, May 13 -- Several American companies are expanding their operations in China, highlighting continued confidence in the country's large consumer market, strong manufacturing base and long-term business opportunities.

Essential oils company doTERRA announced in March that it will build new manufacturing facilities in Shanghai. The project will add to the company's existing China headquarters and research and development centre in the city.

The new facilities are expected to improve supply chain efficiency and help the company create a fully integrated operation covering research, production and sales.

Owen Messick, president of doTERRA China, said the investment reflects the company's confidence in China and will help combine its innov...