Page 1 - Reviews - 21st Century, MgO-400, 90 Tablets - iHerb

Customer Ratings & Reviews

100% authenticOur products are sourced directly from brands or authorized distributors.Show more
4.7
Based on 1,463 ratings
1,156
198
74
21
14
Write a Review
What customers say
Customers appreciate the high magnesium content and affordability of this supplement, despite some finding it difficult to swallow due to its large tablet size. Many users report improved sleep quality, better digestive health, and muscle support. Some have used it successfully for specific health conditions like kidney stones and IBS-C, though results vary. The product is praised for being gentle on the digestive system and a staple in daily regimens. However, a few customers did not notice significant benefits or found the tablets gritty when chewed. Overall, it's considered a good value with effective results for many.
Review highlights
(1,451)
 
Rating

Rating

Languages
English
Languages
Show auto-translated reviews(1,198)
Show reviews with images only
Review images
English
Translated reviews
iHerb customer
Posted on Apr 21, 2022
Vietnam
33
0
0
10
Verified purchase
This is an affordable magnesium oxide product. I majorly take this before bed to help with sleep. So far it has been great.
iHerbCustomer
Posted on Dec 11, 2022
United States
81
0
0
2
Чудово!
Verified purchase
Magnesium is important for many processes in the body, has multiple benefits. It is needed for muscles and nerves to work properly, to keep blood sugar and blood pressure at the right level, and to make protein, bone, and DNA. Low levels of magnesium over time can lead to low calcium and potassium levels.
Heaven
Posted on Nov 28, 2025
Kuwait
86
0
0
2
Verified purchase
The quality of MGO is excellent Size is normal easy to swallow I take this every night and it helps me to fall asleep easily and when i wakeup i feel more relaxed
iHerb customer
Silver
Posted on Oct 13, 2025
Saudi Arabia
103
0
0
5
ممتاز!
Verified purchase
Quality is super! The ingredients are great! Size arranged! What you need! Performance is felt! the product arranged, perfectly packed, the effect is definitely there! I will order more! Just as quickly delive
CristinaTurcan
Posted on Nov 28, 2024
95
0
1
3
Nice benefits for our health!!!!
Verified purchase
I’ve been using 21st Century MgO-400 for a few weeks now, and I’m really impressed with its effectiveness. This magnesium supplement has been a great addition to my daily routine, helping me maintain healthy muscle and nerve function. I’ve noticed a reduction in muscle cramps and tension, and I feel more relaxed overall. Magnesium is also known to support sleep, and I’ve found that I’ve been sleeping more soundly since starting it. The 400 mg dosage is just the right amount for me, and the 90-tablet bottle offers great value. The tablets are easy to swallow, and I appreciate the high quality and affordability of 21st Century products. If you’re looking for a reliable magnesium supplement, I highly recommend 21st Century MgO-400!
iHerb customer
Posted on Aug 17, 2024
Korea, Republic of
13
3
0
0
Nice product!
Verified purchase
I take this every night and noticed it helps me to fall asleep more easily and when I wake up the next day I feel more relaxed. The size is standard and the packaging was good. I am thankful to have found this product as I was struggling with sleep and anxiety. There is no taste, but it's best to take this with a glass of water
iHerb customer
Posted on Mar 31, 2025
Bosnia and Herzegovina
35
0
1
6
Simple and Effective Magnesium for Daily Use
Verified purchase
This magnesium oxide suplement delivers 400 mg per tablet, designed to tackle deficiency symptoms like muscle cramps, fatigue, and sleep disturbances. The composition is straightforward and highly concentrated, with 90 tablets per package for a solid one-to-three-month supply, depending on frequency. The size of the tablets is larger, but manageable with water. There is minimal taste, and the quality is consistent. This mineral is essential for nerves, bones, and heart function. The ingredients are clean and budget-friendly, ideal for regular supplementation. Great benefit for those with dietary gaps or increased magnesium needs.
iHerb customer
Posted on Jan 21, 2025
Bosnia and Herzegovina
54
0
1
6
High-Quality Magnesium Oxide, Perfect Tablet Size, Potent Effect for Energy, Metabolism, and Nervous System Support
Verified purchase
21st Century MgO-400 is a high-quality magnesium oxide supplement that delivers 400 mg of this essential mineral in a single tablet. It’s perfect for supporting restful sleep, promoting hormonal balance, and maintaining joint and muscle health. Magnesium is a crucial mineral for energy production, nervous system function, and overall metabolism, and this product delivers it effectively. Since incorporating these tablets into my daily routine, I’ve noticed improved sleep quality, reduced joint discomfort, and a sense of calm. The compact package with 90 easy-to-swallow tablets provides excellent value and convenience. A fantastic choice for anyone looking to enhance their overall health and well-being!
iHerbCustomer
Gold
Posted on Nov 19, 2024
United States
3,627
0
0
485
MgO-400 Mineral Supplement
Verified purchase
The MgO-400 Mineral Supplement is a highly concentrated magnesium supplement, providing 400 mg of magnesium oxide per serving. Magnesium plays a crucial role in many of the body’s processes, including muscle function, bone health, energy production, and maintaining a healthy nervous system. This supplement is typically used to help with magnesium deficiency, support muscle relaxation, improve sleep, and promote overall wellness.
SalmanMudhhi
Posted on Nov 18, 2024
Saudi Arabia
1,984
0
0
259
MgO-400 Mineral Supplement
Verified purchase
The MgO-400 Mineral Supplement is a high-quality magnesium oxide supplement designed to provide essential magnesium to the body. Magnesium is a vital mineral involved in over 300 biochemical reactions in the body, including muscle function, nerve transmission, energy production, and bone health. Magnesium is known for its mild laxative effect, which can help relieve constipation by promoting regular bowel movements.