L-Cysteine HCl Monohydrate FCC Kosher is a food-grade, kosher-certified hydrochloride salt of the amino acid L-cysteine in monohydrate crystalline form. It acts as an antioxidant and supports protein synthesis, enzyme production, and glutathione formation. This ingredient is widely used in food, nutraceutical, pharmaceutical, and cosmetic applications. The kosher certification ensures compliance with dietary standards for food and supplement formulations.