

🧩 Unlock your brain’s full potential with every capsule!
Sports Research® Magnesium L-Threonate Capsules deliver 2000mg of highly bioavailable Magtein®, a patented form of magnesium proven to cross the blood-brain barrier and enhance cognitive function, memory, focus, and restful sleep. These vegan, non-GMO, and gluten-free capsules are manufactured in cGMP-certified US facilities, ensuring premium quality and purity for a one-month supply of 90 easy-to-swallow pills.


















| ASIN | B0B336FCWC |
| Best Sellers Rank | #1,674 in Health & Household ( See Top 100 in Health & Household ) #40 in Magnesium Mineral Supplements |
| Customer Reviews | 4.7 4.7 out of 5 stars (1,801) |
| Date First Available | January 1, 2022 |
| Item model number | FG377 |
| Manufacturer | Sports Research |
| Product Dimensions | 2.45 x 2.45 x 4.5 inches; 0.07 ounces |
E**D
Helps Me Stay Clear and Focused
I’ve noticed a real lift in clarity and day‑to‑day focus with these Magnesium L‑Threonate capsules. They’re easy to take, well‑formulated, and have earned a steady place in my routine. Everyone responds differently, but this has supported my mental sharpness in a meaningful way.
B**N
Great quality.
Great brand, high quality. Helps with sleep!
Q**Y
Working Well for Better Sleep
Been combining a serving of this with 200 mg L-theanine an hour before bed and I've been sleeping much better since starting this combination. Seems to be a good product, and works well for me. I would say I typically have insomnia 1-2 days per week, and I haven't had any issues with it since starting this and L-theanine.
L**J
Good quality supplement
I like the quality and research behind this brand. This supplement is good quality and potent when taken at the recommended dose.
N**R
Life-Changing Magnesium — Better Sleep & Better Mood!
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!
A**I
The capsules cracked open in the bottle
Great brand and competitive pricing per dosage! I noticed slightly more relaxed during the day and feel some cognitive enhancement. I have not noticed memory improvements yet but I'm hoping I will with consistent use. I still prefer magnesium glycinate as it is cheaper and more relaxing for me. The only problem is that a few of the capsules blew open in the bottle during transit while the bottle remained undamaged.
J**E
good supplement
Threonate is one of the types of magnesium that is recommended for my purpose. This seems to work for me. I bought some previously and plan to buy again.
T**A
will calm your racing mind, subtle relaxation, and eventually helps you fall asleep
I have always been taking mag glycinate as my go-to for muscle recovery and relaxation. but recently heard how this one relaxes the mind/brain so I decided to give this a try for the first time and I totally love it. when I am still jittery from the coffee I had earlier in the day, taking this at night is a game changer. it instantly calms my anxious thoughts and centers me. it also helps me sleep. i always pop a mag for sleep. its the best, no drowsy feeling the next day ONLY IF you don't take it in the middle of the night. and although the dose says 3 capsules, I think 2 works just fine for me.
E**H
Magtein at the best price and it works well. Love the flip top bottle. Just an all around great staple supplement and brand.
M**1
Better than bisglycinate in my opinion
N**.
Great for your sleep quality and stress relief
C**.
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.
G**L
Good shtuff
Trustpilot
2 weeks ago
2 weeks ago