Magnesium Glycinate: what to pair and what to space apart

Magnesium glycinate pairs well with Vitamin D3 (magnesium is a cofactor for D3 activation), Vitamin K2 (bone-mineralisation triad), zinc (the classic evening ZMA stack), L-theanine and glycine (sleep stack), and B-complex (energy and nerve support). Magnesium antagonises calcium at the same dose (space by 2 hours), and binds tetracycline, quinolone antibiotics, and bisphosphonates, space these by 2 hours. People on diuretics, PPIs, and proton-pump inhibitors often have lower magnesium and benefit from supplementation. Caution with severe kidney disease (the kidneys clear magnesium and impairment can cause hypermagnesemia). No significant interaction with most other medications.

The most common magnesium glycinate mistakes are mis-reading the label and underdosing (the 1,000 mg on the label is the glycinate compound, not elemental magnesium), taking it at the same time as calcium or quinolone antibiotics (which blocks both), and choosing oxide instead of glycinate (oxide is cheap but causes loose stools and absorbs poorly). Another frequent error is expecting acute sedation from a single dose; magnesium's effect on sleep architecture and anxiety builds over 1 to 4 weeks of consistent use. Finally, people with severe constipation sometimes switch from citrate to glycinate and lose the laxative benefit, glycinate is the wrong choice if you want the bowel effect.

When something has to be spaced apart, two slots are almost always enough. Put one group with your first meal and the other with your evening meal, roughly 8 to 12 hours apart, which comfortably clears the 2-hour intervals absorption conflicts require. Magnesium Glycinate goes in the evening slot, and anything it competes with goes in the other. Trying to run three or four slots is where routines break down, most people can hold two.

Absorption conflicts are dose-dependent, not absolute. Trace amounts in food, a splash of milk in coffee or the calcium in a slice of bread, are not the same as a 500mg supplement, and are not worth restructuring your day around. The interactions worth respecting are between two supplements at supplemental doses taken in the same swallow. If you are only taking Magnesium Glycinate and nothing else, spacing is a non-issue, keep it in a fixed slot and move on.

• Magnesium Glycinate and Calcium
• Magnesium Glycinate and Melatonin
• Magnesium Glycinate and Vitamin D3
• Magnesium Glycinate and Iron
• Magnesium Glycinate and Magnolia Bark
• Magnesium Glycinate and Potassium

• Calcium at the same exact moment (space 2 hours)
• Tetracycline or quinolone antibiotics (space 2 hours)

• Magnesium glycinate with calcium?+

  Space them by 2 hours. Calcium and magnesium compete for the same divalent transporter and reduce each other's absorption at the same dose. The popular '2:1 calcium-to-magnesium ratio' is a daily-total ratio, not a single-dose pairing. Take calcium with breakfast and dinner, magnesium glycinate in the evening 2 hours away from the dinner calcium.
• Can I take Magnesium Glycinate in the same handful as everything else?+

  Not quite. Magnesium Glycinate has documented conflicts with Calcium at the same exact moment (space 2 hours) and Tetracycline or quinolone antibiotics (space 2 hours), which is what the spacing table above is for. Everything else can go in the same slot.
• Is spacing measured from swallowing or from digestion?+

  From swallowing. The intervals in the table are conventional practical margins that allow the first dose to clear the absorption window in the upper small intestine before the second arrives. There is no need to be precise to the minute, being roughly two hours apart is the point.

• Boyle NB, et al. Nutrients. 2017