Be careful with this though? Quinine prolongs the amount of time it takes the heart to repolarize (the QT interval) if you take meds that do the same thing (amiodatone, prozac, many others) you can get yourself into trouble! Happened to my dad, when my mom was putting quinine in his nutrition shakes- she ordered it off Amazon and never gave a second thought to the fact that it might interact with his amiodarone 😐