Once widespread, Agarikon (Fomitopsis officinalis) was known in ancient Greece as 'elixirium ad longam vitam', the 'elixir of long life'. Agarikon is now extremely rare, surviving in the old growth forests of the Pacific Northwest. Fungi Perfecti has focused on building an extensive culture library to preserve this species.

Host Defense® Agarikon Capsules use activated, freeze-dried, Certified Organic mycelium, with a full spectrum of constituents: polysaccharides (beta glucans, arabinoxylane, glucose, xylose, galactose and mannose), glycoproteins, ergosterols, triterpenoids and other myco-nutrients, which are essential for Supporting Natural Immunity.