Research shows that Echinacea increases the number of white blood cells. White blood cells fight infections and are a key component of the immune system. Echinacea is anti viral, anti-inflammatory, antioxidant and antimicrobial, all very important for optimal immune function.
Echinacea intake induces an immune response through altered expression of leucocyte hsp70, increased white cell counts and improved erythrocyte antioxidant defences. - ncbi.nlm.nih.gov/pubmed/15985050