Member's Mark ClearLAX Polyethylene Glycol 3350 Powder for Solution, Osmotic Laxative, gets your sluggish digestive system moving again by relieving occasional constipation (irregularity). Polyethylene Glycol 3350 is the Number 1 doctor recommended laxative active ingredient (of U.S. physicians surveyed by an independent market research firm, excluding therapeutic fiber and stool softeners). Member's Mark ClearLAX Polyethylene Glycol 3350 Powder for Solution is an osmotic laxative, helping your body to hold water in the stool. This laxative increases the number of bowel movements, generally producing a bowel movement in 1 to 3 days. It's a laxative with none of what you don't need: Free of: grit, sugar and gluten.