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St John’s Wort has been proven to be as effective as medicinal anti-depressants in treating mild to moderate depression. Wisconsin Department of Natural Resources/Flickr

Weekly Dose: St John’s Wort, the flower that can treat depression

The flowering tops and aerial parts of the St John's Wort plant are used medicinally in the form of tinctures and tablets to treat a number of conditions affecting the nervous and immune systems.
Pills sold as ecstasy contain variable amounts of MDMA, sometimes none. AAP/Australian Federal Police.

Weekly Dose: ecstasy, the party drug that could be used to treat PTSD

Ecstasy is the street name for 3,4-methylenedioxymethamphetamine, or MDMA, an illicit party drug that speeds up messages to and from the brain and alters the user's perception of reality.
The US National Cancer Institute tested tens of thousands of plants and made this miraculous find. Het Spul/Flickr

Weekly dose: Taxol, the anticancer drug discovered in the bark of a tree

The US National Cancer Institute screened 35,000 plants, but one particular sample collected from the bark of the Pacific Yew tree provided what is now one of the most highly prescribed cancer drugs.
Lipitor is widely prescribed for cholesterol, but incorrect negative reports have seen its use decline slightly in Australia. from www.shutterstock.com.au

Weekly Dose: Lipitor, the highest-selling drug of all time

Lipitor was approved by the government in 1997, and while under patent protection it was the highest-selling drug of all time with worldwide sales of more than US$12 billion a year.

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