The anti-ageing properties of the botulinum toxin (sold as Botox and Dysport) are likely behind many a well-preserved face in Hollywood, and can be found closer to home, too. When injected, Botox relaxes muscles, preventing skin from creasing and causing wrinkles. It’s effective for “expression lines”, such as frown and surprise lines on the forehead and crow’s feet around the eyes, and “turkey neck” – lines on the throat.