Horsetail tea is rich in minerals and silica, making it a natural choice for enhancing healthy hair, nails, bones, and teeth. Many people turn to horsetail tea as a drink or a hair rinse to increase hair volume and growth. This mild flavored tea's nutritional profile will strengthen your body and enhance your beauty from the inside out, while providing the muscles and brain with the minerals they need to function at peak levels. Equisetum arvense is the Latin botanical name for Horsetail, or Shavegrass Herb. It is also refered to as Cola de Caballo, bottle brush, equisetum or scouring rush. Horsetail contains silica, calcium and potassium in addition to other micronutrients.