Does magnesium glycinate make you poop?
Nope, at normal doses. Glycinate isn't a laxative form of magnesium. Like any magnesium, though, take enough of it and your gut will notice. Pick your dose:
NOPE, not usually.
Well under NIH's 350 mg daily limit. Most people taking glycinate at this kind of dose don't take it for their bowels.
How much magnesium is in one dose
Daily limit from supplements: 350 mg (NIH)
The black line is the 350 mg daily supplement limit. Check the Supplement Facts for elemental magnesium: a capsule's total weight includes the glycine it's bound to.
Did magnesium glycinate make you go?
The meter says what should happen. Your bowels get a vote too.
Why it works
Not one of the laxative forms
NIH lists carbonate, chloride, gluconate and oxide as the forms most often reported to cause diarrhea. Glycinate isn't on that list.
The limit still applies
NIH's 350 mg daily limit covers magnesium from all supplements and medicines. Go well over it and diarrhea is the usual first sign.
The label number can mislead
Glycinate is magnesium bound to glycine, so most of a capsule's weight isn't magnesium. The Supplement Facts panel shows the magnesium itself.
Sources: NIH Office of Dietary Supplements, Magnesium fact sheet.