L-Cysteine is widely used in the food industry as a dough conditioner in bread and baked goods. It helps reduce mixing and proofing time by weakening gluten structure, resulting in softer texture and improved volume. In pharmaceuticals, it serves as an active ingredient in mucolytic agents, helping to break down mucus in respiratory conditions like bronchitis and emphysema. It is also used in some antioxidant supplements due to its role in synthesizing glutathione, a key cellular antioxidant. In cosmetics, L-Cysteine is used in hair treatments and permanent wave solutions because it can break disulfide bonds in keratin, allowing hair to be reshaped. It is also found in skin-lightening products for its ability to inhibit melanin production. Additionally, it is used in cell culture media and biotechnological applications as a source of sulfur and reducing agent to maintain proper protein structure.