Milk of Magnesia, chemically known as magnesium hydroxide (Mg(OH)₂), is a widely recognized over-the-counter medication with a long history of use. It is primarily celebrated for its efficacy as both an antacid and a laxative, addressing common gastrointestinal discomforts. Beyond its internal applications, this versatile compound has garnered attention for a variety of external uses, ranging from skincare to personal hygiene, though many of these remain largely anecdotal or require further scientific validation. This comprehensive guide delves into the chemical properties, primary internal uses, and a detailed exploration of its lesser-known external and beauty applications. We will also meticulously examine the crucial precautions, potential side effects, and contraindications necessary for its safe and effective use, ensuring an informed understanding of this ubiquitous household remedy. Table of Contents I. Chemical Composition and Mechanism of Action II. Primary...