I don't know about Bettermms as it's a new one added to the recommended suppliers but it looks ok. I got mine from PGL international.
People will tell you to take all sorts and you just have to find out yourself if they are right, which can take a lot of time.
I think if you take too much supplements they can put an extra burden on your digestion and so on so you need to find out if you really need them.
There is a herbal laxative called triphala which is also a bowel tonic and strenghtens digestion
It can be taken as powder or pills but powder is better .
Tastes horrid but better than colonics or enemas