NOW Foods

NOW Foods Supplements Magtein with patented form of Magnesium Mg Cognitive Support 90 Veg Capsules

1223+ bought in the past month

$29.95

About this item

  • 2 grams of Magnesium L-Threonate for cognitive support*
  • A patented form of magnesium that readily crosses the blood-brain barrier for utilization in the brain*
  • Take 3 capsules daily. Best when taken in divided doses (take 1 capsule in the morning and take 2 capsules two hours before sleep).
  • Supports brain health and may facilitate learning and memory, as well as a relaxed mood*
  • Made and quality tested in the USA with globally sourced ingredients*
$29.95

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Product details

BrandNOW Foods
Item FormCapsule
Primary Supplement TypeMagnesium
Unit Count90 Count
FlavorUnflavored

Technical specifications

is_discontinued_by_manufacturerNo
product_dimensions2.5 x 2.5 x 4.44 inches; 0.02 ounces
item_model_number2390
date_first_availableApril 2, 2014
manufacturerNOW Sports - Nutrition and Wellness
best_sellers_rank#2,104 in Health & Household ( See Top 100 in Health & Household ) #33 in Blended Vitamin & Mineral Supplements #399 in Sales & Deals

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Customer reviews

4.66,976 ratings
★★★★★

Key to good, natural sleep

Johanna WSeptember 27, 2025

Long-time standard for ensuring that I can actually sleep - no small thing! I take 3 or 4 an hour before bedtime (per Dr's suggestion) and before long actually feel relaxed and sleepy. This just does not happen for me without Magtein. Magtein facilitates natural feeling and restorative sleep cycle for me. I feel awake and refreshed in the morning -not sickish as I did when I tried Valerian. Worth the price, from a respected brand. I am sticking with Magtein! Read more

★★★★★

Powerful

James V. from Fairfax, VANovember 10, 2025

The first time I tried it, I saw a bright circle that expanded and contracted with my heartbeat. I thought I may even fall to the ground. Whatever it was, the impact was almost instantaneous. Since then, I've taken 3 pills everyday, 1 in the morning and 2 in the evening. It feels as if the content is truly getting to my brain. I am focusing better. Able to recall numbers (such as the lock combination) better. Sleeping longer intervals. It used to be every 2 to 4 hours that I awoke. Now I am sleeping through 4 to 5 hours. Waking up only once during the night (and not twice). I've difficulty swallowing the whole pill. I open the capsule by holding the smaller of the two halves on the bottom, then dump the powder onto the center of my tongue. It gets easier with practice. I don't taste anything, unless I spill some onto other parts of the tongue. Then I wash it down with water or coffee. Even works for two pills at a time. Read more

★★★★★

⭐️⭐️⭐️⭐️⭐️ Excellent Magnesium for Brain Health

YesmirOctober 4, 2025

I’m 42 years old and have hypothyroidism, which often leaves me dealing with fatigue, brain fog, and memory issues. I decided to try Magtein (Magnesium L-Threonate) because of its reputation for supporting cognitive function, and I’m really glad I did. Unlike other forms of magnesium I’ve tried, this one actually seems to make a noticeable difference. Since starting it, I feel my concentration, focus, and memory are sharper, and I don’t experience the same level of mental fatigue throughout the day. I also like that it’s vegan, non-GMO, and comes in capsules that are easy to take. It has become an important part of my supplement routine, especially to support brain health and learning capacity, which can sometimes be more challenging with thyroid issues. Overall, this is a high-quality supplement that truly delivers on its claims. I would definitely recommend it to anyone who wants better focus, memory, and mental clarity. Read more

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★★★★★

Unique Magnesium Formulation

RSBBCBDecember 29, 2025

One of the few supplements I take that I can tell a significant difference in relaxation and mental focus. Great for sleep as well. Expensive, but also unique in that it crosses the blood brain barrier, which is unique for magnesium and has more efficacy for brain function. Read more

★★★★☆

Effective for cognition.

Average ShopperApril 20, 2025

NOW has a reputation for dependable quality and testing. While I by other supplements from Thorne, I frequently use NOW and have been satisfied thus far. Capsules are fairly large, but swallowable. I speculate that they could be opened, but would check with the company first. Not effective for constipation or anxiety, magnesium threonate is the only form to cross the blood brain barrier. Reliable studies have demonstrated safety and cognitive improvement. It took about 2 months for me to notice a cognitive difference. I wasn't brilliant, but I did notice that I had better recall and mental organization. I also take NOW magnesium glycinate for heart and mental health. Am pleased with both. Read more

★★★★★

Effective

Mary BartelsNovember 23, 2025

Great quality supplement. Helps you relax and sleep better. Read more

★★★★★

Surprisingly Effective for Mental Clarity and Focus

Ione BrasilJune 18, 2025

I started taking the NOW Foods Magtein Magnesium L-Threonate because I wanted to support my focus and reduce brain fog. After a couple of weeks of consistent use, I genuinely noticed clearer thinking and more mental stamina throughout the day. It also helped me sleep better at night without making me groggy in the morning, which was a huge bonus I didn’t expect. No stomach discomfort either, unlike some other magnesium supplements I’ve tried. This supplement is now part of my daily routine. I love that it’s in a veggie capsule and doesn’t contain unnecessary fillers. It feels like a high-quality product and definitely worth it if you’re looking to support cognitive health naturally. I just wish I had started using it sooner. Read more

Review image 1
★★★★★

Finally something that works!

foofoogirlDecember 15, 2025

Works when nothing else would. Have tried EVERYTHING and this has improved my sleep tremendously during menopause. Read more

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