creatine is what you ingest to help your muscles transfer ATP to ATD, which is why weight lifters take creatine, to help muscles recover quickly for the next set of big weights. creatinine is the metabolite of creatine which the drug testers will be looking for if they want to check ratios to see if you're flushing with water. osmolality tests are another way to check the salt or ph balance of your urine.imp: