Scientists have produced a tomato enriched in the Parkinson’s disease drug L-DOPA in what could become a new, affordable source of one of the world’s essential medicines. The development of the genetically modified (GM) tomato has implications for developing nations where access to pharmaceutical drugs is restricted. This novel use of tomato plants as a natural source of L-DOPA also offers benefits for people who suffer adverse effects – including nausea and behavioural complications – of chemically synthesised L-DOPA . Tomato was chosen as a widely cultivated crop that can be used for scaled-up production and potentially offering a standardised and controlled natural source of L-DOPA.