Hangzhou Regin Bio-tech Co.,Ltd. - founded in 1989, is one of the biggest & oldest manufacturer of tartaric acid series products in China. So far, we have a history more than 30 years. Our main products include DL- Tartaric Acid, L(+)-Tartaric Acid, Potassium Sodium Tartrate, Potassium Bitartrate, etc. Our products h...