The Vitamin Shoppe, NAC, 600 mg, 200 Capsules 108 750+ sold in 30 days $34.99 NOW Foods, NAC, 1,000 mg, 60 Tablets 14,549 1,000+ sold in 30 days $11.01 Swanson, NAC N-Acetyl Cysteine, 1,000 mg, 60 Capsules 593 1,000+ sold in 30 days ...