According to a united nations university report, 62% of all drugs have been derived from the discoveries of medicinal plants.

The answer is cancer drugs. According to a united nations University Report, almost 62 percent of all discovered and distributed cancer drugs have been made or derived from the discoveries of medicinal plants.  Cancer Drugs are usually made from Medicinal Plants, because they contain more effective effects than other substances.

According to a 2005 united nations university report, 62% of all cancer drugs were derived from the discoveries of bio prospectors. In spite of their economic and medicinal potential, less than 0.5% of the world's known plant species have been observed for their medicinal properties. Bio prospectors search tropical forests and other ecosystems to find plants and animals that scientists can use to make medicinal drugs.