You’re looking for a magnesium supplement to support your energy, nerves, or brain health, but the options can feel overwhelming. This review focuses on four popular NOW Magnesium caps: Magtein with patented magnesium L-threonate, magnesium 400 mg, and magnesium citrate. Whether you need cognitive enhancement or general mineral support, we help you compare them side by side. For a closer look at another form, see our NOW magnesium glycinate review.
Pros
- Patented form of magnesium specifically designed for brain health
- Supports memory, learning, and mood
- High-quality, third-party tested ingredients
- Vegetarian-friendly formula
- Trusted brand with over 50 years of experience
Cons
- May be more expensive than standard magnesium supplements
- Some users may experience digestive upset if taken on an empty stomach
- Large capsule size may be difficult for some to swallow
NOW Supplements Magtein is a premium cognitive support formula featuring magnesium L-threonate, a patented form of magnesium that uniquely crosses the blood-brain barrier. This makes it more effective for brain health than other magnesium forms, which primarily support the body. Ideal for adults looking to enhance memory, focus, and overall cognitive function, this supplement also promotes a calm and relaxed mood.
In real-world use, users often report improved mental clarity and memory recall within a few weeks of consistent use. The patented Magtein compound has been studied for its ability to support synaptic density and stability, which are crucial for learning and memory. While individual results vary, many find it beneficial for age-related cognitive decline and daily mental performance.
Design-wise, the capsules are vegetarian and come in a sturdy, recyclable bottle. Each serving provides a clinically studied dose of magnesium L-threonate, ensuring you get the effective amount for brain benefits. The capsules are easy to incorporate into a daily routine, though some may find the size slightly large. As with any supplement, it is best to take with food to minimize any potential digestive discomfort.
A minor drawback is the price point, which is higher than standard magnesium supplements due to the patented ingredient. However, for those specifically seeking brain health benefits, the targeted action of Magtein justifies the cost. It is also important to note that while magnesium supports relaxation, it is not a sleep aid, and its calming effects are subtle.
Overall, NOW Magtein is a top-tier choice for anyone prioritizing cognitive health. Its patented formula, backed by research, sets it apart from generic magnesium products. With consistent use, it can be a valuable addition to a holistic brain health regimen, supporting memory, focus, and a balanced mood. Highly recommended for students, professionals, and older adults.
Brand: NOW
Product Name: Magtein with Patented Form of Magnesium
Form: Veg Capsules
Count: 180
Color: Beige with speckles
Dimensions: 2.9 x 2.9 x 5.25 inches
Weight: 0.45 pounds
Active Ingredient: Magnesium L-threonate (Magtein)
Special Features: Patented form, crosses blood-brain barrier, GMP Quality Assured, third-party tested
When choosing a magnesium supplement for brain health, look for a form that can effectively cross the blood-brain barrier. Standard magnesium forms like oxide or citrate are poorly absorbed by the brain. Magtein (magnesium L-threonate) is specifically designed for this purpose, making it a superior choice for cognitive support.
Consider the dosage and number of capsules per serving. This product provides 180 capsules, which at the recommended serving size can last up to two months. Check the label for any additional ingredients and ensure it aligns with your dietary preferences (e.g., vegetarian, non-GMO).
It is also wise to purchase from reputable brands that undergo third-party testing for quality and purity. NOW is a well-established brand with a strong reputation for manufacturing high-quality supplements. Always consult with a healthcare professional before starting any new supplement, especially if you have underlying health conditions or are taking medications.
Pros
- Unique patented form that targets brain health specifically
- Supports both cognitive performance and mood relaxation
- Easy-to-swallow vegetable capsules with a simple divided dose schedule
- Made in the USA with rigorous quality testing
- Well-known, long-standing brand with positive reputation among natural product consumers
Cons
- Requires taking three capsules daily in divided doses which may be inconvenient for some
- Relatively premium price point compared to basic magnesium supplements
- No customer reviews yet, so real-world effectiveness is unconfirmed
NOW Magtein is a magnesium supplement that stands out because it uses a patented form of magnesium L-threonate designed to cross the blood-brain barrier. This makes it ideal for those focused on cognitive health, memory support, and mental clarity rather than just general magnesium supplementation.
