Apparently, Professor Lupin's home remedy does have some validity!
According to a recent study by the British National Health Service, theobromine, a chemical compound commonly found in chocolate is very effective cough suppressant -- and is believed to be more effective for treating coughs than codeine!
The study says that unsweetened dark chocolate has the highest concentration of theobromine -- eating just two ounces will help with that cough. Sweetened dark chocolate, though, requires six ounces.
Milk chocolate has the least amount of theobromine. You're going to have to consumer a pound -- twice daily for the cough suppressant effects.
Alyn Morice, MD, the study's leader adds a word of caution: "Eating chocolate on a daily basis may have other unwanted effects, including weight gain."
Say it ain't so.
My verdict? It's a fun fact, but I'll stick with Ricola cough drops.