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Collagen is the main structural protein in the extracellular matrix found in the body's various connective tissues. It is the most abundant protein in mammals, making up 25% to 35% of the whole-body protein content. Collagen consists of amino acids bound together to form a triple helix known as a collagen helix. Collagen is primarily sourced from animal products, including bovine (beef), porcine (pork), and marine (fish) sources. The collagen is extracted from the bones, skin, and connective tissues of these animals through processes like boiling, acid or alkaline treatment, and enzymatic hydrolysis. This process breaks down the collagen into smaller peptides, which are then dried to form collagen powder or other supplemental forms. Collagen is commonly used in various applications including dietary supplements, cosmetics, and food products. In supplements, it is often marketed for its purported benefits to skin health, joint health, and overall well-being. In the food industry, collagen can be found in gelatin, protein bars, and other functional foods, used for its gelling, binding, and texturizing properties.