Concomitant use with groups of biphosphonates (alendronate, etidronate, risedronate), quinolones (ciprofloxacin, gatifloxacin, levofloxacin, lomefloxacin, moxifloxacin, norfloxacin, ofloxacin, sparfloxacin, trofafloxacin), tetracyclines (doxycycline, monocycline, tetracycline) can decrease the absorption of those 3 (three) groups.
Boron increases plasma concentration of magnesium.
Calcium, manganese, iron, Na-Alginate can decrease magnesium absorption.
Inositol hexaphosphate inhibits magnesium absorption.
Non-digestible oligosaccharide increases magnesium absorption in colon.
Phosphate decreases phosphate and magnesium absorption.
Foods with high content of oxalic acid (spinach, potatoes, rhubarb, nuts) or phytic acid (nuts) can decrease magnesium absorption.