I've been doing daily small amounts of rice bran, although I just bought some wheat bran too. But I am afraid to feed more than about 1 cup per day, because I have no idea how much is too much, but I am pretty sure I am safe at such a low amount. Plus I am feeding alfalfa, so I know they are getting lots of calcium.
But my guys have wonderful coats with the rice bran.
I have never had bad experiences with wheat, just a lot of folks telling me it's bad. So I don't know. I know you would not want to feed lots of any kind of bran without also making sure they are getting adequate calcium. But beyond that, I don't know much.
PS. I identified you as an Arizona horse owner on your other post just based on what you said you were feeding, lol! I don't think I have ever even seen Timothy. I wouldn't be able to identify it!