Quy Nguyên is a Vietnamese company specializing in the production and distribution of traditional Vietnamese food products. It was founded by the Buddhist monk Thích Tuệ Hải, who serves as the abbot of Long Hương Pagoda in Đồng Nai Province. The company was officially registered in Ho Chi Minh City in April 2011. Its production activities are associated with Long Hương Pagoda in Nhơn Trạch District. The product range includes brown rice, brown rice products, fermented soy sauces, miso, sesame products, roasted rice tea, kudzu starch, and various plant-based blends. One of its best-known products is Tamari Nguyên Dương Trường Niên. This sauce is made from soybeans, sea salt, water, and a fermentation culture without added sugar or preservatives. Fermentation and maturation take more than three years and occur in containers exposed to sunlight. Quy Nguyên also produces a garlic-infused tamari and long-aged miso.