N-Acetyl L-Cysteine NAC Powder - 100g. Why Choose Our NAC Powder?. Expiry Date: N-Acetyl L-Cysteine Powder Unit Quantity: 100 g Active Ingredients: N-Acetyl L-Cysteine (NAC) Formulation: Powder. source of N-Acetyl L-Cysteine in potent 100g powder form.