Swanson Vitamins was established in 1969, located in North Dakota, the United States, after nearly 50 years of development, Swanson Swanson has become one of the largest health care products manufacturers in the United States, focusing on natural health products, its health products have 19 series, up to more than 2,000 products, vitamins and Its health products have 19 series and more than 2,000 products, vitamins and minerals have reached the USP (United States Pharmacopoeia) level of quality, which is the highest quality level of health products, and only a very few health product manufacturers in the United States have been awarded this level!