From tad69's reference article..
"Creatine Liquid or Serum
You can also take creatine in liquid or serum form. In theory there are many advantages to liquid creatine over powder. It is a more effective delivery mechanism so much more creatine is absorbed. This means you can take less creatine in liquid form and still get the same results. In addition, you don't need to leave as much time between when you take your creatine and when you can start working out.
The major down side to liquid creatine is it is very hard to make. If creatine is just mixed in a liquid it starts to breakdown into a waste product (creatinine) after about 20 minutes. So, to make liquid creatine effective the creatine must be stabilized. If the creatine is stabilized it will not break down into a waste product - and it will remain as creatine monohydrate.
Time for another quick personal note. In an earlier article I mentioned a few of us have been trying the creatine serum with very good results. I don't want to plug products here - but I figured I would share since it has worked for us. We are using MMUSA's Xtra Advantage Creatine. We researched and bought it at PowerSupplements.Com. They had some good info on all the benefits of the serum and very nice customer service. I should state they have bought ads on our site - but this really is not the reason I mention them. Just want to pass along our personal experience.
Personal Note Number 2: On 5/1/02 the friendly folks at PowerSupplements convinced us to try a new creatine serum from Germany - DiMaxx Muscle Creatine Plus. We have been using it since 5/1/02 and we are very impressed. We have had all had great results and most of us have now converted from the Xtra Advantage. A little bonus for you vegetarians and vegans - the DiMaxx is the only creatine on the market that is derived from plants! "