Other than my multivitamins, what vitamins can i take to boost my immune system?

Vit C, D & herbs &..: A good multivitamin supplies all the vits. You need but extra c can be useful- 1-2, 000 mg 2x/day. In fall & winter take 5, 000iu of vit d3- year-round if you don't get much mid-day sun. Many herbs boost immune function, like ashwagandha, andrographis & echinacea. Medicinal mushrooms like reishi & coriolus vers. Also boost immunity.A healthy diet, adequate rest & stress reduction are also beneficial.