Magnesium citrate
"As I was reading reviews wondering when this kicks in, it happened. Took 10oz in the afternoon and again in evening for colonoscopy prep, didn't drink enough water, and only made 1 movement. Thought "30 min to 6 hours til it works? Did I do it wrong? It's been almost 12." Yes, I did. I didn't drink enough water afterwards. Drink lots of water! I woke up at 2am and didn't trust a fart. Tummy gurgling, sitting down, browsing the net, and boom. You'll pee out your butt with this, no joke. Give it time and it'll take anywhere from 30 mins to 6 hours to kick in, possibly 12 if you're me and didn't drink water after. Got it for 97 cents in cherry, grape, and lemon flavor. They all taste like super sour candy and it helps to take with Gatorade."