Plankton, specifically marine phytoplankton such as Nannochloropsis and Tetraselmis species, have garnered scientific interest for their potential neuroprotective effects due to their rich content of omega-3 fatty acids (especially EPA and DHA), antioxidants, vitamins, and minerals. Omega-3 fatty acids are essential for maintaining neuronal membrane integrity and function, and deficiencies have been linked to cognitive decline and neurodegenerative diseases. While most studies focus on fish oil as a source of omega-3s, marine phytoplankton are a primary producer of these nutrients in the aquatic food chain, and recent research has investigated their direct supplementation in animal models and in vitro studies.

Some in vitro and animal studies have shown that extracts from marine phytoplankton can reduce oxidative stress and inflammation—both implicated in nervous system disorders. However, human clinical trials directly linking whole plankton supplementation to improved nervous system health are limited and preliminary. Most human data extrapolates from the known benefits of omega-3 fatty acids, rather than from the use of whole plankton itself.

In conclusion, the scientific rationale for using plankton to support the nervous system is based on its nutrient profile and early preclinical evidence, but robust clinical validation is currently lacking. The evidence supports a modest rating due to promising mechanisms but limited direct clinical research.