Pure NAC N-Acetyl L-Cysteine Powder made from a single ingredient, providing a pure undiluted supplement derived from the amino acid L-Cysteine. Cysteine occurs naturally in bananas, spinach, and fish. Pure — no additives or fillers. Our dietary supplements are free from rice flour, magnesium stearate, or other bulk agents. Packaged in Utah, USA. Lab verified and always pure.