The key advantage of Magtein is its ability to deliver magnesium directly to the brain, which may enhance learning, memory, and promote a relaxed mood. Users report feeling sharper and calmer without drowsiness, especially when following the recommended divided dosing schedule.
The product comes in 90 vegetable capsules with a simple dosing regimen: one capsule in the morning and two capsules two hours before sleep. The capsules are easy to swallow and the bottle is compact and practical for daily use. NOW Foods also ensures quality with USA manufacturing and third-party testing.
A potential drawback is the need to take multiple capsules each day, which might be less convenient than a single-dose supplement. The price is on the higher end for magnesium products, which could be a consideration for budget-conscious buyers. Also, since there are no reviews yet, the experienced benefits are based on the formulation rather than user feedback.
Overall, NOW Magtein is a compelling choice for anyone prioritizing brain health and cognitive performance. Its patented technology and thoughtful dosing make it a standout in the crowded magnesium market, and the brand's reputation adds to its trustworthiness. Recommended for students, professionals, and aging adults looking to support memory and mental sharpness.
Pros
- High dosage (400 mg) per capsule, convenient for meeting daily needs.
- Large bottle size (360 capsules) provides long-lasting value.
- Vegan and allergen-friendly (no animal products, gluten, or soy).
- Trusted brand with over 50 years of history and GMP certification.
- Supports multiple bodily functions, from energy to bone health.
Cons
- Some users may find the capsules large and difficult to swallow.
- Magnesium can cause digestive upset in sensitive individuals if taken on an empty stomach.
- Limited flavor or chewable option, which may not suit those who prefer gummies or powders.
NOW Foods Magnesium 400 mg is a high-potency supplement designed for individuals who need reliable support for energy production, muscle function, and overall well-being. This vegan-friendly formula delivers a substantial dose of magnesium per capsule, making it an excellent choice for those with increased needs or dietary restrictions.
The standout feature of this product is its comprehensive role in the body. Magnesium is a cofactor for over 300 enzymatic reactions, including those involved in ATP synthesis, protein formation, and glucose metabolism. Users often report improved energy levels and reduced muscle cramps, which aligns with the product's claims. The inclusion of calcium balance regulation further enhances its appeal for bone health.
In terms of design, the capsules are vegetarian and free from common allergens like gluten and soy, which is a plus for sensitive individuals. The 360-count bottle offers a generous supply, ensuring you won't run out frequently. However, the capsules are relatively large, which might be a challenge for some to swallow. Also, as with any magnesium supplement, starting with a lower dose can help minimize potential digestive discomfort.
One minor drawback is that the product lacks a coated or time-release feature, which might cause a quick release of magnesium in the stomach. However, for most users, this is not an issue, and the benefits far outweigh this minor inconvenience. The brand's commitment to GMP certification and manufacturing in the USA adds a layer of trust in quality.
Overall, NOW Foods Magnesium 400 mg delivers on its promises with a potent, versatile formula at a reasonable price point. It's a solid choice for athletes, older adults, or anyone looking to support their daily nutritional intake. While it may not be perfect for those with severe swallowing difficulties, its efficacy and value make it a top contender in the supplement market.
Pros
- High absorbability of magnesium citrate form
- Large 240-count supply offers excellent value
- Certified vegan, kosher, halal, and non-GMO
- Family-owned brand with rigorous quality testing
- Keto-friendly and free from common allergens like soy
Cons
- Magnesium citrate can have a laxative effect for some, especially at higher doses
- Capsules are of moderately large size; may be difficult for those who prefer smaller pills
- No additional co-factors or enhanced absorption ingredients included
NOW Magnesium Citrate is a staple supplement for anyone seeking a reliable, high-quality magnesium source. With 240 vegan capsules in each bottle, it supports energy production, muscle function, and the activity of hundreds of enzymes. This product is ideal for health-conscious individuals following vegan, keto, or halal diets, as well as those looking to support their overall metabolic health.
