Assured Original Milk of Magnesia is gentle and stimulant-free so it works more like nature intended. Some other overnight laxatives containing stimulants can cause abdominal discomfort and cramps. Stimulant-free Assured Milk of Magnesia is different. It encourages your body to take its natural course and relieves constipation comfortably. This milk of magnesia can as well be used as a base for makeup.