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Which magnesium is best for sleep?

When it comes to improving sleep quality, Magnesium Glycinate (also known as magnesium bisglycinate) is widely considered the gold standard. This form binds magnesium to glycine, an amino acid that independently promotes relaxation and lowers body temperature, which helps signal to the brain that it is time for rest. Because it is a chelated mineral, it is highly bioavailable—meaning your body absorbs it efficiently—and it is significantly gentler on the digestive tract than other forms, making it ideal for those who want to avoid the laxative effects common with cheaper alternatives like magnesium oxide.

For those whose sleep is specifically disrupted by a racing mind or "brain fog," Magnesium L-Threonate is an increasingly popular alternative. This newer, specialized form is unique because of its superior ability to cross the blood-brain barrier, directly increasing magnesium levels within the brain. While it is often more expensive than glycinate, it is frequently used to calm overactive neural pathways and support the "off switch" needed for mental relaxation. Many people also find success with Magnesium Citrate, which is highly absorbable and cost-effective, though it is usually recommended only in lower doses for sleep due to its tendency to stimulate the bowels.

When choosing a supplement, it is best to look for products that undergo third-party testing (such as those with NSF or Informed Sport certifications) to ensure purity and label accuracy. Most experts recommend taking your magnesium roughly 30 to 60 minutes before bed to allow the calming effects on the nervous system and muscles to take hold. While 200 mg to 400 mg is a standard range for many adults, it is always wise to start with a lower dose to see how your body responds before increasing it.