Hi, I am down with sinus infection and throat pain. I went to the doctor and they gave me antibiotics. I always get sick often. Mostly will be down with strep throat and end up in antibiotics. Doctor said that, my immune system is so weak and that's the reason for frequent illness. So, they told me to take some vitamin C and zinc supplements. I am deficient in vitamin D(very low),B12 and iron(very low). I am taking the prescribed supplements for those. Along with that, I am planning to take some zinc and vitamin c. Anyone have any recommendations for the brands? What are you all taking or eating to boost up your immunity levels? What do we add in our diet to boost up the immunity system? Any input is appreciated. Thank you.