100% Kosher A Dietary Supplement Larix is the water soluble, long branched arabinogalactan (a type of polysaccharide) from the Western Larch Tree (Larix occidentalis). This high molecular weight compound (main fractions of 16,000 & 100,000MW) is similar to immune modulating arabinogalactans found in Echinacea. Larix is a non-toxic soluble dietary fiber.Eclectic Institute