Bamboo can be used for paper, building materials, books and textiles. Being far more renewable than wood, bamboo can be grown in vast quantities in a fraction of time it takes to grow a single tree. Young bamboo shoots are also used in food and extracts of the plant are taken for their high silica content. Silica is beneficial externally and internally for hair and skin. Bamboo is thought to come from China but is now grown ornamentally throughout the world.