Thank you for your query at AskTheDoctor.com
I understand your concern.
Such benign cysts ( since you mentioned it does not need to be removed ) can be present and does not need any intervention. Mostly they are incidental findings during an ultrasound/ CT.
Provided your RFT is fine and there are no complaints with your kidneys, you can take protein as well as creatine supplementation, but make sure you drink adequate water ( 3-4 liters daily ) to ensure you do not end up developing kidney stones.
Hope this was helpful,
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