Zhejiang Brothers Pharmaceutical

Brothers Enterprises Holding, often referred to as Zhejiang Brothers Pharmaceutical in its pharmaceutical contexts, is a prominent Chinese manufacturer specializing in vitamins, pharmaceutical intermediates, and fine chemicals. The company is one of the world's largest producers of Vitamin K3 and a significant global supplier of Vitamin B1, Vitamin B3 (Niacin/Nicotinamide), and Vitamin B5. Beyond nutrition, the company operates in the pharmaceutical sector by producing active pharmaceutical ingredients (APIs) and intermediates, as well as leather chemicals and wood protection products. Headquartered in Haining, Zhejiang, the company is vertically integrated, maintaining large-scale manufacturing facilities that adhere to international quality standards such as GMP and ISO.