I make my own: 3 grapefruits and a lemon’s worth of peals. Cover with water and simmer for two hours totally covered. Let it cool completely, strain and sip for a few days when needed. Works for me, but maybe not for everyone. Bitter.
A throwback on quinine would have to go as far back as the 1600s, according to Thiruvananthapuram-based Emeritus Professor of Neurology Dr K Rajasekharan Nair. “There was a time in history when quinine was a panacea for all ailments,” he says. Extracted from the bark of the cinchona tree, it became the most wanted drug in the world to treat malaria which was killing people. “Malaria did not have a medicine until 1635, when quinine, an alkaloid obtained from the bark of a cinchona tree, was found to be effective,” explains Dr Nair, who is also a medical historian.
Source: Why is quinine being discussed in COVID-19 times? – The Hindu