Deep within the nervous system lies a family of molecules with the power to protect, repair, and regenerate the brain, and the nerve growth factor (NGF) may hold the key to some of medicine’s most urgent unsolved problems. First identified through the Nobel Prize-winning work of Rita Levi-Montalcini and Stanley Cohen, NGF and its neurotrophin family are now at the centre of a global scientific push to find treatments for Parkinson’s disease, Alzheimer’s disease, and traumatic brain injury, conditions affecting hundreds of millions of people worldwide for which no cure yet exists. The Brain Keepers takes viewers inside the laboratories and minds of the researchers driving this frontier, exploring how neurotrophin science is reshaping our understanding of neurodegeneration, what breakthroughs are within reach, and what still stands in the way. A field born from one extraordinary discovery is now on the threshold of changing medicine forever.