Because of their small size, nanoparticles can to go places in the body that larger particles cannot. Nanoparticles in food or food packaging can gain access via ingestion, inhalation, or skin penetration. Once inside our bodies, nanoparticles can penetrate cell walls and pass into the blood and lymph system. From there, the particles can circulate through the body and reach potentially sensitive target sites such as bone marrow, lymph nodes, the spleen, the liver, the heart, and cross the blood brain barrier. This unregulated new technology is clearly entering our food supply. There has been little if any safety testing, and there is no transparency of what products it is in. As we learned from a recent survey of 2,500 food companies, many companies may not even know that they have nanomaterials in their supply chain.