I've never heard of anavar being hard on the kidneys but it will affect the liver since it is a 17aa steroid. Just dont stay on it for an extended period of time, 4-6 weeks should be safe.
The main people who have troubles with higher protein are patients with kidney problems already which in that case lowered protein is one of the treatments.
Steroids have to be filtered in the blood so some kidney stress is going to occur but for the most part nothing to worry about unless using higher doses of more toxic orals for long periods of time.
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