sporadic and not l-threonate. Knowing there is a strong family history of dementia, I decided to switch to Magtein in the hopes that it might delay the onset of Alzheimer's. Not for one minute do I believe this will be a miracle cure, but it might be part of a larger arsenal of preventative measures. Regardless, this is now one of the top 5 things I have discovered to improve my daily life with lessened anxiety and heightened clarity of thought and deeper sleep. I recommended this to my adult son and he promptly hijacked my bottle for himself! I am making him pay me back. He has suffered from anxiety for over a decade and cannot tolerate the side effects of numerous anti-anxiety prescriptions. After taking this, he reports his anxiety has lessened a great deal and that his wife is grateful. He also reports that he had been experiencing brain fog and had begun slurring some of his words. Those two things are now better. This is the first medication/supplement he has tried that he has wanted to keep taking other than a multivitamin. We are waiting to see how this affects my mother who is in the middle stages of Alzheimer's. I am hopeful that it will also ease her anxiety and I don't have any unrealistic expectations that it will treat her dementia. But, if it does . . . wouldn't that be great! Alas, anything that will help keep her calm is a good thing. She has had very bad reactions to prescriptions in the past and refuses anything "for her brain." We can open the capsule and mix the powder into her food if she refuses it in pill form. We have only been using this for a week and just one a day, so too early to report. ### ⭐⭐⭐⭐⭐ Good *by N***γ‚― on 1 March 2026* Nice staff ## Frequently Bought Together - Source Naturals Magtein Magnesium L-Threonate, 667mg, Supports Focus, Mood, Healthy Memory, Cognitive Function - 180 Capsules - SlowMag Muscle + Heart Magnesium Chloride with Calcium Supplement to Support Muscle Relaxation, Occasional Muscle Cramping & Heart Health, High Absorption, 180 Count - Jarrow Formulas Extra Strength Methyl B-12 1000 mcg & Methyl Folate 400 mcg + P-5-P, Dietary Supplement for Cellular Energy Metabolism and Cardiovascular Support, 100 Chewable Tablets, 100 Day Supply --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/263865106-source-naturals-magtein-magnesium-l-threonate-capsules-667mg-180-pieces](https://www.desertcart.us/products/263865106-source-naturals-magtein-magnesium-l-threonate-capsules-667mg-180-pieces) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-06-10*