New Roots Herbal Sterols & Sterolins with Arabinogalactan - Sterols and sterolins have been shown to modulate the functions of T cells by enhancing their cellular division and their secretion of important soluble factors called lymphokines. This is helpful for over active immunity such as rheumatoid arthritis, lupus, inflammation and sinus problems. Sterols and beta-sitosterols are able to help both under and over active immune systems because it is not an immune system stimulator but an immune-system modulator. This combination of sterols and beta-sitosterols is also vital because although sterols and beta-sitosterols both work on their own, they work far better together. They are also absorbed much more when together, but very poorly when found alone.