Arabinogalactan: While Arabinogalactan and its constituent parts are common in nature, the commercial extraction is taken from a Larch tree. It is a water soluble fiber and supports immune competence. Arabinogalactan is a long chain polysaccharides containing arabinose and galactose mono-saccharides. Arabinogalactan is actively fermented by intestinal micro-flora and is effective at increasing beneficial anaerobes such as those in Pet Flora.