Article here:
http://www.dukechronicle.com/article/2015/09/duke-scientists-treat-depression-with-intestinal-worms
Short excerpt:
Eating intestinal worms may be a possible treatment for depression and other neurological diseases, according to a group of Duke scientists.
Helminthic therapy is an effort to rebalance the immune system and address a variety of disorders by putting the helminth worms back into the human body. Although the Food and Drug Administration has not currently approved helminths as a treatment method, some people have begun to treat themselves using the organisms and have reported positive effects.
I'm posting this here not because there is a vendor selling them on DNMs - although that would be awesome - but because our mod /u/-lobali has previously brought up a story about the guy who was selling them in the US and was shut down. He was able to cure his own asthma by "infecting" himself with hookworms and started a business because of that.
Links for those who want to know more:
Medicine has gone full circle.