I've been feeding my palli paprika for about a year or so, and i've noticed a big improvement on her summer coat this year. I've been refining what i feed her a bit, and i think i've got it down now.
She gets about a tablespoon of paprika, 3 or 4 carrots and a "scoop" of lucerne twice a day (plus 2 scoops of chaff) and whatever greenery is in the paddock.
The price of paprika is not too bad but its certainly not cheap, so i buy it in bulk from cash n carry. but the stuff in 500g or so jars from coles it fairly cheap too. And the carrots i feed her are just juicing ones so its $10 for a 20kg bag.
While she's still got her winter coat on her belly i'll post a photo of her on here for you to see the change in her coats. (when i get home that is
As for what Lexie said about the paprika showing up in some tests, (and this is according to the internet) the amount of whatever the drug is in paprika is so small that you would have to be feeding your horse something like 500g per week for it to show up. which is significantly less than 14 tablespoons. But as with any info you find on the net, that has to be taken with a pinch of salt. And i don't compete, so it doesn't bother me in the slightest!!
But as i said before, anything that is naturally "orangey" will do the trick if you can get your horse to eat it. Mine didn't want to know about pumpkin, but loves sausages, gravy, coffee, anzac biccies, tea, chamomile tea, ANYTHING with flour in it, and all sorts of other things that she's not supposed to get into!!