General：In China, immature dried fruit of citrus aurantium is named Zhi Shi. It is a traditional medicine to maintain stomach and gastrointestinal health and to improve circulation and liver function.Modern pharmacology researches show that synephrine, derived from citrus aurantium, is known to stimulate (via adrenergic activity) fat metabolism.It is developed as weight loss diet in the marketplace. Although it is chemically very similar to ephedrine, Zhi Shi does not appear to have the same negative central nervious effects of Ma Huang (ephedra), Through its stimulation of specific adrenergic receptors (beta-3,but not beta-1,beta-2 or alpha-1), Zhi Shi is theorized to stimulate fat metabolism without the negative cardiovascular side effects experienced by some people with Ma Huang (which stimulates all beta-adrenergic receptors). Currently, some formulas containing Ma Huang (ephedrine) have been reported severe injury or death in some people who consume them. The safety of weight loss products troubles consumers. The natural products industry is in need of a new weight loss/fitness ingredient. Zhi Shi, a safe and effective substitute, is increasingly expanding market share. New preparations and specifications are developed continually to meet the different demand of customers. Appearance：Brown yellow powder。 Specification：(1)Regular Citrus Aurantium Extract : 6%,10%,30%Synephrine.(2)Water-Soluble & Debitterized Citrus Aurantium Extract:6%,10%,30%Synephrine.