Nutricost Vitamin C Powder is made in the USA and is lab tested for purity. Asorbic Acid (Vitamin C) is an essential vitamin to all of life. Vitamin C is an important factor in many of the body’s various life-giving and life-maintaining functions including the successful operation of the immune system. Unfortunately, Vitamin C is not water soluble and it’s not naturally produced by our bodies either. This means that although it is an essential vitamin, it must be replenished every day in order for good health to be maintained. Vitamin C can be found in pretty much all fruits and vegetables, but is especially abundant in citrus fruits. When Vitamin C is ingested into the body, it begins to circulate through all of the watery areas of the body and from there helps in the fortification of collagen and also acts as an antioxidant. Vitamin C is frequently used as a food additive along with other kinds of antioxidants like calcium salts, sodium, and potassium. Vitamin C also has a host of other general uses. It helps repair damaged tissue in your body, boosts your immune system, and helps in keeping a healthy levels of collagen.