Neiyaku Kagaku

Neiyaku Kagaku (Neiyaku Chemical Industry) is a Japanese pharmaceutical company headquartered in Nara, Japan, specializing in the development, manufacturing, and contract manufacturing (OEM/ODM) of over-the-counter (OTC) drugs, quasi-drugs, and health supplements. Founded in 1940, the company produces a wide range of solid dosage products, including vitamins, Kampo (traditional herbal) medicines, and consumer healthcare products such as Ryoushin JV tablets for joint pain and Kimie White for skin spots. Neiyaku Kagaku operates GMP-compliant manufacturing facilities, including its main factory in Yamatotakada and the newly completed Shinjo packaging plant in Katsuragi, which was completed in 2026. The company provides comprehensive services from product planning and formulation development to raw material purification, tableting, coating, and packaging.