Page 1 - Reviews - Dr. Mercola, Magnesium Advanced, 90 Capsules - iHerb
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Customer Ratings & Reviews

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4.8
Based on 5,068 ratings
4,390
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English (UK)
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Grace
Posted on 7/01/2026
Ireland
9
0
0
1
Good product but pricey!
Verified Purchase
I like this and have purchased it many times but have switched to another brand which charges less - I do like the glass packaging but it probably pushes the price up as well. I realised I don't need amber glass as I store my supplements in a dark place anyway, and a supplement like this doesn't last long enough to go bad as I take 2-3 per day. I would like to see expensive products like this to be sold in more cost-effective packaging, to bring the price down.
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iHerb Customer
Posted on 16/08/2025
Ireland
1
0
0
0
Best magnesium supplement by far
Verified Purchase
Here’s a polished, balanced review of Dr. Mercola Magnesium—specifically the Magnesium Advanced (L-Threonate) formula: --- Review: Dr. Mercola Magnesium Advanced (Magnesium L-Threonate) Overview Dr. Mercola's Magnesium Advanced, featuring Magnesium L-Threonate (Magtein®), is positioned as a premium supplement engineered for enhanced brain absorption and cognitive support. A typical serving of 3 capsules provides 2,000 mg of Magtein®, equating to 145 mg elemental magnesium . This lower elemental magnesium content is intentional, emphasizing absorption efficiency over sheer quantity. What Users Are Saying Positive Highlights Improved sleep & relaxation: > “My sleep becomes very deep, and I wake up feeling fully rested and energized. It’s excellent for relaxation and sleep.” “It helps reduce my anxiety and depression… 2 pills at night help me sleep fast and deep… I feel more focus, more energetic.” Cognitive enhancement: > “Magnesium L-Threonate… effectively crosses the blood-brain barrier, enhancing memory, focus, and overall mental clarity.” Gentle on digestion: > “Very gentle on the stomach—no laxative effect at all, which is common with some other forms of magnesium.” High quality and packaging: > “Top quality… no added fillers or junk ingredients… comes in a glass bottle that preserves freshness.” “Clear label and instructions… It just works.” Amazon feedback echoes similar sentiment: > “Helps me calm down before bed, helps with leg cramps while sleeping and I just sleep more restfully.” Mixed or Negative Reports Cost and possible mild side effects: > “Expensive but quality product… work very well… good sleep no bloating… bit on expensive side.” “It made me kind of nauseous and gave me muscle spasms basically the day after taking it.” Potential for acid reflux: > “Pretty pricey and a lot of times it gives my throat problems like heartburn in my throat.” --- Pros & Cons Summary Pros Cons Supports sleep, relaxation, and cognitive clarity Pricey compared to other magnesium forms Gentle on digestion—minimal laxative effect May cause mild side effects (e.g., nausea, spasms, heartburn) in some users Formulated to cross blood–brain barrier effectively Lower elemental magnesium per serving High-quality ingredients and eco-conscious glass packaging --- Additional Considerations & Context Scientific rationale: Magnesium L-Threonate is specifically studied for its ability to elevate brain magnesium levels, which may support memory
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Ksenia
Silver
Posted on 26/11/2025
Kazakhstan
132
0
11
65
Super
Verified Purchase
This is my number one magnesium supplement for stress management and sleep support. The advanced formula really works. I feel calm within an hour of taking it, and my sleep has improved significantly. No more waking up in the middle of the night. A quality product from a brand I trust. This magnesium provides a noticeable feeling of relaxation and mental calm that I didn't have before. Clearly, the key here is the form, which is designed for good absorption and effects on the brain and muscles. The capsule size is perfect. I will be buying again.
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Bonnie
Posted on 5/08/2026
United States
39
11
0
8
It helps with sleep
Verified Purchase
Dr. Berg said that magnesium threonate helps repair brain nerves, and can also help with sleep, prevent hair loss, and aid calcium absorption, so I bought it to try. Taking one tablet an hour before bedtime helps me sleep better. It comes in a glass bottle, and the quality is good; it won't turn yellow or develop an odor after a while. I will continue to repurchase it.
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NirK
Silver
Posted on 24/11/2025
Israel
126
0
1
23
The best product on the market
Verified Purchase
Quality capsules with good absorption, especially before bed. Feels calm and sleeps deeper, without side effects in the digestive system. Easy to swallow and with natural ingredients. Excellent product that I will buy again.
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EdilsonMartin
Posted on 20/11/2025
Brazil
29
2
0
57
Excellent
Verified Purchase
Excellent magnesium supplement, with a good size and ingredients in just the right proportions. Very good quality. Benefits sleep, muscles, and joints. The best magnesium supplement I've ever taken.
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iHerb Customer
Silver
Posted on 2/11/2025
Russia
253
32
0
186
Good health to everyone, and like me ✔👍😍
Verified Purchase
Everything is very high quality! It's great for your health! The scent is neutral! The whole family can use it! I love absolutely everything about this product! It improves the condition of your skin, making it smooth and attractive. It's a completely natural, concentrated product. It's not tested on animals! It's gluten-free! You'll definitely feel the difference! I ordered this brand and I didn't regret it one bit. The quality is superb!! The ingredients are very beneficial. Health: I feel an improvement in my condition. I started gaining a little weight, which was important to me. Baby hair has appeared on my head; I usually don't have it. Age: 34 Overall, I highly recommend it!!! I 100% recommend it!
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Maria
Posted on 5/10/2025
Moldova
3
1
0
1
Produs minunat pentru liniștire
Verified Purchase
I ordered this product to calm my brain. Now I feel more relaxed and I am sure that after 3-6 months I will feel great🥰
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Elmira12
Gold
Posted on 28/07/2025
Kazakhstan
570
7
47
707
Verified Purchase
The quality of minerals and vitamins is super, the composition is chosen correctly, a food supplement, the taste is pleasant, the frequency of intake is also pleasing, cholesterol has decreased, the benefit of the drug, ideal for any age. The ingredients are natural, the size of the package is super.
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iHerbCustomer
Gold
Posted on 26/03/2026
Philippines
365
0
12
155
Essential
Verified Purchase
Aside from Bisglycinate, been researching for another kind of magnesium that i can take and this one tick the boxes. And this kind is also highly absorbable form of magnesium. It is primarily used to enhance cognitive function, improve memory, boost focus, and support sleep. By raising brain magnesium levels, it may promote synaptic density and protect against cognitive decline. And ive been hearing Dr Mercola, so this might be quality.
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