I used to be a devoted user of Cosmetic Skin Solutions CE serum that was a near dupe of Skinceuticals CE Ferulic. They stopped making it awhile ago and launched their Supreme Serum CE that they market as having a super low pH level. I didn’t want to try it because to me, super low means way way below a 3.0 and maybe even below 2.0 pH level. So I tested a sample of it and found the pH level to be pretty good. Here is the reading from my pH meter: