Paul Stamets' Host Defense Extract combines the powerful immune stimulating effects of numerous therapeutically effective compounds from sixteen of our most powerful medicinal mushrooms.

Host Defense Extract for Travelers contains the five mushrooms which it's believed the Haida tribe used to stay healthy when other Native American tribes perished from Small Pox, Measles, and other diseases brought by the Europeans.

Host Defense Extract for Travelers comes in the form of a spray, which is convenient to carry and use frequently during travel to help boost the immune system during times of extra exposure to pathogens.  Many also use it at home and when they feel they are starting to come down with something.  (However, please seek medical advice as needed.)