Magnesium L-Threonate Dosage Guide: How Much Should You Take?
The right Magnesium L-Threonate dose depends on your experience level, body weight, and what you're optimizing for. Clinical trials have used doses ranging from 1000mg to 2000mg, with the standard effective range sitting at 1500–2000mg.
Magnesium L-Threonate is classified as a mineral. It is also known as Magtein, Mg-L-Threonate, MgT. Common goals include sleep, memory, anxiety, neuroprotection, cognitive longevity.
Magnesium L-Threonate Dosage by Weight
Magnesium L-Threonate is not typically dosed by body weight in the clinical literature. The effective dose range is consistent across body weights: 1500–2000mg for standard use. The calculator above provides personalized ranges based on your experience level and supplement form instead.
How to Take Magnesium L-Threonate
Timing: Split into 2 doses: take 2/3 of the dose in the evening (1–2 hours before bed) and 1/3 in the morning. Evening dosing leverages the sleep-promoting and cortisol-lowering effects. Clinical protocol: 666mg morning + 1,333mg evening (for 2g/day total).
Food: Magnesium L-Threonate can be taken with or without food — absorption is not significantly affected.
Magnesium L-Threonate Cycling Protocol
No cycling required. Magnesium L-Threonate can be taken daily long-term. Benefits are cumulative — synaptic density improvements in animal studies required 4+ weeks of consistent supplementation.
Magnesium L-Threonate Supplement Forms
Magtein® (patented Mg-L-Threonate)Recommended
Magtein is the branded, patented form used in all clinical trials. Dosage is measured in mg of the magnesium L-threonate compound (not elemental magnesium — 2,000mg Magtein contains ~144mg elemental magnesium). Always check what the label dose refers to.
Generic Magnesium L-Threonate
Generic Mg-L-Threonate uses the same compound. Effective at the same dose as Magtein when the compound purity is equivalent. Check for third-party testing. Use the same dosage.
Magnesium L-Threonate Safety & Side Effects
The maximum recommended dose of Magnesium L-Threonate is 2000mg per day.
Clinical trials use 2,000mg/day of Magtein, which provides ~144mg elemental magnesium — well within the safe tolerable upper intake of 350mg elemental magnesium from supplements. GI effects (loose stools) can occur with high doses but are less common with the threonate form than other magnesium forms.
Magnesium L-Threonate FAQ
How much Magnesium L-Threonate should I take?
The standard dose of Magnesium L-Threonate is 1500–2000mg per day. Beginners should start with 1000–1500mg. Use the calculator above for a personalized dose based on your weight, goals, and supplement form.
What is Magnesium L-Threonate used for?
Magnesium L-Threonate is a mineral primarily used for sleep, memory, anxiety. Magnesium L-Threonate is uniquely able to cross the blood-brain barrier and elevate cerebrospinal fluid magnesium levels — something other magnesium forms cannot do effectively.
Should I cycle Magnesium L-Threonate?
No cycling required. Magnesium L-Threonate can be taken daily long-term. Benefits are cumulative — synaptic density improvements in animal studies required 4+ weeks of consistent supplementation.