The genus Cordyceps consists of clublike parasites that attack insects. Cordyceps militaris is the best-known and most frequently collected bug-killing Cordyceps, but there are dozens of "entomogenous" species in North America. The victim for Cordyceps militaris is a pupa or larva (usually of a butterfly or moth). Its mycelium colonizes the living insect and mummifies it, keeping it alive just long enough to generate the biomass it needs to produce the mushroom--a "spore factory" that allows the Cordyceps to reproduce. Traditional healers in Sikkim recommend the fungus/mushroom Cordyceps for “all illnesses” as a tonic, because they claim that it improves energy, appetite, stamina, libido, endurance, and sleeping patterns. Evidence shows that the active principles of C. militaris are beneficial to act as pro-sexual, anti-inflammatory, anti-oxidant/anti-aging, anti-tumour/anti-cancer/anti-leukemic, anti-proliferative, anti-metastatic, immunomodulatory, anti-microbial, anti-bacterial, anti-viral, anti-fungal, anti-protozoal, insecticidal, larvicidal, anti-fibrotic, steroidogenic, hypoglacaemic, hypolipidaemic, anti-angiogenetic, anti-diabetic, anti-HIV, anti-malarial, anti-fatigue, neuroprotective, liver-protective, reno-protective as well as pneumo-protective, let alone their other synergistic activities, which let it be marketable in the western countries as over-the-counter medicine.