Magnesium Form Comparator

Pick your goal. See which of the five common magnesium forms fits best. Free, no sign-up, instant results.

By Mira Halden · Based on published literature for each form, not a clinical recommendation. See methodology.

1. What's your main goal?

Select one or more. The tool ranks all five forms based on what the published research best supports for that goal.

Frequently asked questions

Which magnesium form is best for sleep?

Magnesium L-Threonate (Magtein®) has the most direct published evidence for sleep-quality improvement. Magnesium Glycinate is a strong runner-up, especially for somatic symptoms like restless legs.

Which form is best for anxiety?

For cognitive anxiety (rumination, racing thoughts): magnesium L-threonate. For somatic anxiety (muscle tension, jaw clenching): magnesium glycinate. Many people use both at different times of day.

Which form has the fewest side effects?

Glycinate, L-threonate, and taurate are all well tolerated with low GI side effects. Citrate is moderate (mild laxative). Oxide (not included in this comparator) has the highest GI side-effect rate.

Can I take more than one form?

Yes, but watch total daily elemental magnesium intake. A common stack: L-threonate at night for cognitive support, plus glycinate earlier in the day for somatic relaxation. Keep total elemental magnesium below ~400 mg/day from supplements unless your doctor advises otherwise.

Is this medical advice?

No. This is a research-summary tool. See our methodology for what we do and don't do, and consult a healthcare provider before adding supplements if you have a medical condition or take prescription medication.