The success of Omega 3 enriched eggs and water with fluoride has led to Pharming. This is the process of growing and harvesting plants that have been genetically engineered with foreign DNA to make them produce medicine - or proteins which can be purified to produce medicine - at a fraction of the price of conventional manufacture. Scientists are currently growing plants with genetic instructions to make drugs for the treatment of diseases such as HIV, rabies and Hepatitis B, as well as crucial dietary supplements. Some drug products and nutrients may be able to be delivered directly by eating the plant or drinking the milk. Such technology has the potential to produce large quantities of cheap vaccines, or other important pharmaceutical products such as insulin.