Natural products are chemical compounds or substances produced by a living organism—that is, found in nature.[1]

  1. ^ Webster's Revised Unabridged Dictionary (1913). "Natural product". Free Online Dictionary and C. & G. Merriam Co. A chemical substance produced by a living organism; - a term used commonly in reference to chemical substances found in nature that have distinctive pharmacological effects. Such a substance is considered a natural product even if it can be prepared by total synthesis.