I do not mean steroids but those protein shakes and so on.

You sound like you know the steroid draw back, so wont bore you with those. As for protein shakes & creatine there is very litte in the way of drawbacks apart from some wind as protein & creatine are found in food sources anyway. The main drawback is probable price they are expensive and not all people get results.
Just a little bit of new information today for all those internet marketers looking for the best new up and coming release for 2010. Be on the lookout of Niche Blueprint 2 coming on January 11, it is going to be huge and change the ecommerce marketplace.

a good source for advice & protein supplements is

http://www.cheapdiscountsupplements.com/categories/Whey-Protein-Powders/