In Stock
Source Naturals

Magtein®, Magnesium L-Threonate, 180 Capsules

4.8 · 5792 reviews
6,392 ₽

For Learning and Memory 667 mg Dietary Supplement Magnesium (Mg) plays an essential role in supporting cognitive function and brain health. Preliminary research suggests that Magtein® (magnesium L-threonate) may provide more magnesium to the brain than other forms of magnesium. In preclinical studies, Magtein® was shown to support healthy memory and learning as well as healthy brain synapse density in regions of the brain associated with memory. These preclinical findings have now been validated by a clinical study showing positive results in tests of overall cognitive ability after 12 weeks' use of magnesium threonate.

International delivery

Shipping calculated at checkout

Returns & exchanges

Within 30 days of delivery

For Learning and Memory 667 mg Dietary Supplement Magnesium (Mg) plays an essential role in supporting cognitive function and brain health. Preliminary research suggests that Magtein® (magnesium L-threonate) may provide more magnesium to the brain than other forms of magnesium. In preclinical studies, Magtein® was shown to support healthy memory and learning as well as healthy brain synapse density in regions of the brain associated with memory. These preclinical findings have now been validated by a clinical study showing positive results in tests of overall cognitive ability after 12 weeks' use of magnesium threonate.

Customer reviews

5.0
verified purchase
Best magnesium I used

This magnesium is the best one regarding brain functions, I used a lot of different magnesium but felt nothing from most of them expect for magnesium lysinate, but this one, I take only one capsule in the morning and can feel the stimulant effect as well as improvement in cognition, my sleep and body aches also improved.

1/27/2025
5.0
verified purchase
my favorite magnesium

Been using this one for brain fog and I believe it is amazing for that and also started taking it for migraines, I have had less since using but hormones and my neck causes a lot of my headache/ migraines.

4/18/2026
5.0
verified purchase
The product have good quality with all age benefits as well as healthy cholesterol benefits to reduce hair fall and inflammation and heart disease

The product have good quality with all age benefits as well as healthy cholesterol benefits to reduce hair fall and inflammation and heart disease. sufficient size and ingredients.

4/15/2026
5.0
verified purchase
For supporting focus, memory, and overall mental performance, especially during periods of increased workload

I take it in courses during times of mental stress or high cognitive demand. Over time, I’ve noticed that it’s easier to concentrate, my thinking feels clearer, and my overall state is calmer and more focused. I also experience better sleep quality and improved recovery. It’s important to keep in mind that this is not a typical form of magnesium for correcting a deficiency, but rather one aimed at supporting brain function, so the effects tend to be more subtle and build up over time.

3/30/2026
5.0
verified purchase

I’m very satisfied with my order from iHerb. The product quality is excellent, exactly as described, and the packaging was secure and professional. Delivery was fast and reliable, everything arrived in perfect condition. I truly appreciate the wide selection of high-quality products and the smooth shopping experience. I will definitely continue ordering from iHerb and highly recommend it.

3/15/2026
5.0
verified purchase
source naturals, magnesium l threonate

got this to see the diffrence, i got the benefit,my stiff joint and muscle was so relax it help me get my sleep,this is a must have in the house,taste was good

3/11/2026
5.0
verified purchase
Great magnesium for brain health and better sleep

I decided to try magnesium L-threonate (Magtein) because it’s known as one of the few forms of magnesium that can effectively support brain health. After using it for a few weeks, I noticed improved mental clarity and better focus during the day. It also seems to help me relax in the evening and sleep more comfortably.

3/6/2026
5.0
verified purchase

I really notice the difference with this form of magnesium compared to others I’ve tried. Taking it in the evening helps me unwind, and my sleep feels deeper and more restorative. I also feel a bit sharper and less ‘foggy’ during the day. Gentle on the stomach and easy to take.

11/25/2025
5.0
verified purchase
best calming magnesium

This form of magnesium really makes a difference with anxiety and nerves. Unlike some other supplements, this is one where i can notice the difference mentally. it's not sudden or dramatic, but taken over a few days i'll notice a general calmness and things being a bit easier. could be particularly useful for anyone suffering from the mental symptoms of pms or perimenopause / menopause or any times of stress. it's even useful for hangovers or comedowns. Magtein is expensive but in my experience it's worth having around for crisis or stress. I combine it with other slightly cheaper forms of magnesium (e.g. magnesium glycinate at night for sleep, magnesium threonate in the morning) so i get the full benefits of magnesium supplementation at a better price.

11/13/2025
5.0
verified purchase

I’ve been using this for a while and noticed increased energy and better recovery. My workouts feel more effective, and my sleep quality has improved. It took a few weeks to feel the difference, but now my body seems to be responding well. No side effects so far, so overall, I’m happy with it!

11/3/2025