FATHER gave us our immune system as a defense against viruses, bacteria, and other invaders. A strong immune system is all that is needed. However, most people have compromised immune systems from various influences.
My wife and I take supplements each day to boost our immune systems. I buy NAC from Life Extension. I cannot and will not recommend anything to you since I am not a qualified healthcare provider. I do recommend that you do your own research and check with your doctor concerning supplements.
I will share more tomorrow.