What kind of vitamins should i take to strengthen my immune system?

Vitamin C: Vitamin C is a water soluble vitamin which helps to boost the immune system. Vitamin C is found in abundance in fruits such as oranges, blueberries & strawberries and is also available as a supplement. To maintain a strong immune system also make certain you eat a well rounded diet, avoid too much sugar and alcohol, don't smoke cigarettes & get adequate daily exercise and rest. I wish you well!