I'm no expert on this, but will share my own experience. I was doing a lot of fasting/bowel cleansing, but I think I did some a little too fast (or not enough colonics?) and after felt some strain on my kidneys. So, given my experience, I would start with bowel cleansing. If you're colon is not clean, the excess toxins can end up in other organs...in your friend's case, that could cause serious complications!

I'd check out the Richard Schultze link at the top of the page.

That's my experience, maybe others have better input.

KarenMarie

Diet is always the first step.

No sugar, no processed foods, no Coke, no sodas, no grains, no pork meat, no processed milk products, ...

What is his blood type?
He should strictly follow bllod type diet!
Also, Rotation-Elimination Diet !

Water: moderate amount, clean, natural mountain sprin water ONLY.
Salt: Unrefined Sea Salt ONLY, no other kind of salt should be in his diet
Therapies: Hellinger's Therapy for partents ONLY

Bowel Cleanse: Start with enema or colonics!
Dental Clenup: Wait, until kidneys are strong enough

Kidney Cleanse: All herbal teas that can give a strength to kidneys: Watermellon Seeds tea, Cellery Seeds Tea, Stinging Nettle tea, Parsley tea, Burdock Root tea, Corn Silk tea ...

Liver flush:
1 teaspoon of magnesium salt at 6 PM.
Enema at 8 PM
Olive oil + grapefruit at 10PM (1/2 cup of this mixture is enough for 10 years old)
Epsom Salt Enema at 6 AM (instead of oral dose epsom salt)
Epsom Salt Enema at 8 AM (Instead of oral dose epsom salt)

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Liver can be fluhed every 20 - 30 days.

Other therapies that I would recommend: Homeopathy, Acupressure, Acupuncture, Moxa therapy

Let us know the results!