Think it's prob one of the better ones as it has magnesium in it. I use this for a fizzy TB, worked for about 5 days, but then join up calmed her right down and prevented her spooking. She's been on it for 3 weeks now, but that still didn't prevent her spooking to a bird today when I got her in, barging past me from the field and legging it on her own back to the stable, with me minus a wellyboot running behind.
tried it and it didn't work!! for the past 2 yrs i've had my tb mare who was at times dangerous on magnitude by equine America! i'm not a fan of calmers but this one is awesome i would seriously recommend it!! it took away all the fear and stress but left my mares personality, she is so much happier on this!! i also use no more moods by equine America too to help control the temper tantrums!! both are very reasonably priced at £18.99 for 6 months and £29.99 for 2 months!! i will NEVER that my mare off either as i tried once and she went back to being a nightmare! i really hope this helps!!