Premier Performance Calming Cookies Mint. Keep your horse or pony calm during stressful situations with Premier Performance Calming Cookies. Perfect for taking the edge off horses in situations that may cause excitability or stress such as competitions, the farrier, for clipping, travelling or even hacking out or schooling. The Calming Cookie can be fed when required to help keep your horse calm and confident without reducing their performance. The active ingredient in Calming Cookies is L-Tyrosine which helps to produce Serotonin which is a natural mood stabilizer, or the feel good hormone. Along with L-Tyrosine, L-Arginne is also an active ingredient which converts to nitric oxide which helps to relax blood vessels and increase blood flow. Premier Performance Calming Cookies contains no fillers, binders or contain any substances prohibited by the FEI.