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

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.

I’ve struggled with insomnia for years and have tried so many different supplements with little to no success. After taking Sports Research® Magnesium L-Threonate, I finally noticed a real difference. My sleep feels deeper, and I fall asleep faster instead of lying awake for hours. I also wake up feeling more rested and less groggy, which has been a huge plus. The capsules are easy to take, and I haven’t experienced any negative side effects. If you’ve been dealing with long-term sleep issues like I have, this is definitely worth trying. It’s been a game changer for me.

I have been using this product for almost a year now and the results are great! Sound sleep and less brain fog. Unlike any otc sleep aid, I have no trouble getting out of bed in the morning. It is one of the few supplements that I will not skip.

This Magnesium Threonate uses the same basic Magtein formula, but has fewer additives and is much more absorbable. If you open the capsule into a glass of water, it dissolves, unlike other brands which clump and float on the surface. The taste of the Sports Research product is neutral and there is just a faint odor of rice powder. The Sports Research product is superior to the other brands I have used. Sports Research Magnesium L-Threonate is my new source of Magnesium. Thank you for making such a good product. Highly recommended and will be buying again. 5 Stars.

This product has really helped me with my memory and getting to sleep. I can sleep more peacefully and wake up feeling less tired. This is the second time I've bought it, I love it. The tablets are easy to swallow.

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.

Great for focus

I’ve been taking these Sports Research Magnesium L-Threonate capsules for about 4 months now, and they are honestly amazing. I originally bought them to help with sleep, and they’ve made a huge difference — I fall asleep easier, stay asleep longer, and wake up feeling more rested instead of groggy. What I didn’t expect was how much they would also improve my mood. Since taking these consistently, I feel calmer, more balanced, and less stressed throughout the day. It really feels like my brain and body just function better on this form of magnesium. This formula absorbs well, doesn’t upset my stomach, and the capsules are easy to take. I’ve tried other types of magnesium, but none of them have worked nearly as well as Magtein. If you’re looking for something to support sleep, focus, or mood, I highly recommend giving these a try. They’ve made a noticeable difference for me, and I’ll definitely keep taking them!

Very relaxing and calmed the anxiety that came with peri-menopause, I use the Magnesium Glycinate and the L-Threonate together at bedtime and it’s made a huge difference in mood and sleep!! I love that Sports Research is such a clean brand!!!

Works as intended

excellent product works well

Great product to help with sleep! I was having trouble sleeping, thinking and overthinking. This gives me a great night's sleep. I think my memory is also better now that I'm taking this. It is the only form of magnesium that crosses the blood-brain barrier. My sports doctor recommended this form of magnesium.

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.