Nestle SA, the world's largest food company by revenue, has expanded into the Chinese market's health food secto r by introducing a protein powder believed to have great sales-growth potential.

Nestle Yiyang Protein Powder, which was unveiled in Beijing on Monday, will be introduced in seven large cities - Beijing, Tianjin , Shanghai , Xi'an, Qingdao, Hangzhou and Nanjing. Industry experts said the Chinese metropolises are the best-selling areas for light food where people have more money and pay more attention to health.

"I am confident about this product," said Roland Decorvet, CEO of Nestle China. "China is not the oldest country in the world, but it is a fast-aging one. I believe the market (for health food) will be very strong."

The Chinese health food market reached 105 billion yuan ($16.87 billion) in 2011, with an annual increase of 11.4 percent since 2006, said the State Food and Drug Administration.

According to the administration, China in 2011 approved the registration of 813 new health food products, a year-on-year increase of 14.5 percent.

By 2015, the health food market in China will hit 450 billion yuan, said Hong Kong Trade Development Council, the international marketing arm for Hong Kong-based traders, manufacturers and service providers.

Nestle said the protein powder was researched, developed and launched in China, but raw materials for the product come from Switzerland and New Zealand.

According to the General Administration of Customs , health food imports reached 203 million yuan in 2010, a year-on-year increase of more than 30 percent. And sales of foreign health food products have maintained an annual increase of 12 percent.

US direct-selling giant Amway Corp said earlier that China has been its largest market for nine straight years. Sales revenue in the country reached 26.7 billion yuan in 2011, with its core health food brand, Nutrilite, accounting for nearly half of all the company's business.

According to Beijing-based S&P Consulting, China's per capita spending on health food is $31 per year, which accounted for 0.07 percent of their total annual consumption. By contrast, the figure in the United States and the Europe an Union is around 2 percent, which is 29 times the Chinese level.

"Chinese consumers are likely to try Yiyang as Nestle's good quality and good science ," said Alessandre Keller, vice-president of Dairy Business Unit of Nestle China's Food & Beverage Division. "Of course, there will be more Yiyang products in China, so just stay tuned."