Creatine is only manufactured by i beleive 2 or 3 different companies. Then the distributing companies by from them. Anyone correct me if I am wrong..but i have heard this from many viable sources.

Anyways..I tend to stick to major name brands such as Prolab EAS companies like that.

Stay clear from stuff like creatine carbo things that have additives in them, such as dextrose. You can by dextrose for like $1.50 for a large package and add it in yourself. The major reason I stay clear of Creatine mixes is that you don't know if you are getting the right amount of creatine in them. If you are trying to take a certain amount of grams, when you take a scoop of this so called creatine carbo..who is to say you have more dextrose in the scoop and not enough creatine and on the next scoop you could have too much creatine and waste it.

If you stick to straight creatine you can take exact measurements and add what ever afterwards.

hope that answered you question