I agree with Demi on cleansing before spending a lot of money on supplements you probably won't need once your systems are working better. True health should not be expensive.
HOWEVER, during the cleansing phases, you may want to gently *support* (not supplement) your liver, kidneys, and colon as they work overtime removing all those old toxins from your system.
Supportive aids are:
Plenty of fresh, pure water,
good organic alkalizing food,
natural food-source fiber,
fresh clean air,
and possibly some liver and kidney fortifying herb teas.
The teas can be picked up for less than the cost of a fast food burger and fries and will be a nice flavor break from all that plain water, especially after dropping all those toxic sugary sodas. ;)