NINACACA, Peru — High in the Peruvian Andes, a shaman rubs a fluffy white rabbit all over Chris Kilham’s body, murmuring in Quechua, the language of these barren plains. Then she slits the animal’s throat and lets the blood run into a tiny grave.

To Mr. Kilham, the offering — an appeal to the gods for a bountiful harvest of maca, a local tuber — is just another day at the office.

“People in the U.S. are more cranked up on pharmaceutical drugs than any other culture in the world today. I want people using safer medicine. And that means plant medicine.” - Chris Kilham, The New York Times

Photo: Lucy Herrera, left, a shaman, performing a harvest ritual with Chris Kilham, center, his wife, Zoe Helene, and others.