It’s January in Prague. The days are short, the sky is often gray, and it seems like everyone on the tram is coughing. If you feel like you are caught in an endless loop of colds, sore throats, and general winter fatigue, you are not alone. When sickness strikes, many people instinctively reach for mega-doses of Vitamin C or over-the-counter wellness boosters. While well-intentioned, this approach is often based on guesswork rather than individual biology. True immune resilie