what is n acetyl l cysteine

{"cid":"91224136","title":"Food Grade Nutrition Supplement NAC N-Acetyl L-Cysteine CAS 616-91-1 N-Acetylcysteine Powder 99% N-Acetyl-L-cysteine","imgUrl":"https:\/\/img.ismap.com\/nimg\/48\/7a\/dc87ea5a77ca05dafad9bbae17da-200x200-1.jpg","attrs":{"Price":"consultation","Brand Name":"SL","Model Number":"SL25080708","Minimum Order Quantity":"1kg","Delivery Time":"3-5days","Certification":"ISO22000\/ISO9001\/HACCP\/FDA","Place of Origin":"CHINA","Payment Terms":"T\/T,alibaba,paypal","Supply Ability":"1000kg\/month","Packaging Details":"1kg\/bag 25kg\/drum","Name":"N-Acetyl-L-Cysteine (NAC Powder)","Synonyms":"NAC, N-Acetylcysteine, N-Acetyl L-Cysteine","Particle Size":"100% through 80 mesh","Specification":"99%","Appearance":"White crystalline powder","Grade":"Food Grade","Storage":"Store in a well-closed place with constant low temperature and no direct sun light","MOQ":"1kg","Shelf Life":"24 Months"}}

{"cid":"91222689","title":"Boost Your Well-Being NAC N Acetyl Cysteine Supplements for Natural Health and Beauty Capsules DETOX","imgUrl":"https:\/\/img.ismap.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"}}