Procyanidin impurities refer to the various byproducts and contaminants that can be present in procyanidin extracts. These impurities can affect the purity and potency of the procyanidins and may also have negative effects on their safety and efficacy. It is important to carefully monitor and control procyanidin impurities in order to ensure that these compounds are safe and effective for use in dietary supplements and other applications.
