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Cognitive Support Dietary SupplementHelps Support Healthy Cognitive Functions Like Attention and Learning Brain-Health Formula For Maximizing Your Mental PowerScience-Backed Quality Since 1969Swanson NeuroSilk features fibroin a unique peptide found in silk. The Chinese have been breeding silkworms for silk production for more than 5 000 years and silkworm cocoons have been used for health purposes for nearly as long. In its raw state silk consists of two main proteins sericin and fibroin with a glue-like sericin layer surrounding tough central filaments made of fibroin.