Lady's Thistle (Milk Thistle) Extract Best Antioxidant Anti-Ageing Dark Spot Fading Evens Skin Tone Lady's Thistle (Milk Thistle) Extract description Also known as milk thistle, this extract has a great deal of research showing it has many applications, owing to the skin-soothing, restorative, and antioxidant effects of its main chemical seed constituent, silymarin.