if you read the label on your kre-alkalyn it should say "5gs creatine monohydrate".
the active ingredients are the same, the difference is the what else is in it.
the way your body reacts to creatine is different depending on who you are.
i took creatine monohydrate and got stomach cramps and my brother took it and he was fine.
i am now taking kre-alkalyn and i have had no problems.
another difference is creatine monohydrate can be come creatinine (i dont know if that is how it is , but that is poisonous to your body (when i find the link to this info. i will post it)