I tried Valerian in water, don't really know if it made much difference or not as it was used in conjunction with removing her from the situations which were making her hyper.
I have never used one. One of my dogs is very hyper and excitable. He has lots of exercise, play time, company, and a good diet. (recommended by vet) He is just a hyper dog and gets anxious. He recently lost a bit of weight, he is always on the go, never sits still. Have increased his food, he is regularly wormed and seems very healthy just a bit of weight loss. I have moved house about 2 months ago so I am hoping it might be this. He is a rescue and suffered with separation anxiety when I got him, which I have overcome. He just a real sensitive boy. Wondered what peoples experience of Calmer were. I wouldn't use anything with out consulting my vet first anyway, just general interest.