what is n acetyl l cysteine

{"cid":"91222689","title":"Boost Your Well-Being NAC N Acetyl Cysteine Supplements for Natural Health and Beauty Capsules DETOX","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/21\/a2\/4c05efff44518563a4a90839c76c-200x200-1.jpg","attrs":{"Price":"3USD-10USD .free shipping","Brand Name":"YOULEVHONG","Model Number":"NAC N Acetyl Cysteine Supplements","Minimum Order Quantity":"10 PCS","Delivery Time":"5-8DAYS","Certification":"FDA NSF BRC GOED Muslim SGS ISO","Place of Origin":"CHINA,USA","Payment Terms":"T\/T, Western Union, MoneyGram","Supply Ability":"5000pcs\/day","Packaging Details":"200pcs","Primary Ingredient":"Vitamin B NAC n acetyl cysteine","Duration":"Long-lasting","Potency":"300 Mg","Allergen Information":"Contains No Major Allergens","Manufactured By":"ABC Company","Boiling Point":"Not Available","Odor":"Distinctive Smell","Type":"Micronized","No Preservatives":"Yes","Enzyme Activity":"2400 GDU\/g","Specification":"99% Purity","Flavors":"None","Recommended Use":"Take 1 Capsule Daily With Food","Dosage":"500 Mg"}}