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Xi'an Prius biologicalEngineeringCo.Ltd is a high-tech export-oriented enterprise which is the combination of Research, development, production and sales, it has been devoted to providing high -quality Health care raw material, cosmetic raw material, herbal extract and food additives, for the clients. Our products including akba boswellic acid, carnosic acid price, glucosamine sulfate and chondroitin sulfate, etc. Tannic acid astringent is in a class of chemicals called tannins, which are found in many plants. Tannic acid refers to tannins that can be dissolved in water, as opposed to the other type, or condensed tannins. Lutein eye complex can protect the eyes from light damage, slow aging and prevent diseases of the eye. http://www.prius-biotech.com/