PerformancePerformance enhancing feed supplementsare very much horse specific. Each horse is an individual and needs assessing. Some horses need calming down, so a calming supplement would be used such as Horse First Relax Me, or Prosportive Chill. Other horses may need a boost such as Prosportive Provide or Red Cell. Most horses are fed on a feed supplement for joints such as Horse First Keep me Sound, or Prosportive Triflex.