Sports Research® Magnesium L-Threonate Capsules 2000mg - High-Absorption Magtein® for Enhanced Brain Health, Memory, Focus & Restful Sleep Support - Vegan · Non-GMO · Gluten Free - 180 Count

A must if you want solid sleep and a great magnesium supplement. Works through the night when you body need it and Sports Research has the highest quality supplements available.

Top quality product! I’ve been taking another brand of magnesium L-Theronate for about a year with some benefit but not very noticeable. I recently switched to this brand, the difference has been very noticeable…like WOW! I take 3 with dinner and now I’m sleeping deeply through the night, waking up feeling refreshed. My mind feels sharper too, more alert during the day. So glad I found this brand, it’s a winner.

I take this every night for sleep. Magnesium L-Threonate crosses the blood brain barrier and helps reduce stress and improve sleep. This seems to be a good brand and consistently helps me get the rest I need.

I've been taking magnesium L-threonate for several months now, and this Sports Research version with Magtein has become a permanent part of my daily stack. Sports Research is a brand I trust across their product line, so picking up their take on this form of magnesium was an easy call. What sets L-threonate apart from other magnesium forms — citrate, glycinate, oxide — is its ability to cross the blood-brain barrier. The Magtein ingredient here is the patented compound developed through MIT research specifically for that purpose, and that's the reason I sought this form out in the first place. For cognitive support: sharper recall, general mental clarity, and the kind of background steadiness that's hard to quantify but noticeable when it's there — this has delivered consistently. The formula itself is clean. Veggie capsules, no unnecessary binders or additives, vegan and gluten-free. The three-capsule daily serving is straightforward to build into a routine, and I've had zero digestive issues, which is a known drawback with some other magnesium forms. Sports Research also manufactures in a cGMP-compliant facility and uses third-party testing, which matters when you're taking something every day long-term. The 180-count size makes the per-serving cost more reasonable for sustained use. If you're already familiar with magnesium supplements and specifically want the cognitive angle rather than just general magnesium repletion, this is a well-formulated, trustworthy option.

While I review a significant number of supplements through the Vine program, this product is a long-standing fixture in my personal stack. Sports Research’s Magtein Magnesium L-Threonate strikes a great balance between ingredient quality, clean formulation, and overall value. ​1. The Blood-Brain Barrier Advantage What makes this product stand out is its use of Magtein, the patented form of magnesium L-threonate. Researchers have observed that this specific compound crosses the blood–brain barrier more readily than standard magnesium salts like citrate or oxide. For a "Sleuth," this is the primary reason to pay the premium for Magtein—it is specifically designed for cognitive and synaptic support. ​2. Authentic Patented Blend Sports Research uses the authentic, standardized Magtein blend. This ensures that the magnesium L-threonate is supported by the correct magnesium salts to achieve precise elemental dosing. This isn’t "filler"—it’s a necessary part of how the patented ingredient is manufactured to ensure consistent potency. ​3. Clean Excipient Profile One of my favorite features here is the clean excipient profile (the list of inactive ingredients used to make the capsule). These capsules use vegetable cellulose and avoid unnecessary additives like artificial binders or stearates. For a daily supplement, having a minimal, low-risk inactive list is a meaningful advantage for long-term health. ​4. Manufacturing and Value Sports Research routinely performs third-party testing for identity, purity, and potency. While Magtein is a more expensive form of magnesium, this version remains reasonably priced without compromising on the genuine complex. The capsules are easy to swallow, have no aftertaste, and represent a well-executed example of a high-tier magnesium supplement. ​Verdict: 5 Stars. It delivers authentic Magtein, clean ingredients, and dependable quality at a fair price. It's an excellent choice for anyone specifically looking for the cognitive benefits of magnesium L-threonate.

Overall I'd say it's good, but it doesn't make me sleepy or tired. It feels like my sleep is lighter, and according to my Fitbit my sleep quality is lower when I take this right before bed. But maybe I need to take more than a single dose? 🤷 Really if your goal is to restore your magnesium stores this seems like a good supplement with few drawbacks. No laxative side effects. Seems to reduce muscle tension caused by vit d supplementation. The main downside is the capsules are huge and a single dose is 3x of them. It makes me feel like I'm taking a lot. In terms of sleep, I had better luck with my magnesium citramate from Thorne. But it had the laxative effect.

Helps me sleep at night. Taking it with dinner

I am a repeat buyer. I see an improvement in my focus and recall. The sleep score on my Apple Watch has increased as well. It’s part of my nightly routine.

Produit de très haute qualité. J'ai vu un changement dès la première nuit avec seulement une capsule au coucher. Relaxation et sommeil amélioré.

Good price for the quality

Works as intended

Good quality help focus

The capsules are so large that I almost choke every other time I take them. It’s really unpleasant and uncomfortable. The brand is beautiful and the product itself is good, but I won’t repurchase simply because the capsules are gigantically oversized. I’ll be looking for an alternative next time.