Monomer, a molecule of any of a class of compounds, mostly organic, that can react with other molecules to form very large molecules, or polymers. A standardized extract is created by "pulling out" (extracting) specific compounds from a plant. Standardized Saw Palmetto Berry Extract, for example, is extracted from the fresh berries of the saw palmetto tree. In many cases, standardized extracts are used in studies on herbs because the active ingredients can be monitored for consistency, whereas natural herb powders will vary.