Vince, what are they if you don't mind me asking? My GFR was 69. I'm 36 and a little concerned at that number.
Creatine and protein supplements, exercising, higher body mass index, dehydration, medication side effects and high blood pressure can increase creatinine and decrease creatinine clearance.
Only dehydration, medication side effects and high blood pressure should be of concerned.
There is an animal study that showed that testosterone can also increase creatinine but I have not seen human data on the subject.
Can Testosterone Replacement Affect Kidneys?