I am pretty sure that there is some research into it being a first line treatment for obesity and should be used as such. I forget which organization called it.
I the hospital I regularly see people who take too much and don't get enough protein and fiber have pretty bad stomach aches. So long as you use it correctly side effects are uncommon. Also, I am 70 pounds down from buying stuff from China at like 1/10th the price and it's been chill for me.