Cordyceps mushrooms: Cordyceps militaris

Cordyceps (Cordyceps sinensis, Sphaeria sinensis) is one of my preferred dietary supplements for a natural energy boost. 
A fungus that kills and then grows on the bodies of caterpillars in mountainous regions of China, cordyceps is also known as vegetable caterpillar and Chinese caterpillar fungus. 
It is traditionally used to combat fatigue and muscle weakness, improve mental energy, increase sexual vigor, and promote optimal aging. 
The effects on fatigue may be due to effects on the cellular production of adenosine triphosphate (ATP), the compound that stores and transfers metabolic energy.
Many other health benefits have been attributed to cordyceps, including some protection against the effects of whole-body radiation therapy on bone marrow and the intestinal tract. 
Research in the laboratory has also shown that cordyceps stimulates many different immune cells, but it isn’t known whether the same effect occurs in the human immune system. 
And evidence from studies in kidney transplant patients suggests that cordyceps can help improve their kidney function. 
Studies in mice and rats have found that cordyceps can lower blood sugar, but this has not been confirmed in humans. Still, if you’re diabetic, you might consider trying it.