2 years. River Luo Huaifu yam powder is Sun Shuwu personally developed, the main effect of River Luo Huaifu yam powder is to be able to strengthen the spleen and stomach, can fix the kidneys and benefit the essence, melt in the mouth, taste mellow is to 2 years of aging to manufacture out, in the market by many consumers recognized, the sale of heat has been very high.