Is Cordyceps good for kidneys?

Online Answer
In at least one large-scale study, cordyceps lowered creatinine levels in people with chronic kidney disease, and in others, it had the effect of protecting the kidneys from toxic drugs, complications of diabetes, and transplant rejection. It may also lower blood sugar levels.
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What Tibetans call the worm is actually not a worm but a fungus -- Cordyceps sinensis, to be precise -- that feeds on caterpillar larvae. Or, to give the fungus its more poetic name, "winter worm, summer grass," because its appearance changes from one to the other with the seasons.
The genus has a worldwide distribution and most of the approximately 600 species that have been described are from Asia (notably Nepal, China, Japan, Bhutan, Korea, Vietnam, and Thailand). Cordyceps species are particularly abundant and diverse in humid temperate and tropical forests..
Cordyceps Sinensis (Cordy), Ganoderma lucidum (Reishi) and Agaricus Blazi Murill (ABM) are fungi widely used in traditional Chinese medicine.
Cordyceps, or caterpillar fungus, one of the most sought-after and expensive ingredients in traditional Chinese medicine, has been deemed a danger to human health by China's main food and drug regulator, mainland media report.
6.6 Cultivation of C. Cordyceps is a very rare mushroom, however, and its natural variety is quite expensive..