difference between nac and nac supplements? N Acetyl Cysteine (NAC) 500mg (Doctor Alex Supplements) Can peptides help resolve chronic gut issues? Quite possibly! In my clinical practice, I've seen profound results by adding these three peptides: BPC 157, KPV, and glutathione. Why peptides? These peptides help Endoplasmic reticulum stress in gut inflammation: Implications for ulcerative colitis and Crohn's disease Replenishment of Glutathione Levels Improves Mucosal Function in Experimental Acute Colitis Laboratory Investigation