Gastrointestinal cleansing product. It?

I am suffering with gastrointestinal disorder since almost 10 years, tried many treatments in the past like allopathy,Ayurvedic,homeopathy etc but no use. I am a software engineer and my life style is also not so good. Generally I do not have free motion every day, so I am thinking my intestines are not clean and require cleanser to completely clean. For that I saw a good supplement product gastrointestinal cleansing that is 4life Fibre system plus, this product should take 10 days to clean the intestines...Can I try this. Is the supplements good for health, will there be any side effects with it???? Already I have high BP as well and cholesterol also diagnosed in recent months. Your advise would be helpful to me... please suggest..!