I have used Gobal Herbs calmers on my horse, 3 different ones so far! First of all i bought Stresscare and used that alongside Magnitude and it worked brilliantly and turned him into a different horse.
Then I went to buy some more but they don't do it anymore so I bought Supercalm which is exactly the same, think they just changed the name of it.
Then I ran out of that but when I went to get some more they didn't have any so I bought the TB calmer instead (I have an Arab x TB x Hanovarian) it has the same ingredients in it plus something else.
So far he is still chilled out and I'm happy that it's working.