Magnesium chloride that is not in a long acting formulation, may be laxative. But it is a form that is readily absorbed. Notice that the product has only 62mg of elemental mag in it. That is not very much, so it might be ok for you. Start one a day or at 2 a day in divided doses with this.

I use the long acting versions of this, and it can still loosen me up.

Many people use magnesium citrate. It also can loosen you up.
Magnesium in citrate form, is used to clean out the bowel in large doses= Citrate of Magnesia -- found in most drug stores.

I get most of my magnesium from foods. 3oz of almonds have 270mg, beans, Edamame beans, yogurt, oatmeal are also fair sources.

Start slowly at one a day, to see how you react. And understand that labels do not always give elemental values. It is the elemental value you use to derive the 200mg/day dose, not the combined weight of the total product.