Yes, I have fed camomile I bought from Natural Horse Supplies on E Bay. Yes, it does work but I read somewhere that you should only feed it for 2 to 3 months and then have a break as there are toxins in it like a lot of plants I think.
I give mine a slosh of chamomile tea over their feed prior to very stressful events, then I drink the rest myself. It calms me anyhow, but I don't think this is what you mean!
