I can ask the people that work at mills around here know nothing about horses and are no help in what things are. I can check this friday and see what they have, I don't need it till mid winter so I have some time to look around.
Hi, don't know what 'mannas pro flax thing' is, but flax/linseed is a good source of omega 3s & essential fatties, which is good for coat & hooves. You can either feed the ground seeds or cold pressed oil. But it loses a lot of it's value quickly after processing, especially in sunlight & heat. Therefore if you buy the oil, make sure it's in a lightproof container & kept cool, or feeding the whole seeds, grind them fresh daily.
Well balanced nutrition makes a horse less susceptible to bleaching and I think it's copper from memory that's particularly important for pigment. Therefore if your horse is prone to bleaching, I'd want to do a diet analysis & work out what he's deficient/imbalanced in.
I scored big on flaxseed today. I add it to my oldest's mash through winter, a 50 lb bag of meal is pretty pricey. I was at whole foods for a human trip and like most ended up being a horse trip lol! I bought whole organic flax in their bulk bins for .69/lb. It will be a little work to run it through the coffee grinder, but worth the savings :)