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I take Magnesium Glycinate as a laxative but have reached 500mg per day and it's not enough. Too much already, or is it safe to take more?

For laxative purposes you should prefer the forms which are most poorly absorbed, i.e. magnesium oxide or magnesium citrate

They're also the cheapest.

Magnesium glycinate not very effective for being a laxative. Magnesium citrate is probably what you want.

Yeah, there's that drinkable laxative called citroma, which is pretty much magnesium citrate and seltzer water as far as I can tell.