There have been many advances in Vitamin C technology over the years and one of these was the development of the Advance+ form of Vitamin C which no longer requires a pH below 3.5. In fact, the Advance+ Vitamin C is compatible with a wide pH range between 2 and 11. There are many additional advantages of the Advance+ Vitamin C. One should always examine the clinical studies that have been performed on the finished product to determine that the product works as it should, regardless of the pH.