Creatinine elevates when kidney damage occurs. The normal range of creatinine level is 0.7 to 1.3 mg/dL for men and 0.6 to 1.1 mg/dL for women. Good news is that high creatinine level can be lower down naturally. If your creatinine level is 8, it is a quite high level. And you are suggested to take one or more of the following treatments as soon as possible.