Aloin is extracted from the leaves of aloe vera. Aloin, also called barbaloin, is a yellow brown (Aloin 10%, 20%, 60%) or light yelow green (Aloin 90%) powder with bitter taste. Aloin powder is easily soluble in organic solvent, and slightly soluble in water. Aloin is produced from fresh aloe leaves through juicing, colloid milling, centrifugal filtration, concentration, enzymolysis and purification. Aloin is mainly used for improving immunity, inhibiting bacteria, protecting liver and skin.