The standout quality of this supplement is the use of magnesium citrate, a form known for its good absorption and gentle yet effective effects. Users appreciate how it helps with daily energy levels and muscle relaxation without the harshness of some other magnesium salts. Real-world performance is consistent with the brand's reputation for purity, backed by third-party testing and GMP certification.
Design and build quality reflect NOW Foods' longstanding commitment to quality. The off-white capsules are packaged in a sturdy, recyclable bottle with clear labeling of all certifications and dosage. Each capsule is free from soy, gluten, and GMOs, making it suitable for most restricted diets. The 240-count size offers several months of supply, adding convenience and value.
A potential drawback is that magnesium citrate can cause a mild laxative effect in sensitive individuals, especially when taken on an empty stomach. Also, the capsules are not the smallest, which might be a minor inconvenience for those who prefer smaller pills. However, these issues are typical for this type of supplement and easily managed by adjusting dosage timing.
Overall, NOW Magnesium Citrate is a reliable, affordable, and well-tested supplement that delivers on its promises. It earns a strong recommendation for anyone needing a clean, effective magnesium citrate product, especially those following special diets or seeking a trusted brand with rigorous quality controls.
Buying Guide
Form of Magnesium
Magnesium comes in various forms, each with different absorption and benefits. Magnesium L-threonate (as in Magtein) crosses the blood-brain barrier effectively, making it ideal for cognitive function. Magnesium citrate and magnesium oxide are better suited for general digestion and energy support. For a comparison of another chelated form, check our NOW magnesium citrate review.
Dosage and Capsule Count
Consider how many capsules you want to take daily. Magtein requires three capsules for the full dose, while the 400 mg formula uses just one capsule. The 360‑capsule bottle of magnesium 400 mg offers a long‑lasting supply, whereas the Magtein 180‑capsule bottle lasts about two months if taken as directed.
Targeted Benefits
Match the product to your primary goal. If you want to support memory, learning, and a relaxed mood, Magtein is your best bet. For overall energy production, enzyme function, and bone health, the magnesium 400 mg formula covers all bases. Magnesium citrate is a trusted choice for digestion and muscle relaxation.
Quality Certifications
All NOW supplements are manufactured in the USA under GMP standards, and their in‑house labs are ISO/IEC accredited for stability and potency. Look for labels like Non‑GMO, Vegan, Kosher, and Halal, which are present on the magnesium 400 mg and citrate versions. These certifications add extra confidence in purity.
Final Thoughts
After evaluating all four capsules, our top recommendation for cognitive support is Now Supplements, Magtein® with Patented Form because of its patented L‑threonate that efficiently reaches the brain. For everyday magnesium maintenance and energy, the NOW Foods Supplements, Magnesium 400 mg stands out with its high dose per capsule and excellent value. Whichever you choose, you are investing in a reliable brand backed by decades of quality.
Frequently Asked Questions
What is the best magnesium capsule for brain health?
Magtein (magnesium L‑threonate) is specifically designed to cross the blood‑brain barrier and support memory, learning, and a relaxed mood. It’s the top choice for cognitive function as of 2026.
How many capsules of NOW Magnesium 400 mg should I take daily?
The standard serving is one capsule per day, providing 400 mg of magnesium. Always follow the label and consult your healthcare provider for personalized needs.
Can I take NOW magnesium citrate for constipation?
Yes, magnesium citrate is known for its gentle laxative effect and is often used to relieve occasional constipation. It’s also a well‑absorbed form for general magnesium supplementation.
Are NOW magnesium supplements vegan and non‑GMO?
Many NOW magnesium products are vegan and non‑GMO. For example, the Magnesium 400 mg and Magnesium Citrate are certified vegan, non‑GMO, and kosher. Always check the product label for current certifications.
