If he wants to know if his kidneys are being damaged, he needs to take a blood test and specifically look at his Creatinine and BUN. If he is really worried, he should contact a nephrologist (kidney doctor) for advice.
I would definitely use the Igf. My bf went from 10% to 7.5% with one month of using 40mcg a day. There were no changes in diet or cardio. MC has the best.
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