In fact, the active ingredient in all hot peppers, capsaicin, is being used by some doctors to treat sinusitis. But forget about active ingredients, eat some spicy hot food.
Cajun food, Mexican food, Thai
food, Szechuan food, red chile, green chile, jalapeños, Tabasco, and habañeras. If it makes your scalp sweat, and your nose to run, it’s like medicine.
What about the “natural” cures for a cold? Some people take zinc lozenges to ward off a cold.