Are there vitamins and supplements that improve the immune system?

Yes, there are vitamins and supplements that can help improve the immune system. It is important to note that a healthy and balanced diet can provide all the necessary nutrients for a strong immune system. However, in Canada and Quebec, many people suffer from a vitamin D deficiency due to the latitude. It is recommended that people over 50 take a daily vitamin D supplement according to Health Canada. The need for supplements may vary depending on factors like the season, latitude, age, and dietary intake.