Dr. Mercola Magnesium L-Threonate, Magnesium Advanced Supplement with Magtein, 2000 mg per Serving, High Bioavailability for Cognitive Support, Memory & Brain Health, Non-GMO, Gluten Free, 90 Capsule

Customers find this magnesium supplement to be of great quality, with one noting it's the best they've tried. The product helps with sleep, making customers able to sleep all night, and provides relief from muscle cramps, particularly leg cramps at night. Customers report it improves brain function and is better than magnesium oxide, while being gentle on the digestive system without causing stomach issues. Customers consider it an important addition to their health regimen, though opinions on value for money are mixed, with some finding it good for the price while others consider it pricey.