Some of them are great and some are not so great. I believe that you must be able to find the right one for your needs to get the results that you are looking for.
The main ingredient in creatine is creatine phosphate. Creatine is the only amino acid that contains the proper amount of nitrogen. The body uses the free form of creatine phosphate to make muscle protein. The more nitrogen it has, the more muscle protein it makes. This is why creatine is a great supplement to supplement with. This is especially important if you have a problem with insulin, because insulin levels are lowered when you are training. Insulin levels are also lower in people who have muscle wasting diseases, such as sarcopenia.
Creatine phosphate can be easily made by mixing 2 tablespoons of coconut oil with 2 tablespoons of water in a medium sized saucepan over medium heat. The mixture will begin to bubble up at this point, and the color will darken. The bubbles will slowly start to form into a thick paste. Allow this to continue to heat for about 2-4 minutes until it becomes almost black in color. It will begin to thicken and turn into a solid like powder.