I tried that (late wife’s supply) and all it did was extend my time in the bathroom.
If you took oral magnesium supplements as reccomended on Keto, that’s most likely what caused the extended bathroom experience. I can relate. I went off keto for a time so I could consume a variety of yellow veggies which I craved, but I continued the magnesium supplements. Guess what? Problem still existed. When I stopped the magnesium, my powels protested with severe pain...they had become dependant upon the magnesium...which is often used as a bowel stimulant. Had to gradually reduce it. Magnesium can be absorbed through the skin (epsom salts) without the associated bowel issues. Epsomsalts make a good foot soak or soothing bath.
Hope that helps in case you decide to go back on keto before you regain your weight.