Beryllium is used in aerospace (altimeters, braking systems, engines, precision tools, solid propellant additives, satellite optical system mirror components, gyroscopes), automotive (air bag sensors, antilock systems, steering linkage springs), biomedicine (dental crowns, medical laser components, X-ray tube windows), defense (heat shields, missile guidance systems, nuclear reactor components, advanced surveillance satellites, and radar systems), energy and electronics (heat exchanger tubes, microwave devices, relays and switches), fire prevention (non-sparking tools in oil exploration equipment, sprinkler system springs), consumer products (camera shutters, computer disks, pencil clips), production of plastics (plastic injection molds), sporting goods (golf clubs, fishing rods, natural and artificial precious stones), and telecommunications (components for mobile phones, electronic and electrical connectors, housings for underwater repeaters). Beryllium oxide is suitable for the production or protection of materials used at high temperatures in corrosive environments (it has ceramic properties). Beryllium and beryllium compounds cause cancerous diseases. Beryllium was detected in granulomas associated with chronic beryllium disease in exposed workers for several years. This indicates that beryllium is retained in granulomatous lesions for a long period of time in exposed humans. Inflammatory processes associated with the development of acute or chronic beryllium disease contribute to the development of lung cancer.  In analytical papers, no one mentions metabolites, but they are determined as elements after destroying samples and releasing them from complexes with proteins where they are bound.