Shanghai Doroe Biotechnology Co., Ltd is a young & energetic company, specializing in L/DL-Amino Acids (Up to AJI92, USP24, and FCC4), which have been exported to many countries. Now, we strive to develop more products with high quality & competitive price for the benefit of all mankind. L-Pyroglutamic Acid is our one strong item. We can supply it with stable quality, but at competitive price.