Mercury is used as a preservative (e.g., thimerosal) in medical preparations such as vaccines (influenza, hepatitis B, DPT), ointments (ear medicines, hemorrhoid medication), contact-lens solutions and nasal sprays. It is also used in some medical equipment including thermometers, barometers, thermostats and manometers, etc. Mercury forms alloys with most metals and it is an excellent conductor of electricity. It is not soluble in water or most other liquids, but dissolves in lipids (fats and oils). Mercury also accumulates in the body. Mercury is an element that cannot be destroyed; therefore, mercury already in use can be recycled for other essential uses. Cooking of food containing mercury does not eliminate it.