I tried SmartPak's SmartDark & Handsome. It didn't work for my horse. She still faded. And she didn't like it. (But she is so finkey with ger grain/oils/supplements!) I'm going to try something else this year.
Any "darkening" supplement has to be fed when the new hair is coming in. So you need to start feeding it before they start shedding their winter coat. Otherwise once the new hair is in...It's not going to darken it back up. For me, It's early March that I have to start feeding Paprika or the SmartPak SD&H.
"The greatest pleasure of a dog is that you may make a fool of yourself with
him and not only will he not scold you, but he will make a fool of himself too."