The low cost of production makes plants an ideal candidate for producing many high value compounds through genetic engineering. Expression of vaccines, therapeutic proteins, nutraceuticals, industrial enzymes, and other bio-polymers has been achieved in different plants. A few products for human health care that have been produced in plant systems are currently undergoing human clinical trials. Some recombinant molecules produced in plants for diagnostic use are currently available in the market and several other compounds are in the pipeline for commercialization. The involvement of several biotechnology companies and the successes achieved provide promise for the growth of this emerging field, “Molecular Farming”.