Hydroquinone is now available by prescription only, so we recently reformulated the serum to use Synovea, which has several benefits. For most people, Synovea is as effective as hydroquinone, and is up to four times as effective for some individuals. It also is gentler on the skin than hydroquinone, and can be used continuously without taking a break like our old formula. While we loved our old serum, and know it made a huge difference to thousands of our customers, we are proud to offer an excellent product that still meets our customer’s needs, while making sure that we also meet all the new regulations surrounding hydroquinone.