I'm one of those folks that doesn't do well with straight Senna. My 1st Master-Cleanse it gave me cramps from hell and also made me nauseous if I steeped it for the recommended 10 mins so I cut back to 5 mins then again to 3 mins cause I was still getting cramped with 5 mins.
I then tried "Get Regular" Yogi brand tea and that was the magic formula for me and besides it tasted mo bettah gud ;+D. Actually it's very tasty and if it didn't have the laxative effects I would drink it as a regular tea.