Pseudo-medicine, a placebo, ineffective.
Homeopathy is very expensive water. (full marks on the mid-term, any other materially different answer gets zero).
Homework: go to http://www.randi.org/site/
Report on what you find there.
What is the purpose of the organization?
Who is James Randi?
What is Avogadro's limit?
Leave your answers in the comments to this post.