In one recent study, the herb curcumin, which is found in the spice turmeric, has been found to benefit innate immune function. In this study conducted at Oregon State University, Dr. Adrian Gombart and colleagues found that curcumin nearly tripled the expression of a gene that encodes cathelicidin antimicrobial peptide (CAMP), a compound that helps combat viruses, bacteria and fungi newly encountered by the immune system.

Curcumin has long been used in ayurvedic medicine for its health benefits. Although curcumin is not quite as potent as vitamin D for increasing CAMP, it's an effect enhancer of immune function. Along with its antioxidant and antiinflammatory properties, curcumin is increasingly being used in conventional medicine. Widely used in the treatment of liver diseases and arthritis, curcumin is also being studied for its use as a treatment for prostate cancer.

Source: Curcumin Helps Improve Immune Function, Life Extension Foundation, August, 2012.