Detox is a perfectly valid method to avoid life long, chronic disease. Its not something you just do for a week or two by taking a product. Its a long term method and it involves supporting your bodies own detoxification pathways and sometimes they DO get overwhelmed and need nutritional support.
Most detoxification protocols start with getting your bowel moving and keeping it moving. If your backed up then your not detoxifying anything. You also need high levels of nutrition. Various vitamins and minerals are vital to detoxification and if your diet is lacking your detoxification pathways will backup.
Fresh food diet is best and cut the processed crap which is hard to digest. See,
http://www.westonaprice.org/ for a whole HEAP of information on diet and health. Its a traditionalist organisation that I was a member of.
There's a whole heap of foods I consume to help me detox and a handful of suppliments. Food wise see the link but generaly eat fresh food and don't be afraid of animal fats. Animal fats are nutrient dense foods that contain many nutrients.
Supplement wise I find magnesium to be important to detoxification and general health. Milk thistle is a good supplement to help the liver detox and if you want a serious supplement to detox then find yourself some Chlorella. Chlorella is like Spirulina if you have heard of that. They are micro algee and Chlorella in paticular is a powerful heavy metal detoxifying agent.
Regards, Anthony